Acb abb

Emax
Installation instructions for PR122/P,
PR123/P releases and modules
Installation and service
instructions
1SDH000460R0102 L6555

L6555 Emax
ABB SACE
Doc. no.
Model Apparatus
Dwg. Title
App.
Resp. Off.
Take over Off.
Scale
Language
EN
1SDH000460R0102
Installation, service and maintenance
instructions for low voltage air
circuit-breakers
• READ THIS DOCUMENT AND THE INSTRUCTION MANUAL CAREFULLY BEFORE ATTEMPTING TO
INSTALL, OPERATE OR SERVICE THIS CIRCUIT BREAKER.
• File these instructions with other instruction books, drawings and descriptive data of the circuit brea-
ker.
• Keep this documents available for the installation, operation and maintenance about this equipment.
Use of these instructions will facilitate proper maintenance of the equipment.
• Install the Circuit breaker within the design limitations as described in the Installation instructions
shipped with the circuit breaker. These circuit breakers are designed to operate within the current and
voltage limitations on the switch nameplate. Do not apply these switches to systems with current and/
or voltages that exceed these limits.
• Follow your company’s safety procedures.
• Do not remove covers, open doors or work on equipment unless power has been turned off and
all circuits de-energized, and after making sure of that with a measuring instrument.
WARNING:
• Detailed descriptions of standard repair procedures, safety principles and service operations are not
included. It is important to note that this documents contain warnings and cautions against certain
specific service methods that could cause personal injury to service personnel, damage equipment,
or render it unsafe. These warnings do not cover all conceivable ways in which service, whether or not
recommended by ABB, might be performed, or the possible hazardous consequences of each concei-
vable way, nor could ABB investigate all such ways.
• Anyone using service procedures or tools, whether or not recommended by ABB, must satisfy himself
thoroughly that neither personal safety, nor equipment safety, will be jeopardized by the service me-
thod or tools selected. Should further information be required or specific problems arise that are not
sufficiently covered, refer the matter to an ABB service representative.
• This publication is written only for qualified persons and is not intended to be a substitute for adequate
training and experience in the safety procedures for this device.
• The purchaser, installer or ultimate user is responsible for ensuring that warning signs are attached
and all access doors and operating handles are securely locked when the gear is left unattended, even
momentarily.
• All information contained in this document is based on the latest product information available at the
time of printing. We reserve the right to make changes at any time and without prior notice.

Index
1. Protection releases - General notes. . . . . . . . . . . 5
1.1. Safety Notes. . . . . . . . . . . . . . . . . . . . . . . 6
1.1.1. Notes for dielectric stiffness tests . . . . . . . . . . . . 6
1.2. Abbreviations and notes. . . . . . . . . . . . . . . . . 6
1.2.1. Abbrevations. . . . . . . . . . . . . . . . . . . . . . . 6
2. SACE PR122/P and PR123/P relays . . . . . . . . . . 7
2.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 7
2.2. Identification . . . . . . . . . . . . . . . . . . . . . . . 7
2.3. Specifications . . . . . . . . . . . . . . . . . . . . . . 7
2.3.1. General characteristics . . . . . . . . . . . . . . . . . 7
2.3.2. CB compatibility . . . . . . . . . . . . . . . . . . . . . 8
2.3.3. Standards . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3.4. Environmental characteristics . . . . . . . . . . . . . . 8
2.3.5. Electrical characteristics. . . . . . . . . . . . . . . . . 9
2.3.5.1. Primary current . . . . . . . . . . . . . . . . . . . . . 9
2.3.5.2. Power supply . . . . . . . . . . . . . . . . . . . . . . 9
2.3.5.3. Operating mode . . . . . . . . . . . . . . . . . . . . . 9
2.4. User interface . . . . . . . . . . . . . . . . . . . . . 10
2.4.1. LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4.2. Push-buttons . . . . . . . . . . . . . . . . . . . . . 11
2.4.3. Display. . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4.3.1. Graphic ammeter and voltmeter. . . . . . . . . . . . 12
2.4.3.2. CB and relay alarms. . . . . . . . . . . . . . . . . . 12
2.4.3.3. Operating icons . . . . . . . . . . . . . . . . . . . . 13
2.4.4. Rating Plug . . . . . . . . . . . . . . . . . . . . . . 14
2.4.5. External connections . . . . . . . . . . . . . . . . . 14
2.4.5.1. Test connector. . . . . . . . . . . . . . . . . . . . . 14
2.4.5.2. Internal modules. . . . . . . . . . . . . . . . . . . . 14
2.4.5.3. External sensors. . . . . . . . . . . . . . . . . . . . 14
2.4.5.4. Power supply of Vaux, Zone Selectivity and fixed
external accessories. . . . . . . . . . . . . . . . . . 14
2.5. User menus . . . . . . . . . . . . . . . . . . . . . . 14
2.5.1. Measurements Area. . . . . . . . . . . . . . . . . . 14
2.5.2. Information Pages . . . . . . . . . . . . . . . . . . . 14
2.5.3. Menu Area. . . . . . . . . . . . . . . . . . . . . . . 15
2.5.3.1. Menu browsing . . . . . . . . . . . . . . . . . . . . 15
2.6. Protection functions . . . . . . . . . . . . . . . . . . 15
2.6.1. Notes about Protection Operation. . . . . . . . . . . 16
2.6.2. Protection L . . . . . . . . . . . . . . . . . . . . . . 16
2.6.2.1. Thermal memory L . . . . . . . . . . . . . . . . . . 17
2.6.3. Protection S . . . . . . . . . . . . . . . . . . . . . . 17
2.6.3.1. Thermal memory S . . . . . . . . . . . . . . . . . . 17
2.6.3.2. Start-up threshold S . . . . . . . . . . . . . . . . . 17
2.6.3.3. Zone S selectivity . . . . . . . . . . . . . . . . . . . 18
2.6.4. Protection S2 . . . . . . . . . . . . . . . . . . . . . 18
2.6.5. Directional protection D . . . . . . . . . . . . . . . . 18
2.6.5.1. Start-up threshold D . . . . . . . . . . . . . . . . . . 19
2.6.5.2. (Directional) zone selectivity D . . . . . . . . . . . . 19
2.6.6. Protection "I". . . . . . . . . . . . . . . . . . . . . . 20
2.6.6.1. Start-up threshold "I" . . . . . . . . . . . . . . . . . 20
2.6.7. Protection against closing on short-circuit “MCR” . . . 20
2.6.8. Protection “G” . . . . . . . . . . . . . . . . . . . . . 21
2.6.8.1. Zone selectivity “G” . . . . . . . . . . . . . . . . . . 21
2.6.8.2. Zone selectivity “G” . . . . . . . . . . . . . . . . . . 21
2.6.9. Protection "Gext" . . . . . . . . . . . . . . . . . . . 21
2.6.9.1. Start-up threshold “Gext" . . . . . . . . . . . . . . . 21
2.6.9.2. Zone selectivity “Gext". . . . . . . . . . . . . . . . . 21
2.6.10. Protection Gext (Idn) / Residual current protection Rc 22
2.6.11. Protection "U" . . . . . . . . . . . . . . . . . . . . . 22
2.6.12. Protection “UV” . . . . . . . . . . . . . . . . . . . . 23
2.6.13. Protection "OV" . . . . . . . . . . . . . . . . . . . . 23
2.6.14. Protection "RV" . . . . . . . . . . . . . . . . . . . . 23
2.6.15. Protection "RP" . . . . . . . . . . . . . . . . . . . . 23
2.6.16. Protection "UF" and "OF" . . . . . . . . . . . . . . . 23
2.6.17. Protection "T" . . . . . . . . . . . . . . . . . . . . . 23
2.6.18. Load control function . . . . . . . . . . . . . . . . . 24
2.6.19. Double protection set . . . . . . . . . . . . . . . . . 24
2.6.20. Neutral Protection . . . . . . . . . . . . . . . . . . . 24
2.6.21. Protection against instantaneous short-circuit “Iinst” . 25
2.6.22. Summary table of the protection function settings for
PR122 and PR123/P . . . . . . . . . . . . . . . . . 25
2.6.23. Trip curves. . . . . . . . . . . . . . . . . . . . . . . 27
2.6.23.1. Trip curves for functions L-I . . . . . . . . . . . . . . 27
2.6.23.2. Trip curves for functions L-S(t=k/I2
)-I . . . . . . . . . 27
2.6.23.3. Trip curves for functions L-S(t=k)-I . . . . . . . . . . 28
2.6.23.4. Trip curves for function L in accordance with
IEC 60255-3 (type A) . . . . . . . . . . . . . . . . . 28
IEC 60255-3 (type B) . . . . . . . . . . . . . . . . . 29
IEC 60255-3 (type C) . . . . . . . . . . . . . . . . . 29
2.6.23.7. Trip curves for function G . . . . . . . . . . . . . . . 30
2.6.23.8. Trip curves for function D . . . . . . . . . . . . . . . 30
2.6.23.9. Trip curves for function U . . . . . . . . . . . . . . . 31
2.6.23.10. Trip curves for function UV . . . . . . . . . . . . . . 31
2.6.23.11. Trip curves for function OV . . . . . . . . . . . . . . 32
2.6.23.12. Trip curves for function RV . . . . . . . . . . . . . . 32
2.6.23.13. Trip curves for function RP . . . . . . . . . . . . . . 33
2.7. Measuring functions . . . . . . . . . . . . . . . . . . 33
2.7.1. Runtime measurements: current, voltage, power . . . 34
2.7.2. Trip. . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.7.3. Events . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.7.4. Measurements Log register . . . . . . . . . . . . . . 35
2.7.5. Power factor . . . . . . . . . . . . . . . . . . . . . . 35
2.7.6. Energy. . . . . . . . . . . . . . . . . . . . . . . . . 35
2.7.7. Peak factor. . . . . . . . . . . . . . . . . . . . . . . 35
2.7.8. Mains frequency. . . . . . . . . . . . . . . . . . . . 36
2.7.9. Contact wear . . . . . . . . . . . . . . . . . . . . . 36
2.7.10. Wave forms . . . . . . . . . . . . . . . . . . . . . . 36
2.8. Main functions . . . . . . . . . . . . . . . . . . . . . 36
2.8.1. Watchdog . . . . . . . . . . . . . . . . . . . . . . . 36
2.8.2. Circuit-breaker state . . . . . . . . . . . . . . . . . . 36
2.8.3. Datalogger. . . . . . . . . . . . . . . . . . . . . . . 36
2.8.3.1. Settings . . . . . . . . . . . . . . . . . . . . . . . . 37
2.8.3.2. Recording time windows. . . . . . . . . . . . . . . . 37
2.8.3.3. Access to saved data from the system . . . . . . . . 38
2.8.3.4. Example of data logger operation . . . . . . . . . . . 39
2.8.4. Zone selectivity . . . . . . . . . . . . . . . . . . . . 39
2.9. Settings Menu . . . . . . . . . . . . . . . . . . . . . 39
2.9.1. Circuit-breaker. . . . . . . . . . . . . . . . . . . . . 40
2.9.2. Network frequency . . . . . . . . . . . . . . . . . . 40
2.9.3. Modules . . . . . . . . . . . . . . . . . . . . . . . . 40
2.9.4. Datalogger. . . . . . . . . . . . . . . . . . . . . . . 40
2.9.5. Dual Set . . . . . . . . . . . . . . . . . . . . . . . . 40
2.9.6. Measurement Interval . . . . . . . . . . . . . . . . . 40
2.9.7. Harmonic distortion . . . . . . . . . . . . . . . . . . 40
2.9.8. System . . . . . . . . . . . . . . . . . . . . . . . . 40
2.9.8.1. Language . . . . . . . . . . . . . . . . . . . . . . . 40
2.9.8.2. Password . . . . . . . . . . . . . . . . . . . . . . . 40
2.9.9. Display contrast . . . . . . . . . . . . . . . . . . . . 40
2.10. Test Menu . . . . . . . . . . . . . . . . . . . . . . . 41
2.10.1. Autotest . . . . . . . . . . . . . . . . . . . . . . . . 41
2.10.2. Trip test . . . . . . . . . . . . . . . . . . . . . . . . 41
2.10.3. Rc Test. . . . . . . . . . . . . . . . . . . . . . . . . 41
2.10.4. Zone selectivity . . . . . . . . . . . . . . . . . . . . 41
2.10.5. COM module . . . . . . . . . . . . . . . . . . . . . 41
2.10.6. SIGNALLING module . . . . . . . . . . . . . . . . . 42
2.11. Internal modules. . . . . . . . . . . . . . . . . . . . 42
2.11.1. PR120/V - MEASURING Module . . . . . . . . . . . 42
2.11.1.1. Power supply . . . . . . . . . . . . . . . . . . . . . 42
2.11.1.2. PR120/V parameters . . . . . . . . . . . . . . . . . 42
2.11.1.3. Voltage transformer . . . . . . . . . . . . . . . . . . 43
2.11.1.4. Dielectric strength tests . . . . . . . . . . . . . . . . 44
2.11.2. Module PR120/D-M - COM . . . . . . . . . . . . . . 44
2.11.2.1. PR120/D-M parameters . . . . . . . . . . . . . . . . 44
2.11.3. Module PR120/K - SIGNALLING . . . . . . . . . . . 45
2.11.3.1. PR120/K parameters . . . . . . . . . . . . . . . . . 45
2.11.3.2. Characteristics of the signalling contacts . . . . . . . 46
2.11.3.3. Digital input . . . . . . . . . . . . . . . . . . . . . . 46
2.11.4. Module PR120/D-BT - WL COM . . . . . . . . . . . 46
2.12. Putting into service and recommendations . . . . . . 47
2.12.1. Installation . . . . . . . . . . . . . . . . . . . . . . . 47
2.12.2. Uninstalling . . . . . . . . . . . . . . . . . . . . . . 47
2.12.3. Connections . . . . . . . . . . . . . . . . . . . . . . 47
2.12.4. CS and TC connection test . . . . . . . . . . . . . . 47
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2.12.5. Current sensor connection for external neutral . . . . 47
2.12.6. TV connections . . . . . . . . . . . . . . . . . . . . 47
2.12.7. How to put the Rc sensor into service. . . . . . . . . 47
2.13. Default settings . . . . . . . . . . . . . . . . . . . . 48
2.14. Troubleshooting . . . . . . . . . . . . . . . . . . . . 49
2.14.1. Troubleshooting . . . . . . . . . . . . . . . . . . . . 49
2.14.2. In the case of a fault . . . . . . . . . . . . . . . . . . 50
2.15. External units . . . . . . . . . . . . . . . . . . . . . 50
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1. Protection releases - General notes
The ABB SACE Emax series of air circuit-breakers can be equipped with electronic relays PR122/P and PR123/P.
Every operational requirement is available thanks to the different performance levels of the relays, the additional modules that
can be fitted inside them (PR120/V, PR120/K, PR120/D-M, PR120/D-BT) and other external accessories.
The functions and accessories available with the 2 relays are listed in the table below.
Function/Unit PR122 PR123
Current protections (L, S, I, G) S S
Additional protections (U, OT) S S
Voltage protections (UV, OV, RV, RP, UF, OF) S(4)
S
Other protections (D, S2, Double protection G) - S
Harmonics analysis - S
Temperature protection S S
MCR Protection S S
Thermal memory S S
Residual current protection O O
Data Logger S S
Dual setting - S
Front connector for test unit and temporary power supply S S
Compatibility with Ekip Connect S S
Local bus for external accessory units S S
System bus for cable communication O(2)
O(2)
Bluetooth wireless communication O(3)
O(3)
PR120/V Measuring (internal voltages module) O S
PR120/K Signalling (internal signalling module) O O
PR120/D-M (Internal module for cable communication) O O
PR120/D-BT (Internal module for communication via Bluetooth) O O
HMI030 (Display via switchgear for ABB SACE relay) O O
Flex Interface (External signalling unit) O O
PR030/B (separate power supply unit) S S
Ekip T&P (External unit for power supply, communication and testing via USB) T T
PR010/T (External unit for tests) T T
Key:
S : standard function/unit,
O : optional function/unit,
T : optional unit for temporary connection,
- : function/unit unavailable.
Notes:
1. : with PR120/V module,
2. : with PR120/D-M module,
3. : with internal PR120/D-BT module.
The main features and improvements of the relay PR12x with respect to the earlier PR11x are (depending on the combination of
relay-modules):
1. High current reading accuracy (up to 1.5%) 1.5%) and numerous other functions.
2. Continuous control of current sensors and trip coil connection.
3. Recording of the cause for tripping, also in the self-supply condition.
4. Extended neutral selection.
5. High performance event recording (data logger) with 8 analog and 64 digital signals synchronizable with hundreds of events/
situations as chosen by the user.
6. Double protection G function with simultaneous reading by two different current sensors (simultaneous use of the double
sensor available with PR123/P).
7. Double protection S (available with PR123/P).
8. New residual-current function (Rc).
9. Analysis up to the 40th harmonic.
10. New PR120/V module: supplies power and measures the busbar voltage.
11. New PR120/K module: provides programmable inputs and outputs.
12. New PR120/D-M module: enables communication via RS485.
13. New PR120/D-BT module: enables communication between the relay and PC via Bluetooth.
5. Connection to a PC via wireless Bluetooth (with BT030-USB or PR120/D-BT) or USB (with BT030-USB or Ekip T&P).
6. Serial connection for external modules Flex Interface and HMI030.
7. “Real time” date and time settable by relay of PC (with communication unit).
8. Software applications available for relay maintenance and tests.

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1.1. Safety Notes
Read this manual carefully and completely.
The use of this device should be reserved for qualified and expert personnel only.
WARNING: this symbol gives information about operations, actions or circumstances that can cause injuries to
the personnel, damage to the unit or economic losses.
You must assume that safe usage is impossible if:
1. the unit shows visible signs of damage.
2. the unit does not function (for example with autotest or with the trip test unit).
3. the unit has been damaged in transit.
If in doubt, about its safe usage, the unit must be put out of service to prevent any accidental use.
WARNING: Prior to servicing and/or replacing, the circuit-breaker must be open.
Also remember to disconnect all power supplies connected.
1.1.1. Notes for dielectric stiffness tests
WARNING:
Dielectric strength tests must not be performed on the inputs and outputs of relays PR122/P and PR123/P.
1.2. Abbreviations and notes
1.2.1. Abbrevations
Abbreviations Meaning
YO Opening coil
YC Closing coil
CB Circuit-Breaker (for example Emax)
CS Current Sensor (Current sensor)
Ekip Connect Communication software for PC, for electronic devices installed in ABB SACE CB
Emax Series of ABB SACE air circuit-breakers
HW Hardware
In Rated current of the Rating Plug installed in the circuit-breaker
i-Test "i-Test" button on the front of relay
MT Thermal memory
Pn Circuit-breaker rated power
Pnfase Phase rated power
Relè Electronic protection and control unit for ABB circuit-breakers
RMS Root mean square value
SdZ Zone selectivity
SW Software
TC Trip Coil (opening solenoid)
TO Current sensor for residual current reading (Rc)
Trip CB opening, generated by the release
TV Voltage transformer (see also VS)
Un Rated voltage of the voltage transformers installed (phase voltage)
UI/O External current sensor for earth fault current reading (SGR)
Vaux Auxiliary power supply
VS Voltage Sensor (see also VT)

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2. SACE PR122/P and PR123/P relays
2.1. Introduction
PR122/P and PR123/P relays possess many common characteristics:
- Graphic interface: display, push-buttons and interactive menu.
- HW: connectors and accessory modules.
- SW: basic protection and measuring functions.
Unless different indications are given, the functions and characteristics described in the following chapters are common to both
models.
2.2. Identification
The PR122/P and PR123/P units which, in accordance with IEC standards, are available with various protections, default modules
and optional equipment, are illustrated in the figure below:
2.3. Specifications
2.3.1. General characteristics
Relays PR122/P and PR123/P are high-performance electronic units for Emax CB. Their function is to monitor and protect against
fault current.
The units also possess Measuring, Data Storage, Communication, Self-Test, Load Control and Zone selectivity functions
for Emax circuit-breakers.
The units installed on CB are connected to the current sensors for primary current reading, to the Trip Coil for circuit-breaker
opening control and to the state contacts of the CB.
The sensors provide the primary current measurement and the energy for powering the relay, even in the absence of external
power supply.
Connected directly to an opening mechanism, the Trip Coil allows the CB to open. The command is transmitted to the Trip coil
in accordance with the protection settings.
The state contacts of the CB provide information about the CB's position.
A graphic display and a set of push-buttons allow all the relay's information to be accessed. They can also be used to adjust the
protections and settings and to read the state and alarms, the presence of which is indicated by two front leds.
Depending on the version, the adjustable protections available are:
Symbol Protection against
L overload with inverse long time delay
S short-circuit with adjustable delay
I instantaneous short-circuit
G earth fault with adjustable delay
U phase unbalance
OT temperature off range
MCR closing on short-circuit
Rc Residual current

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Relay PR123/P includes 2 further basic protections:
S2 short-circuit with adjustable delay
D directional short-circuit with adjustable delay
Presence of the PR120/V module allows further protections to be controlled for both relay models:
UV undervoltage
OV overvoltage
RV residual voltage
RP reverse active power
UF underfrequency
OF overfrequency
U phase-to-phase voltage unbalance (as an alternative to phase currents)
Relays PR122/P and PR123/P also provide a fixed protection against instantaneous short-circuit at high current values, called
linst protection.
Relays PR122/P and PR123/P have 5 dedicated connections (2 digital inputs, 2 digital outputs and a common signal) for the
zone selectivity function.
A set of modules and accessories allows optional functions to be added to the basic version:
Internal modules:
- PR120/V: supplied as part of the standard equipment with PR123/P and as an optional with PR122/P, this module allows the
primary voltage values to be read and provides energy for powering the relay even in the absence of external Vaux, nil current
or CB open.
- PR120/D-M: allows the relay to be connected in a communication network so that the CB can be read and controlled even from
remote locations. The module also allows the state of the springs and the CB position (in the case of a withdrawable CB) to be
read and the opening and closing coils to be remote controlled.
- PR120/K: module with input and output contacts. Allows alarm or state signals to be associated with programmable electro-
mechanical contacts and a digital input to be programmed for various functions.
- PR120/D-BT: for communication with the relay via a PC/PDA (via Bluetooth).
Temporary accessories:
- PR030/B for powering and performing the installation operations.
- BT030-USB for relay powering and communication functions and supervising all the parameters and information via a PC.
- PR010/T allows the relay to be powered, enables the protections to be tested and test reports to be saved.
- Ekip T&P, similarly to BT030-USB, can be used to power and communicate with the relay via a PC. It also allows units like
PR010/T to be tested via a PC.
Fixed accessories:
- The HMI030 switchgear display allows the measurements to be viewed on the front of the switchgear itself.
- Flex Interface modules allow alarm or relay state signals to be associated with programmable electromechanical contacts.
They also allow a complete network of several units to be created and can also be connected to external modules (e.g. HMI030).
Consult the following chapters or the dedicated manuals for details about each individual unit.
Ekip Connect SW, which is available free of charge from the Internet website or is supplied with the two BT030-USB and Ekip
T&P modules, allows the PC and the communication modules for Emax to communicate.
2.3.2. CB compatibility
Relays PR122/P and PR123/P can be installed on CB of the three-pole and three-pole with external neutral type, or any model
of four-pole Emax CB.
The CB model establishes the rated uninterrupted current the circuit-breaker is able to support (lu).
The adjustable protections refer to the In model, defined by the interchangeable Rating plug module installed on the relay.
2.3.3. Standards
Relays PR122/P and PR123/P have been designed to operate in accordance with the following international standard: IEC 60947-
2 Low voltage apparatus. Circuit-breakers.
2.3.4. Environmental characteristics
Operating temperature (Standard version) -25°C ... +70°C
Storage temperature -40°C ... +70°C
Relative humidity 0% ... 98% with condensation
Degree of protection (with release installed in the CB). IP 30

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2.3.5. Electrical characteristics
2.3.5.1. Primary current
The unit guarantees full operation under the following primary current conditions:
Rated operating frequency 50/60 Hz ±10%
Peak factor 2,1 @ 2xIn in compliance with IEC 9472 Annex F.
(Consult ABB for a dedicated analysis if there are higher peak factors)
2.3.5.2. Power supply
The relay unit needs a power source: this can be supplied by the current sensors installed on the internal poles of the circuit-
breaker, by module PR120/V or by means of Vaux:
- All that's needed to supply the relay by means of the internal current sensors is the presence of minimum three-phase turn-on
current.
- The presence of minimum three-phase turn-on voltage is all that's required to power the relay via module PR120/V. The module
also allows internal modules PR120/K and PR120/D-BT to be powered.
- Supplied externally by means of a galvanically insulated power supplier, Vaux guarantees uninterrupted operation of the unit
(even with nil current or with the circuit-breaker open) and expansion of the accessory functions of the relay, thus allowing
internal modules (if installed) and external devices (HMI030 and Flex Interface) to be used.
Primary current characteristics Relay Enabling (1)
Relay Activation (2) Activation of display
lighting (3)
CB models E1, E2, E3 E4, E6 E1, E2, E3 E4, E6 E1, E2, E3 E4, E6
Minimum three-phase busbar current >100 A (4)
>200 A >160 A (5)
>320 A >300 >600
Frequency, Peak factor See par. 2.3.5.1
Primary voltage characteristics Relay and display powering (2)
Activation of display lighting (3)
Three-phase minimum network voltage (relay) 60V 70V
Three-phase minimum network voltage (relay+PR120/
D-BT)
70V 70V
Three-phase minimum network voltage (relay+PR120/K) 70V 90V
Three-phase minimum network voltage (relay+PR120K
and PR120/D-BT)
90V 110V
Vaux characteristics Activation of display lighting (3)
DC voltage (galvanically separated) 24 Vdc ±20%
Maximum ripple 5%
Inrush current @ 24Vdc ~10 A for 5ms
Rated power @ 24Vdc ~2 W
Inrush current @ 24Vdc with internal modules connected ~15 A for 5ms
Rated power @ 24Vdc with internal modules connected ~6 W
NOTES:
(1)
: protections activated and display on in the Low Power configuration (See par. 2.3.5.3 Operating mode).
(2)
: protections activated and display on in the Full Power configuration (See par. 2.3.5.3 Operating mode).
(3)
: protections activated, display on in the Full Power configuration and display lighting on.
(4)
: Emax E1 and E2 Iu=250A: minimum three-phase busbar current >30A.
(5)
: Emax E1 and E2 Iu=250A: minimum three-phase busbar current >50A.
WARNING: Since the auxiliary voltage needs to be isolated from the ground, “galvanically separated converters”
in accordance with the IEC standard 60950 (UL 1950) or the equivalent IEC 60364-41 and CEI 64-8 have to be
used to guarantee a current in common mode or leakage current (as defined in IEC 478/1 and CEI 22/3) no
greater than 3.5mA.
2.3.5.3. Operating mode
In accordance with the supply conditions described in par. 2.3.5.2, relays PR121/P and PR331/P guarantee operation in three
different modes:
- Low Power: this mode guarantees operation of all the protections provided by the relay, operation of the front LEDs and display
powering in the Low Power mode, but access to the menus is not allowed.
- Full Power: this mode guarantees operation of all the protections provided by the relay, operation of the front LEDs, display
powering in the Full Power mode and access to the menus.
- Full Power and display lighting: this mode includes all the Full Power functions and powers the display lighting system.

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2.4. User interface
A graphic display and a push-button panel provide all the settings and information of the PR122/P and PR123/P relays.
1 2 3 4
5 6 7 8 9 10 11 12
Ref. Description
1 Pre-alarm indicator LED
2 Graphic display
3 Serial number of the relay
4 Rating plug
5 Position for internal PR120/D-BT module
6 Position for internal PR120/K module
7 Position for internal PR120/D-M module
8 Position for internal PR120/V module
9 Voltage takeoff isolator
10 Main push-button panel
11 Test connector
12 “i Test” button
2.4.1. LEDs
Relays PR122/P and PR123/P have 2 front leds, which provide information about the state of the relay and CB.
Both leds function when the unit is on.
Signal Colour State Description
ALARM Red
OFF No protection or delay alarm
ON (Flashing @1Hz)
Delay in progress for one or more of the following protections: current (L,
S, G), voltage (UV, OV, RV), frequency (OF, UF), active power reversal (RP),
phase unbalance (U)
Alarm for one or more: Contact wear, Temperature
Connection error of one or more: Rating Plug, Trip Coil , Key plug error,
Current sensors
Installation error
ON (Fixed) Internal error (ABB assistance required)
WARNING Yellow
OFF No CBB error or alarm
ON (Flashing @0.5Hz) OT protection in prealarm
ON (Flashing @1Hz) OT protection in alarm state
ON (Fixed)
Protection L prealarm
Protection U alarm with trip disabled
Distorted wave form with > 2.1 Form factor
Contact wear within range: 80%<CW<100%
Iw WARNING threshold exceeded
CB state error
Frequency off range
Configuration error
Incongruent settings

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2.4.2. Push-buttons
A push-button panel with 4 buttons is used to access and surf the menus on the displays of relays PR122/P and PR123/P.
There is also an independent button with various different functions (iTest).
Key Name Description
ESC
- Press ESC from the default page to access the main menu
- Press ESC from within the menus to return to the previous level
ENTER
- Press ENTER from within the menus to access the selected level or parameter
- Press ENTER to confirm the option selected
UP
- Press UP or DOWN from the default page to access the pages with the available measurements (cur-
rent values and, if the PR120/V module is installed, also the voltage and active, reactive and apparent
power values)
- Press UP or DOWN within the menus to scroll the menu options
- Press UP or DOWN within the parameter or setting areas to change their values
DOWN
iTest
- Press iTest from the default page to access the area with the information pages about the relay,
circuit-breaker and last trip recorded.
- Press iTest after the CB has opened owing to an electronic protection to reset the TRIP state of the
relay (the display is redirected to the default page and the SW register corresponding to Trip is reset)
- Press iTest when the relay is off to obtain a description of the last event that led to shut-off (function
available within 48h from shut-off).
WARNING: When parameters whose adjustment includes a large number of options or values are edited, the UP
or DOWN buttons can be pressed and held down so as to scroll through the options faster and speed up the
editing operations.
2.4.3. Display
Relays PR122/P and PR123/P are equipped with a 128x64 pixel LCD graphic display where the operator can view measurements
and signals, and adjust protections and settings.
The degree of contrast can be adjusted via the menu, in the Settings-Display Contrast section.
The display has 2 operating modes (the conditions are described in par. 2.3.5.3):
- Low Power: the display is fixed and appears as shown in the figure below:
1
2
3
4
5
- Full Power: various menus and information areas can be accessed with the buttons in this configuration: the main page is dis-
played (default page) during normal operation, and appears as shown in the figure below:
6
2
3
7
5
The measurements area or the menu area are accessed from the default page. All the options within the menu are displayed as
shown in the figure below:
2
8
9
10
11
5
Access to the menus and the push-button panel is active in the Full Power mode. Consult the dedicated chapter for details about
how to browse the menus (See par. 2.5 User menus).

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Ref. Description
1 Phase current measurement
2 CB and/or relay alarms (the ABB logo appears in the absence of alarms)
3 Internal relay clock
4 “Low Power“ message
5 Operating icons
6 Graphic ammeter and voltmeter
7 Rms value and highest measured current phase (cyclically updated value)
8 Name of the menu being browsed
9 List of options available in the menu being browsed (the value that appears in black is the one that has been selected)
10 Number of options available in the menu being browsed
11 Value or description of the selected option
2.4.3.1. Graphic ammeter and voltmeter
Graphic ammeter and voltmeter options are available in the default page (the voltmeter is only activated if module PR120/V is
installed).
The levels of the available measurements are displayed by a vertical bar.
The current (phase) and voltage (network) values are positioned along the abscissae, with the reference and rated value setting
along the ordinate: an intermediate line indicates the 1In value for the current values and the rated voltage for the voltage values.
1IneTensione
nominale
Example: if the bar corresponding to current I1 exceeds the intermediate line, it means that the measured value is higher than 1In.
2.4.3.2. CB and relay alarms
Information about the state of the relay and CB is always available at the bottom left of the display (See par. 2.4.3 Display Ref.2).
The ABB logo appears in the absence of alarms.
If one or more alarms have occurred, they will be displayed by a message that flashes every 2 seconds. The alarms are displayed
in conjunction with an icon showing the type of alarm in question (information, active delay, danger).
Icon Message Description
Configuration Inconsistent parameters or inconsistent data between key plug and relay
Prealarm [L] / [T] Prealarm condition of the specified protection. Example: “Prealarm L”
Warning Iw Iw threshold exceeded
Contact wear Contact wear prealarm (>80%)
Date not valid Incorrect date that must be programmed (new relay)
CB not defined “Open/closed” circuit-breaker state inconsistent or incorrect
Frequency range Frequency measured beyond declared range (<-10% or >+10%)
Alarm T Internal temperature of relay off range (<-25° or >85°)
Time delay [L] / [S] / [G] / [Gext] / [U] / [UV]
/ [OV] / [RV] / [RP] / [UF] / [OF] / [S2] / [D]
Time delay condition of the specified protection, which can conclude with an
opening command transmitted to the CB. Example: “OV time delay”
Contact wear Alarm for contact wear (=100%)
Harmonic distortion Alarm for measured harmonic distortion (form factor>2.1)
[G] / [Gext] / [T] (TRIP OFF) Alarmofthespecifiedprotection,ofwhichthetripfunctionhasbeendisabled.
Example: “Gext (TRIP OFF)”
Alarm [U] / [UV] / [OV] / [RV] / [RP] / [UF]
/ [OF]
Alarm of the specified protection, of which the trip function has been disabled
or if the trip is activated but the CB is already open Example: “Alarm RP“
Load [LC1] / LC2] Load control alarm. Example: “Load LC2“
Sensor [L1] / [L2] / [L3] / [Ne] / [Gext] Alarm of the specific current sensor (disconnected or faulty). Example:
“sensor L3“
TC disconnected Trip Coil disconnected or faulty
Rating Plug Rating plug absent, disconnected, faulty or of a model superior to the lu
Installation Error following an incorrect installation procedure or failure to install
Power factor Power factor module lower than set limit
Phase cycle Inverted cyclic direction of the phases (in conjunction with the voltages)
Local bus Error in local bus owing to absence of communication or error

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The following table describes all the messages that could appear on the display in a pop-up window after an unallowed attempt
to configure parameters or settings.
Alarm message Description
Password error
Session impossible
A programming session cannot be started due to a contingency (e.g. a timer-controlled delay
still elapsing)
Value off range Value beyond the established limits
Failed 1001/2001 Inconsistency between thresholds of protections L and S (SETA/SETB)
Failed 1002/2002 Inconsistency between thresholds of protections I and S (SETA/SETB)
Failed 1006/2006 Inconsistency between thresholds of protections I and D (SETA/SETB)
Failed 1005/2005 Inconsistency between thresholds of protections L and D (SETA/SETB)
Failed 1009/2009 SdZ incompatible SdZ directional
Failed 1003/2003 Inconsistency between thresholds of protections L and S2 (SETA/SETB)
Failed 1004/2004 Inconsistency between thresholds of protections I and S2 (SETA/SETB)
Failed 3001 Problems with language change
Failed 3002 Problems with toroid RC setting
Failed 3003 Problems with neutral setting
Exception 6 Control momentarily unavailable
Unavailable Function temporarily unavailable
Invalid date Date and time not updated. Set them.
Parameters revised Programming session concluded correctly
Cancelled Programming session cancelled
Failed Programming session rejected
2.4.3.3. Operating icons
An area with icons showing the operating conditions of the relay is available on the display.
The area is at the bottom right of the display (See par. 2.4.3 Display Ref.5) and includes 4 positions in which the icons can be shown.
Starting from the position on the far right, a description of the available icons is given below:
Position Icon Condition Description
1
(right)
OFF Datalogger function deactivated
ON (Fixed) Datalogger function activated, awaiting an event to record
ON
(Flashing @1Hz)
Datalogger function activated with recording completed and waiting to save data
or restart
2
OFF
Dual set deactivated. One single configuration set is available for adjusting the
protections
ON
Dual set activated. Two configuration sets are available for adjusting the protec-
tions
The icon depicting the operative configuration set ([A] or [B]) is displayed
3
OFF External Vaux power source absent
ON External Vaux power source present
4
(left)
OFF Editing of parameters and settings via the local mode. No update in progress
ON
Editing of parameters and settings via the local mode. Update in progress: the
icon appears if the users has changed some of the parameters but has not yet
completed the operation by selecting CONFIRM. The icon only disappears after
the changes ave been confirmed or annulled
OFF Editing of parameters and settings via the local mode. No update in progress
ON
Editing of parameters and settings via the remote mode (only activated if the
PR120/D-M module is installed)

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2.4.4. Rating Plug
The rating plug defines the rated current In, which is essential for regulating the protections: this is because because the regula-
tion of all the protections refers to In (e.g.: I1= 0.4 xIn).
The rating plug is installed on the relay on a dedicated front connector and is available to the user.
The relay can be equipped with various Rating Plug models, up to the value Iu (uninterrupted rated
current lu indicaed on the rating plate affixed to the front guard).
Example: CB E1B800 has Iu= 800 A, and can be fitted with a rating plug with In 800A.
The module is interchangeable, with the relay off and the CB open.
The relay continuously checks for the presence of the rating plug and signals its absence or any
assembly errors.
WARNING: Replacement of the rating plug with the relay on or the CB closed could lead
to faulty relay operation, or undesired opening of the CB.
2.4.5. External connections
Relays PR122/P and PR123/P can be connected to several different external units by means of a test connector on the relay
itself, or by means of the terminal box on the upper part of the CB.
Consult the dedicated chapters and the installation documents of the individual modules for further details about operation and
installation.
2.4.5.1. Test connector
The connector, which is installed on the front of the relay, allows PR020/B modules to be connected for temporary powering of
the relay, and BT030-USB, PR010/T and Ekip T&P for powering, communication and testing via a PC (or via the unit itself in the
case of PR010/T).
2.4.5.2. Internal modules
Relays PR122/P and PR123/P can be connected to 4 internal modules. Each module has a dedicated connector on the rear side
of the relay.
Some modules have a further connector, connected to internal contacts or to the terminal box of the CB.
All the details concerning the internal modules are given in the dedicated chapters (See par. 2.11 Internal modules).
2.4.5.3. External sensors
Relays PR122/P and PR123/P can be connected to external sensors of 3 different types: external neutral sensor, earth fault cur-
rent sensor SGR and residual current sensor Rc.
The sensors are connected to the relay by means of the terminal box installed on the CB.
Details about the installation and connection operations are described in the wiring diagrams of the installation, while the associ-
ated functions are described in the chapters dedicated to protections Gext (see par. 2.6.9) and Rc (see par. 2.6.10).
2.4.5.4. Power supply of Vaux, Zone Selectivity and fixed external Accessories
The external power supply connections for Vaux, the zone selectivity signals and connections for the Flex Interface or MHI030
fixed external modules are available in the terminal box of the CB.
2.5. User menus
Relays PR122/P and PR123/P come on in the Full Power mode in the presence of the supply conditions described in par. 2.3.5.2,
or if supplied by: Vaux, PR030/B, BT030-USB, Ekip T&P or PR010/T.
The operator can browse the menus on the display in the Full Power mode. When powered, the unit displays a default page from
whence the operator can access three different areas:
- Measurements Area, by using the UP and DOWN buttons.
- Information Pages, by using the iTest button.
- Menus Area, by using the ESC button to access and quit the menu section.
2.5.1. Measurements Area
One or more pages of relay measurenments are available in this area.
The current measurements page is always activated while the voltage and power measurements pages can be consulted
if the PR120/V module is installed.
Consult the chapter about the Measuring functions for further details about the information given in this area (See par.
2.7 Measuring functions).
2.5.2. Information Pages
This area contains 3 pages about the main relay and CB details: “protection unit“ page, “Circuit-breaker“ page and “last
opening“ page.
Press the iTest button within 5 sec to change page.

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2.5.3. Menu Area
The menu area features a tree structure allowing all the information and parameters to be managed with various levels
of detail.
The main menu, which the user can access by pressing ESC from the default page, includes 5 options:
Main Menu Option Description Paragraph
1. Protections Reading and adjustment of all the protections available 2.6
2. Measurements Reading of all the measurements made by the relay, Trip and events 2.7
3. Settings Reading and editing of the main relay, CB and Module settings 2.9
4. Test Allows diagnosis and state control tests to be performed 2.10
5. Information Main relay and CB information readings --
The various different menus are described in the sections indicated in the table.
2.5.3.1. Menu browsing
The operator can browse within each level by using the main push-button panel:
- ENTER to access a submenu or confirm an edited parameter
- ESC to quit a submenu or annul the changes made to a parameter
- UP and DOWN to scroll the menu options
The editing menus can only be accessed after the user PW has been entered.
The parameters can be edited by scrolling the options available in the specific menu and by selecting the required option with
the ENTER button. Some of the parameters update immediately (such as the date) while others require confirmation (CONFIRM).
To accomplish the CONFIRM operation, the operator must quit the menus through to level 1 where there is a new page called
PROGRAMMING in which 3 options can be chosen:
- CONFIRM: confirms the changes made
- ANNUL: annuls the changes made
- EDIT: allows the operator to browse the menus again and make further changes to the parameters.
Selection of the first two options accesses a temporary window giving the programming result (parameters updated or operation
annulled).
2.6. Protection functions
Relays PR122/P and PR123/P control numerous independent protection functions.
The current, voltage, frequency and temperature signals of the relay are processed by the relay's microprocessor which signals
alarms, performs time delay processes and sends commands, depending on the time and protection level settings.
The various adjustable protection types are managed by the relay in different ways:
- The current protections are processed according to the true root mean square value of the current values read by the current
sensors.
- ThevoltageprotectionsareprocessedaccordingtothetruerootmeansquarevalueofthevoltagevaluesreadbymodulePR120/V.
- The frequency protections undergo voltage frequency control.
- Moreover:
- The temperature protection is monitored by means of the relay's internal sensor.
The Iinst fixed protection is also available and can neither be disabled nor adjusted: its tripping thresholds are established by
ABB personnel only.
The Protections menu also allows the operator to view and edit all the available parameters.
Protections Options available
Relay compatibility
PR122/P PR123/P
Protection L Threshold, Time, Curve, Thermal memory S S
Protection S Enabling, Threshold, Time, Curve, Thermal Memory, Zone selectivity, Startup S(1)
S
Protection S2 Enabling, Threshold, Time, Thermal Memory, Zone selectivity, Startup -- S
Protection D Enabling, Threshold, Time, Trip enabling, Zone selectivity, Startup -- S
Protection I Enabling, Threshold, Startup S S
Protection MCR Enabling, Threshold, Operating time slot S(2)
S(2)
Protection G Enabling, Threshold, Time, Curve, Trip enabling, Zone selectivity, Startup S(3)
S(3)
1/3
Confirm
Abort
Modify
Confirm
Programming

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Protections Options available
Relay compatibility
PR122/P PR123/P
Protection Gext Enabling, Threshold, Time, Curve, Trip enabling, Zone selectivity, Startup O(4)
O(4)
Protection Gext(Idn) Enabling, Threshold, Time O(5)
O(6)
Protection U Enabling, Threshold, Time, Curve, Trip enabling S S
Protection UV Enabling, Threshold, Time, Trip enabling O(7)
S
Protection OV Enabling, Threshold, Time, Trip enabling O(7)
S
Protection RV Enabling, Threshold, Time, Trip enabling O(7)
S
Protection RP Enabling, Threshold, Time, Trip enabling O(7)
S
Protection UF Enabling, Threshold, Time, Trip enabling O(7)
S
Protection OF Enabling, Threshold, Time, Trip enabling O(7)
S
Protection T Enabling S S
Load protection Enablingandthreshold(1),Enablingandthreshold(2),Enablingandthreshold(Iw) S S
Doubleprotectionset Enabling, Default set, programmed event for set change -- S
Neutral Protection Enabling, Threshold S(8)
S(8)
Key:
S : standard protection
O : optional function
Notes:
1. : function available with versions LSI, LSIG, LSIRc
2. : enabling and parameters available with units PR010/T, Ekip T&P, BT030 or communication via PR120/D-M
3. : function available with versions LSIG
4. : function enableable with versions LSIG, and external SGR sensor.
5. : function enableable with versions LSIG (+ module PR120/V) and LSIRc, and external Rc sensor.
6. : function enableable with versions LSIG, and external Rc sensor.
7. : functions available when module PR120/V is installed
8. : function available with four-pole CB, or three-pole CB in the 3P+N configuration
2.6.1. Notes about Protection Operation
Relays PR122/P and PR123/P are equipped with a “backup-protection” function. If the first command to the trip coil fails to open
the circuit-breaker immediately (TC locked), further trip commands are transmitted until the circuit-breaker opens.
If the wave forms of the signals read by the relay are distorted beyond the declared limit (see peak factor), the calculation toler-
ance of the real root mean square value will increase.
2.6.2. Protection L
The “L” is the only protection that cannot be disabled because it is for self-protection against overloading of the relay itself. The
types of trip curves settable are divided into two groups according to the standard they refer to.
Standard trip curve according to IEC 60947-2
Only one type of curve is settable (t=k/I2
) as defined by the IEC standard 60947-2.
The tripping time is calculated in relation to the value of If:
- For fault currents If 12ln, the tripping time of the protection is given by the expression: t(s)= . If the calculated value is
less than 1 second, the real tripping time is forced to 1 second (t(s)= 1s.).
- For fault currents If >12ln, the tripping time is always t(s)= 1s.
Standard trip curve according to IEC 60947-2
3 types of curve settings can be made and are defined by standard IEC60255-3 as A, B and C.
The protection trip time, with inverse time, is given by the expression:
 
b
I
k
t 


1

where
1
I
I
I
f

NOTES:
- t(s): envisaged tripping time
- If : fault current; given in [In] (example: 0.7In)
- I1 , t1: protection L parameters set by the user, given in [In] and [s]

- , k: parameters suggested by standard IEC60255-3, which vary with the type of gradient selected (e.g. for type B gra-
dients: = 1 and k = 13.5)
- b: parameter introduced by SACE to increase the number of curves with the same gradient. This parameter is auto-
matically calculated by setting parameter t1 (required tripping time with If= 3xI1).
Protection L has 3 operating conditions established by the fault current level If and by the setting of the protection itself I1:

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If 0.9 xI1 No alarm, all settings possible. No time delay in progress.
0.9 xI1 < If < (1.guatda.com/cmx.p05...1.2) xI1 Prealarm L signal, all settings possible. No opening time delay in progress.
(1.guatda.com/cmx.p05...1.2) xI1  If Alarm L signal, no setting possible. Opening time delay in progress.
WARNING: the protection L threshold entry range ensures that:
- the relay does not set to the alarm status for current values of less than 1.05 xI1;
- the relay will set to the alarm status for current values exceeding 1.2 xI1.
2.6.2.1. Thermal memory L
The thermal memory function can be enabled for cable protection. It is based on the “L” parameter, defined as the tripping time
of the curve (t1) selected at 1.25xI1. The function can be activated via PR010/T or Ekip Connect.
The tripping time of the relay will certainly be 100% of that selected after time L has elapsed since the last overload or the last
trip, otherwise the tripping time will be reduced in relation to the overload that has occurred or the time that has elapsed.
Relays PR122/P and PR123/P are fitted with two instruments for processing the thermal memory. The first only operates when
the relay is powered (it also records overloads that have not lasted long enough to trip the relay), while the second even func-
tions when the relay is not powered, reducing any trip times in the case of an immediate reclosing and activating moment the
circuit-breaker trips.
It is the relay that decides which of the two to use, depending on the various different situations.
WARNING: The thermal memory function can only be set if the standard type of curve has been selected (t=k/
I2
)..
2.6.3. Protection S
This protection can be disabled; it can be of the fixed time (t=k) or inverse time (t=k/I2
); in the latter case, the trip time is given by
the expression.
The tripping time with inverse time curve is given by the expression: t(s)= . If the calculated value is less than t2, the
real tripping time is forced to t2 (t(s)= t2.)
NOTES:
t(s): envisaged tripping time
If : fault current; given in [In] (example: 1.4In)
I2 , t2: protection S parameters set by the user, given in [In] and [s]
2.6.3.1. Thermal memory S
The thermal memory function can be enabled for cable protection in the case where the curve with inverse time is selected. This
is based on the “tS” parameter defined as the trip time of the curve (t2) selected at 1.5xI2. The other characteristics are the same
as those for thermal memory L.
2.6.3.2. Start-up threshold S
The start-up function can be selected in the case where the curve with fixed time is selected.
The function can be disabled and it is a setting characteristic of the single protection units.
The start-up function enables the protection threshold (S, I and G) to be changed during a time interval lasting “ts”, starting from
“start-up”. The latter must be intended as follows:
- Passage of at least one of the phase currents above the activation threshold of the adjustable Start-Up with Ekip Connect or
PR010/T (0.1…10In, by 0.1In steps); A new start-up is possible after the current has dropped below this threshold.
I
t
Start-Up Threshold I2
ts
Threshold I2
Activation of Start-Up
Threshold Start-Up activation

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2.6.3.3. Zone S selectivity
The zone selectivity function, guaranteed only if an auxiliary voltage is provided, enables the area of the fault to be isolated, only
isolating the part of plant nearest to the fault, while keeping the rest of the plant operational.
This is done by connecting all the zone selectivity outputs of the releases belonging to the same zone to one another (ZSO=K51/
SZout) and taking this signal to the zone selectivity input (ZSI=K51/SZin) of the next release on the supply side. If the wiring has
been done correctly, all the zone selectivity inputs of the last circuit-breakers in the chain and all the outputs of the circuit-breakers
at the head of each chain must be empty.
Area 1
RELAY 1a RELAY 1b
ZSO ZSO
1a 1b
RELAY 1
ZSI1
ZSO1
Area 2 Area n
RELAY 2
ZSI2
ZSO2
RELAY 0
ZSI0
RELAY n
ZSIn
ZSOn
As a practical example, the figure above shows a fault on the load side of the “Relay 1a” isolated by the latter without the “Relay
1” or the “Relay 0” being affected; a fault immediately downstream from the “Relay 1” will be isolated by the latter without the
“Relay 0” being affected, thus ensuring that the Areas 2...n remain operational.
The following logical table is implemented to manage the Zone Selectivity Input (ZSI) and Zone Selectivity Output (ZSO) signals:
Zone selectivity If > I2 ZSI signal ZSO signal Trip T
Excluded NO 0 0 No trip
Excluded NO 1 0 No trip
Excluded YES 0 0 t2 programmed
Excluded YES 1 0 t2 programmed
Inserted NO 0 0 No trip
Inserted NO 1 1 No trip
Inserted YES 0 1 tselectivity
Inserted YES 1 1 t2 programmed
The time t2 must be set at a value higher than or equal to tselectivity +50 ms, on the CB on the supply side, not required on the first
one in the chain.
2.6.4. Protection S2
Relay PR123/P allows two protection S threshold to be set. They are independent of each other but can be activated at the same
time.
This function allows a better selectivity level to be obtained than by using a relay without a “double S”.
WARNING: The zone selectivity function with double S is valid with the t=k time setting.
2.6.5. Directional protection D
The PR123/P unit carries out excludable directional protection against short-circuit with adjustable fixed time (t = k) active both
with self-powering and with auxiliary supply.
The protection functionality is very similar to protection “S” with fixed time, with the capacity to recognize the current direction
during the fault period as well.
The direction of the current enables the determination of whether the fault is on the supply side or the load side of the circuit-
breaker. Especially in ring distribution systems, this enables the distribution stretch where the fault occurred to be identified and
isolated without interfering with the rest of the installation (using zone selectivity).
To determine the direction of the current, the value of the phase reactive powers has to be higher than 2% of the nominal phase
power
(PQ≥2%·Pnphase).
The PR123 enables you to define the power flow in the circuit-breaker from the menu:
from high to low (Top  Bottom),
from low to high (Bottom  Top),
selectable in the menu Modules Measuring Module (PR120/V).
As a result, the currents in the circuit-breaker will be defined as “forward” or “backward” if their are in phase or out of phase with
the previously-defined power flow.

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Ifault (If)
Power flow set
Top  Bottom
Power flow set
Top  Bottom
Value Direction Trip T Trip T
If < I7 Either No trip No trip
If > I7 High  Low t7FW t7BW
If > I7 Low  High t7BW t7FW
Example:
Once the power flow has been set as “Top  Bottom”, the direction of the figure alongside is:
CB
Z
V
I
Inductive/resistive load
positive reactive power in  “forward” direction;;
negative reacti ve power in  “backward” direction
If the preset trip times were t7FW = 200 ms and t7BW = 400 ms, in this case the relay
would have opened the circuit-breaker after t7FW = 200 ms.
Note:
- With the directional protection D activated, if the direction of the power cannot be determined the relay takes effect considering
shorter of the programmed times between t7fw and t7bw.
- This protection works on the basis of the phase currents, not the neutral current.
2.6.5.1. Start-up threshold D
The function behaves in exactly the same way as the protection S.
2.6.5.2. (Directional) zone selectivity D
The Directional Zone Selectivity (SdZ D) function is particularly useful in ring and grid type systems where, in addition to the zone,
it is essential to define the direction of the power flow that powers the fault.
SdZ D can be enabled as an alternative to Zone Selectivity S and G (which must be disabled in order to obtain correct operation)
and needs Vaux.
To define the zone and power flow, each relay has two inputs (DFin and DBin) and two outputs (Dfout and DBout), which must
be suitably connected to the other relays (see example below).
As in the SdZ S and G, the relays interact with each other, sending cutout signals via the outputs and reading them via the inputs.
The general behavior is summarized in the table below.
(Example with power flow setting “Top  Bottom”).
Ifault (If) Output status Input status T trip
Value Direction DFout DBout DFin DBin
If < I7 either 0 0 either either No trip
If > I7 Top  Bottom 1 0 0 either ts
If > I7 Top  Bottom 1 0 1 either t7FW
If > I7 Bottom  Top 0 1 either 1 t7BW
If > I7 Bottom  Top 0 1 either 0 ts
If the power flow is in phase with the direction set on the relay, the output DFout is enabled (1).
Vice versa, if the power flow is out of phase, the output DBout is enabled (1).

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The typical configuration of the system of circuit-breakers for which the SdZ D is likely to be used is the sort of ring illustrated in
the following figure.
DFout4
DFout1
DFin1 DFout2
DFout3
DBin1
DBout1 DBin2
DFin4 DBout4
DBout2 DFin2
DBin3
DBin4
DFin3
DBout3
Generator
Relay 4
Relay 1
Relay 3
Relay 2
Load C
Load B
Load A
Forward
power flow
: Output enabled = 1
Fault
Backward
power flow
If a fault is detected (I fault If beyond the threshold I7) in one of the sections of the system (Load A), the final circuit-breakers for
the section in question (Relay1 and Relay2) communicate the presence of the fault to the connected circuit-breakers (Relay4 and
Relay3) by setting the output signals DFout or DBout depending on the direction of the current (DFout1=On, DB2out=On). To be
more precise, the circuit-breakers that limit the section affected by the fault see the direction of the fault current in different ways
(Relay1=forward and Relay2=backward).
The circuit-breakers (Relay1 and Relay2) delimiting the section affected by the fault are tripped with the selectivity time ts, while
the circuit-breakers further away from the fault count down the time t7FW (Relay4) and t7BW (Relay3) without opening; in this
way, the system is isolated, in the time ts, to exclude the part affected by the fault.
The load A, where the fault has occurred, will be disconnected, but loads B and C will continue to be powered normally.
It should be noted that activation of the DBout3 output by the relay3 will have no effect on the relay4, because the latter is re-
cording not an out-of-phase (backward) fault current, but an in-phase (forward) current with the power flow defined previously
by the user (Top  Bottom).
Note:
- With zone selectivity enabled, if the direction of the power flow cannot be ascertained, the relay is tripped considering the lesser
of the programmed times between t7fw and t7bw, without enabling any outputs (DFout or DBout).
- If, for some reason, one of the circuit-breakers required to open does not do so, a specific function will activate the opening of
the first circuit-breaker immediately upstream from it, after a further 100ms approx. In the above example, if the circuit-breaker
does not open with the relay1, only the circuit-breaker with relay4 will open after a time ts+100ms.
- The SdZ D operates on the basis of the phase currents, not of the neutral.
2.6.6. Protection "I"
The protection is enabled/disabled from the menu.
In the case where zone selectivity “S” is active, during the trip of the relay for “I”, the ZSO output signal is activated in any case
to guarantee correct operation of the relay on the supply side (and on the load side.
2.6.6.1. Start-up threshold "I"
The function behaves in exactly the same way as the protection “S”.
2.6.7. Protection against closing on short-circuit “MCR”
The MCR function is used to protect the system against closing.
The protection possesses the same functional characteristics as protection I (it uses the same control and trip algorithm) and
functions if the aforementioned protection I is disabled.
If enabled, the protection functions in the presence of Vaux or PR120/V. It activates the moment the CB closes for a time slot that
can be adjusted by the user, after which it deactivates.
This function can be activated through a hand-held PR010/T unit with the ABB SD-Testbus2 communication softwares or through
a remote system via a system bus.
Protection “S” protects against short circuits.

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2.6.8. Protection “G”
Protection G is performed by the relay with vector analysis of the neutral and phase currents. The fault current is defined by the
following formula:
In the case when the circuit does not show any fault, the module of the sum of these currents is always nil; vice versa the value
of the fault current will take on an increasingly large value depending on the size of the fault. This operating mode is enabled by
default.
The protection, which can be disabled, can be the fixed time (t=k) inverse time (t=k/I2
)
The tripping time with inverse time curve is given by the expression: t(s)= . If the calculated value is less than t4, the
real tripping time is forced to t4 (t(s)= t4).
NOTES:
- t(s): envisaged tripping time
- If : fault current; given in [In] (example: 0.4In)
- I4 , t4: protection G parameters set by the user, given in [In] and [s]
The minimum threshold setting for protection G is 0.1In for relays with SW version  2.05. Adjustment up to 0.1In is available with
Vaux present. In the absence of Vaux, the minimum adjustment becomes 0.2In
WARNING: Protection G is disabled for current values of over 8In (for I4 0.8In), over 6In (for 0.5In I4<0.8In), over
4In (for 0.2In I4<0.5In) and over 2In (for I4<0.2In).
ATTENZIONE: With Iu800A: In the absence of Vaux and with I4<100A, the SW forces the minimum threshold to
100A and “Configuration”error is displayed. With Iu250A: In the absence of Vaux and with I4<30A, the SW
forces the minimum threshold to 30A and “Configuration”error is displayed.
WARNING: It is possible to disable the trip control of the protection (“Enable Trip: Off”).
In that case, for the whole duration of the unbalance the CB will not be opened, but only the condition will be
signaled by means of the “warning” LED lit up and a warning message.
2.6.8.1. Zone selectivity “G”
2.6.8.2. Zone selectivity “G”
Zone selectivity “G” can be active at the same time as zone selectivity “S”.
Zone selectivity “G” can be active at the same time as zone selectivity “S”.
2.6.9. Protection "Gext"
Also called “Source Ground return”, this can be carried out when there is the need to check operation of a machine (transformer,
generator or motor etc.) which has star-configured windings.
The protection is assured by physically positioning an external toroid on the cable connected from the star center of the machine
to the earthing connection point.
The induced current on the winding of the toroid is proportional to the fault current which, in this case, only transits in the above-
mentioned toroid
The presence of sensor SGR must be activated via the menu, in the Settings-Circuit-breaker-Earth Protection section.
The minimum threshold setting for protection Gext is 0.1xIn (the In settings are 100, 250, 400, 800A) with SW version  2.05.
Adjustment up to 0.1In is available with Vaux present. In the absence of Vaux, the minimum adjustment becomes 0.2In
Protection Gext possesses the same adjustment characteristics as protection G and is controlled differently by relays PR122/P
and PR123/P.
- PR122/P: only one protection can be set: if both are enabled, activation of Gext excludes G.
- PR123/P: available at the same time. Activation of Gext does not exclude G.
WARNING: The external toroid must be connected to the relay with shielded stranded two-wire cable (such as
BELDEN 3105A two-wire cable) no longer than 15 m. The shield must be earthed on both the circuit-breaker side
and toroid side.
It is indispensable for the star center to be connected openly to earth and for it not to be used as a neutral conductor too (as in
the TNC system), making a protection according to the TT system.
2.6.9.1. Start-up threshold “Gext"
The function behaves in exactly the same way as the protection “S”
2.6.9.2. Zone selectivity “Gext"
Moreover, Zone selectivity Gext is controlled in different ways by relays PR122/P and PR123/P.
- PR122/P: similarly to the protection, one single selectivity can be set, either G or Gext. If both are enabled, activation of Gext
excludes G.

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- PR123/P: selectivity G and Gext are available at the same time. Activation of Gext does not exclude G.
WARNING: With relay PR123/P and if both selectivity G and Gext are activated, input K51/GZin and output K51/
GZout are shared: the commands and time settings are determined by the settings of the 2 selectivity options
and just one of the two need be activated in order to activate the inputs and outputs (e.g.: output K51/GZout is
activated if the fault current exceeds one of the two protection thresholds).
2.6.10. Protection Gext (Idn) / Residual current protection Rc
Protection Rc provides protection against earth faults of the residual current type.
The protection, which can be adjusted, allows the operating threshold and non-trip time settings to be made (the trip fails to occur
if the alarm terminates within the set time).
The presence of sensor Rc must be activated via the menu, in the Settings-Circuit-breaker-Earth Protection section.
WARNING: It is essential to enable the protection after the dedicated rating plug has been installed and with the
PR120/V module connected to the relay.
The function is available for the pertinent versions of relays PR122/P and PR123/P, and only in the presence of:
- module PR120/V
- external sensor Rc
- relay configured with dedicated rating plug for residual current protection.
Rating plugs for residual current protection have a different label from the ordinary model, indicating the sensitivity range and
non-trip time settings that characterize the function.
(tar)
, ,
The protection is controlled in different ways by relays PR122/P and PR123/P:
- PR122/P LSIG: only one protection can be set, either Rc or G: if both are enabled, activation of Rc
excludes G.
- PR123/P LSIG: available at the same time. Activa- tion of Rc does not exclude G.
Two toroid models are available. The “small” toroid can be installed on three-pole models E1 and E2, while the “medium” can be
installed on four-pole models E1 and E2, and on three-pole model E3.
WARNING: The protection is inhibited for current values over the maximum rated current value of the circuit-
breaker model on which the protection unit is installed, according to the following criteria:
- CB E2 : inhibition for current values exceeding 2000A with tolerance [0...+10%]
- CB E3 : inhibition for current values exceeding 3200A with tolerance [0...+10%]
Instructions on how to put the configuration with sensor Rc into service are available in par. 2.12.7.
Details about the sensory chain test with Rc are available in par. 2.10.3.
2.6.11. Protection "U"
The excludable fixed time protection allows phase voltage or current unbalance to be monitored.
Voltage unbalance can only be monitored if module PR120/V is installed.
This fixed time, excludable protection trips when, for the t6 time setting or longer, an unbalance is detected between two or more
phases that is higher than the I6 threshold setting.
The percentage of current unbalance is calculated in the following way:
% Unbal = 100
max
min
max .
−
I
I
I
where Imax is the maximum and Imin the minimum phase current.
Unbalance percentage is calculated as follows
)
,
,
(
)
,
,
(
31
23
12
31
23
12
i
V
V
V
d
Mean
V
V
V
d
Voltage unbalance =
i
Max. deviation from mean
.
Besides normal time delay and trip operation, the protection setting for voltage monitoring can, with Vaux or powering via the
PR120/V module, be in such a state of alarm as to be unable to activate the immediate trip: this is because the voltage fault may
persist even when the circuit-breaker is open. In view of the alarm state, the opening command is transmitted immediately when
circuit-breaker closing or the passage of current are detected.
The trip command of the protection can be disabled: in this case, CB opening is not controlled and the condition is merely
signalled by leds and a message on the display.

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WARNING: When the value of the phase current is above 6xIn, the function “U” excludes itself because, in this
case, the other protections intervene because the fault is considered as a phase fault.
The protection is not enabled for maximum phase current values lower than 0.3xIn.
2.6.12. Protection “UV”
The excludable, fixed time (t=k), adjustable protection is activated with both self-supply and auxiliary power:
When the minimum phase voltage drops below the set threshold U8 the protection counts down the preset time interval t8 and
then opens.
As already described for protection U, the function acts in the same way if an Alarm occurs (opening depending on the state of
the CB and the presence of current) and the trip can be disabled.
2.6.13. Protection "OV"
When the maximum phase voltage exceeds the set threshold U9 the protection counts down the preset time interval t9 and then
opens.
2.6.14. Protection "RV"
When the residual voltage exceeds the set threshold U10 the protection counts down the preset time interval t10 and then opens.
The residual voltage U0 is calculated by vectorially summing the phase voltages. It is therefore defined by the following formula.
3
2
1
0 U
U
U
U +
+
=
This protection is available on 4-pole or 3-pole CBs with neutral voltage available (see circuit diagram 48). On 3-pole CBs, pres-
ence of neutral voltage must be set by the “neutral voltage present” parameter.
2.6.15. Protection "RP"
When the total reverse active power (sum of the power of the 3 phases) exceeds the set reverse active power threshold P11 the
protection counts down the preset time interval t11 and then opens.
The minus sign (‘-’) in front of the threshold and power indicates reverse power. The threshold is indicated as a percentage of
“Pn”, where “Pn” is the rated power of the circuit-breaker (3 Vn*In).
2.6.16. Protection "UF" and "OF"
The frequency protections detect variations in the network frequency above (f12, t12) or below (f13, t13) an adjustable threshold,
thereby generating an alarm or opening the circuit-breaker.
2.6.17. Protection "T"
There is a sensor inside the PR122/P and PR123/P unit that monitors the temperature of the unit.
This enables the signalling of any abnormal temperature conditions, which could cause temporary or continuous malfunctions
of the unit’s electronic components.
This protection has two states of operation:
State of “WARNING TEMPERATURE” with –25°C < temp. < -20°C or 70°C < temp. < 85°C :
the display is turned off and the “WARNING” LED flashes at 0.5Hz
State of “ALARM TEMPERATURE” with temp.  –25°C or temp.  85°C :
the display is turned off, the “WARNING” and “ALARM” Leds flash at 2Hz and the Trip is activated (if enabled by means of the
“Over Temper. Trip = On” parameter).
In the event of Warning and Alarm, the display is turned off, to preserve its functionality;
The monitored temperature is not visible on the display.

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The protection is always active, both with auxiliary supply and in self-supply.
WARNING: Disabling the Trip control of the protection means that the PR122/P unit could work, with the circuit-
breaker closed, in a range of temperatures where correct operation of the electronics is not guaranteed.
2.6.18. Load control function
Single loads can be enabled/disabled on the load side before the overload protection L intervenes and trips the circuit-breaker
on the supply side. This is done by contactors or switch-disconnectors (wired outside the release), controlled by the PR122/P by
means of contacts on the PR120/K module or on the PR021/K external unit.
The current thresholds are lower than those available with the protection L, so that the load control can be used to prevent trip-
ping due to overloads. The function is active when an auxiliary power supply is present, or supply from PR120/V (see par. 15.1.4).
The operating logic involves the activation of three contacts when the preset thresholds LC1, LC2 and Iw are exceeded.
Thresholds LC1 and LC2 are expressed as a percentage of I1 (current threshold specified for protection L) while the “warning
current” Iw is expressed as an absolute value. The allowable values are given in the following table:
Threshold LC1 50%...100% x I1 step 1% I1
Threshold LC2 50%...100% x I1 step 1% I1
Threshold Iw 0,3 ...10,0 x In step 0,05 In
From the PR122/P you can associate each of the PR120/K or PR121/K contacts with a configuration (NO or NC), a delay and
the eventual latch.
2.6.19. Double protection set
Relay PR123/P allows a second set of protections to be configured.
Activation of the “Dual Set“ function in the Settings-Dual set menu allows the operator to configure a second set of all the avail-
able protections, called Set B. The event for automatic set change-over can also be associated in the settings menu.
If Dual Set is enabled, the protections menu will present a new level, where the Set to be viewed or whose parameters must be
edited can be selected. (Set A and Set B)
The operator can switch from set A to set B when there is a change in the network configuration or when there is an emergency
capable of changing the load capacity and short-circuit levels.
The automatic event that can be selected by the user for automatic set change-over can be:
- Activation of the digital input of module PR120/K (activation of the input enables the change of state).
- Change of state of the CB (when there is a change of state from open to closed, the second protection set is activated for a
programmed time). This function also includes adjustment of the time the second set must remain activated after closing. The
main set returns after this time has elapsed).
- Presence of Vaux (the second set of protections activates in the presence of Vaux).
The set can also be edited by the user via the display or by means of a communication module.
2.6.20. Neutral Protection
Relays PR122/P and PR123/P allow the current signal of the neutral pole to be processed with different ratios in relation to the
value of the phases. The following values can be set for this protection: InN =Off - 50% - 100% - 150% - 200% * In.
The adjustments can be made via the menu in the Settings-Circuit-breaker-Neutral Protection section.
Regulation of the neutral value (InN) must conform to the following formula: (I1 x InN) Iu.
The relay performs the test automatically for four-pole circuit-breakers and transmits a fault signal following failure to conform to
this formula. If the circuit-breaker is the three-pole type with external neutral, no tests will be performed by the relay and correc-
tion of the settings is at the user's charge.
E.g.: With CB E1B800 (Iu=800A), Rating plug 400A (In=400A) and I1=1In, the InN setting could be: 50-100--150-200% .
With CB E1B800 (Iu=800A), Rating plug 800A (In=800A) and I1=1In, the InN could be: 50-100%.
The I1=1In setting is the maximum setting of the protection against overload. The real permissible maximum setting setting must
take account of derating due to the temperature, the terminals used and the altitude, or In (rating plug) 50% of the size of the
circuit-breaker.
WARNING: In some installations, where particularly high harmonics occur, the current circulating on the neutral
may be higher than that of the phases.
WARNING: For three-pole circuit-breakers without external neutral, the Neutral protection setting must be OFF,
otherwise the sensor presence error will be signalled (Error CS).
In these cases, short-circuit T5-T6 on the sliding contacts, as shown in the wiring diagrams.
WARNING: Failure to comply with the setting limits for “I1” and “InN” can cause circuit-breaker damage with
consequent risks even for the operator.

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WARNING: the protection setting is automatically 100% when the current value exceeds 15.5xIn on the neutral.
2.6.21. Protection against instantaneous short-circuit “Iinst”
The purpose of this protection is to maintain the integrity of the circuit-breaker and installation in the case of particularly high
current values requiring shorter reaction times than those provided by the instantaneous short-circuit-protection.
The protection cannot be disabled. It has a single fixed time protection curve and the threshold level is exclusively at the charge
of ABB personnel.
2.6.22. Summary table of the protection function settings for PR122 and PR123/P
Current
protections
PR122/P
PR123/P
Disabling
Disabling
of
TRIP
only
Zone
selectivity
Start-up
threshold
Thermal
memory
Trip Threshold Trip time
Trip
threshold
tolerance (2)
Trip time
tolerance (2)
L
all curves:
t=k/I2 and
IEC 60255-3
      
0,4xIn  I1  1xIn
step 0,01xIn
3s  t1  144s(1)
, step 3s
@If=3I1
Releasebe-
tween 1,05
and 1,2 xI1
±10%, If  6In
±20%, If 6In
S
(t=k)
      
0,6xIn  I2 10xIn
step 0,1xIn
0,6xIn  I2 start-up
10xIn
step 0,1xIn
If>I2
0,05s  t2  0,8s, step 0,01s
0,10s  t2 start-up  30s, step
0,01s
0,04s  t2 sel  0,2s, step 0,01s
±7%, If  6In
±10%, If > 6In
The best of the
two data±10%
or 40ms
S
(t=k/I2
)
      
0,6xIn  I2 10xIn
step 0,1xIn
0,05s  t2 0,8s,
step 0,01 s @If=10In
±7%, If  6In
±10%, If > 6In
±15%, If  6In
±20%, If 6In
S2
(t=k)
      
0,6xIn  I2 10xIn
step 0,1xIn
@If>I2
0,05s  t2 0,8s, step 0,01s
0,01s
0,04s  t2 sel  0,4s, step 0,05s
±7%, If  6In
±10%, If > 6In
The best of the two
data
±10% or
40ms
D
(t=k)
      
0,6xIn  I7 10xIn
step 0,1xIn
@If>I7
0,20s  t7 0,8s, step 0,01s
0,01s
0,13s  t7 sel  0,5s, step 0,01s
±10%
The best of the
two data±10%
or 40ms
I
(t=k)
      
1,5xIn  I3 15xIn
step 0,1xIn
1,5xIn  I3 Start-Up 
15x In
 30 ms
0,01s
@ If>I3
±10%
MCR
(t=k)
      
6,0xIn  I5 15xIn
step 0,1xIn
@If>I5
 30ms(3) ±10%
G(4) (6)
(t=k)
      
0,1xIn  I4 1xIn
step 0,02xIn
0,1s  t4 1s, step 0,05 s
0,1s t4 start-up  1s, step 0,02s
0,04s  t4 sel  0,2s, step 0,01s
@ If>I4
±7%
The best of the
two data±10%
or 40ms
G(4) (6)
(t=k/I2
)
      
step 0,02xIn
0,2xIn  I4 Start-Up 
1x I4
0,1s  t4  1s, step 0,05s
(minimum trip time)
@If>4In
±7% ±15%
Gext (6)
(t=k)
      
step 0,02xIn
@If>I4
0,1s  t4  1s, step 0,05 s
0,02s
0,04s  t4 sel  0,2s, step 0,01s
±7%
The best of the
two data±10%
or 40ms
Gext (6)
(t=k/I2
)
      
step 0,02xIn
0,1s  t4  1s, step 0,05s
(minimum trip time)
@If>4In
±7% ±15%
Rc (Idn)       
Idn =3-5-7-10-20-
30A
0,06-0,1-0,2-0,3-0,4-0,5-
0,8s(3) -20%  0 0,06s(5)

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Current
protections
PR122/P
PR123/P
Disabling
Disabling
of
TRIP
only
Zone
selectivity
Start-up
threshold
Thermal
memory
Trip Threshold Trip time
Trip
threshold
tolerance (2)
Trip time
tolerance (2)
U
(t=k)
      
2%  I6  90%
step 1%
0,5s  t6  60s, step 0,5s ±10%
The best of the
two data±10%
or 40ms
OT
(temp=k)
      
Fixed, defined by
ABB SACE
Instantaneous ± 5°C
Iinst       
Automatic, defined
by ABB SACE
Instantaneous
UV
(t=k)
      
0,5xUn  U8 
0,95xUn
step 0,01xUn
0,1 s  t8  5 s, step 0,1 s ± 5%
The best of the
two data±10%
or 40ms
OV
(t=k)
      
1,05xUn  U9 
1,2xUn
step 0,01xUn
0,1 s  t9  5 s, step 0,1 s ± 5%
The best of the
two data±10%
or 40ms
RV
(t=k)
      
0,1xUn  U10 
0,4xUn
step 0,05 Un
0,5 s  t10  30 s, step 0,5 s ± 5%
The best of the
two data±10%
or 40ms
RP
(t=k)
      
- 0,3xPn  P11 
-0,1xPn
step 0,02 Pn
0,5 s  t11  25 s, step 0,1 s ± 5%
The best of the
two data± 10%
o 40 ms
UF       
0,9fn  f12  0,99fn
step 0,01 fn
0,5 s  t12  3 s, step 0,1 s ± 5%
The best of the
two data±10%
or 40ms
OF       
1,01fn  f13  1,1fn
step 0,01 fn
0,5 s  t13  3 s, step 0,1 s ± 5%
The best of the
two data±10%
or 40ms
LC1/LC2
load Control
      
50%100% step
1%xI1
Warning Iw        0,310In step 0,05xIn ± 10% 1040 ms
(1)
The minimum value of this trip is 1s regardless of the type of curve set
(self-protection).
(2)
These tolerances are based on the following assumptions:
- Self-powered relay (no start-up) with 2 or 3 supplied phases
and/or in presence of auxiliary supply.
- Preset trip time  100 ms.
- Temperatura e correnti entro i limiti di funzionamento.
(3)
No-trip time.
(4)
La protezione G può essere disabilitata automaticamente dal relè in
funzione della corrente misurata. Per le casistiche see par. 2.6.8.
(5)
Max trip time.
(6)
La soglia minima delle protezioni G e Gext, in assenza di Vaux diventa
0,2In.
For all cases not covered by the above hypotheses, the following tolerance
values apply:
Protection Trip threshold Trip time
L
Release between
1,05 e 1,25 x I1
± 20%
S ± 10% ± 20%
I ± 15%  60ms
G ± 10% ± 20%
Others ± 20%

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2.6.23. Trip curves
The trip curves given are for guidance and only show a sub-group of the possible selections.
2.6.23.1. Trip curves for functions L-I
t [s]
10-1
10-2
1
10
102
103
104
10-3
1 10 100
10-1
x In
0,4 1
0,4 … 1
1,5 … 15
1,5 15
3 … 144
L
I
2.6.23.2. Trip curves for functions L-S(t=k/I2
)-I
t [s]
10-1
10-2
1
10
102
103
104
10-3
1 10 100
10-1
x In
0,4 1
1,5 15
1,5 ... 15
0,6 10
0,6 ... 10
0,05 ... 0,8
0,4 ...1
3 ... 144
L
I
S
t=
k
I
2

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2.6.23.3. Trip curves for functions L-S(t=k)-I
t [s]
10-1
10-2
1
10
102
103
104
10-3
1 10 100
10-1
x In
0,4 1
0,4 … 1
1,5 … 15
0,6 10
0,6 … 10
0,05 … 0,8
1,5 15
3 … 144
L
I
S
t=k
2.6.23.4. Trip curves for function L in accordance with IEC 60255-3 (type A)
t [s]
10-1
1
10
102
103
104
10-1
1 10 100
x In
3 … 144
0,4 … 1
0,4 1
L
k=0,14
α=0,02

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2.6.23.5. Trip curves for function L in accordance with IEC 60255-3 (type B)
t [s]
10-1
1
10
102
103
104
1 10 100
10-1
x In
0,4 … 1
1
0,4
3 … 144
L
k=13,5
α=1
2.6.23.6. Trip curves for function L in accordance with IEC 60255-3 (type C)
t [s]
10-1
1
10
102
103
104
1 10 100
10-1
x In
0,4 … 1
0,4 1
3 … 144
L
k=80
α=2

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2.6.23.7. Trip curves for function G
2.6.23.8. Trip curves for function D
t [s]
1 10 100
1
10
102
103
104
10-2
x In
10-1
10 -1
D
10
0,2 . . .0,8
0,6 10
0,6 . . .10

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2.6.23.9. Trip curves for function U
t [s]
1 10
10-1
1
10
102
103
104
10 -2
x In
10 -1
0,02
0,5
10
0,5 … 60
0,9
60
0,02 … 0,9
U
2.6.23.10. Trip curves for function UV
t [s]
10-1
10-2
1
10
102
103
104
0,3 0,5 0,7 0,9 1,1 1,3
x Un
0,1
0,5 0,95
0,5 … 0,95
10
0,1 … 5
5
UV

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2.6.23.11. Trip curves for function OV
t [s]
10-1
10-2
1
10
102
103
104
1 1,05 1,1 1,15 1,2 1,25 1,3
x Un
1,05 … 1,2
10
0,1 … 5
1,05 1,2
0,1
5
OV
2.6.23.12. Trip curves for function RV
t [s]
10-1
1
10
102
103
104
0 0,2 0,4 0,6 0,8 1
x Un
1,2
10
0,5 … 30
0,5
0,1 0,4
30
0,1 … 0,4
RV

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2.6.23.13. Trip curves for function RP
t [s]
10-1
1
10
102
103
104
-0,1
x Pn
0
-0,3
-0,4 -0,2
10
0,5 … 25
0,5
25
-0,3 -0,1
-0,3 … -0,1
RP
2.7. Measuring functions
Relays PR122/P and PR123/P include various different measuring functions.
The basic measurements available in all models are:
- Currents: three phases (L1, L2, L3), neutral (N) and earth fault
- Trips (last 20) and events (last 80)
- Log register: storage of maximum current reading (with the date and time of recording)
- Peak factors: three phases (L1, L2, L3) and neutral (N)
- Percentage of contact wear.
In the configuration with module PR120/V, relays PR123/P and PR122/P provide further measurements:
- Voltage: line-to-line, line-to-neutral and residual voltage
- Power: active, reactive, apparent
- Log register: storage of maximum and minimum voltage and power readings (with the date and time of recording)
- Power factor
- Energy: active, reactive, apparent
- Network frequency
Relay PR123/P includes a further measurement function:
- Wave forms: network voltages and phase currents, and harmonic analysis.

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2.7.1. Runtime measurements: current, voltage, power
The main current, voltage and power measurements can be accessed by using the UP and DOWN buttons from the default page.
In the default page, histograms with the currents and voltages appear on the display, while the value and the highest phase are
also given in the numerical format.
The available current and voltage measurements depend on the version and configuration of the CB and relay.
Currents:
- Three-pole CB: phase currents I1, I2, I3 are available
- Three-pole CB, configuration with external neutral (3P+N): phase currents I1, I2, I3, Ine are available
- Four-pole CB: phase currents I1, I2, I3, Ine are available
- Relay in the LSIG version: Ig measurement available.
- Relay in the LSIG version and presence of the SGR sensor: Ige measurement available.
- Relay in the LSIG or LSIRc version (PR122/P) and presence of the Rc sensor: Ige measurement available (to be considered as
residual current).
Voltages (In the presence of the PR120/V module):
- Three-pole CB without neutral: network voltages V12, V23, V13 and the total powers available (active, reactive, apparent).
- Three-pole CB, with neutral PRESENT Voltage option: network voltages V12, V23, V13, phase voltages V1, V2, V3, V0 and the
powers (active, reactive, apparent) of each phase and total powers available.
- Four-pole CB: network voltages V12, V23, V13, phase voltages V1, V2, V3, V0 and the powers (active, reactive, apparent) of
each phase and total powers available.
The runtime measurement tolerance margins are:
Type of measurement range Range of values
measured by the relay
Standard operation
Range Tolerance %
Phase and neutral currents 0,05 ... 16In 0,3 ... 6 In ± 1,5
Internal ground fault current 0,05 ... 16In 4In 0,3 ... 4 In ± 1,5
External ground fault current (external source
round return)
0,05 ... 4In 0,3 ... 4 In ± 1,5
Phase-to-phase and phase voltages (meas-
ured at the module’s input and thus inde-
pendent of the precisionrelating to the use of
any VT
10Vconc ... 1,1 x 690Vconc 50 Vconc ... 1,1x690 Vconc ± 1
Residual voltage(for systems with neutral
only)
10Vconc ... 1,1 x 690Vconc 50 Vconc ... 1,1x690 Vconc ± 1
Instantaneous active powersingle phase and
total system
0,02 ... 16Pn 0,3 ... 6 Pn ± 2,5
Instantaneous reactive power single phase
and total system
0,02 ... 16Pn 0,3 ... 6 Pn ± 2,5
Instantaneous apparent power single phase
and total system
0,02 ... 16Pn 0,3 ... 6 Pn ± 2,5
2.7.2. Trip
The list of trips recorded by the relay is available in the Measurements-Log Files-Openings section. Information about the last trip
is also available from the main page by pressing the iTest button three times.
Each trip is recorded with useful information enabling it to be identified:
n. 02
L Protection
I1: 625 A I3: 623 A
I2: 617 A Ne: > 10.0 kA
Jan 06, 2004 08:52:11:733
Last Trip Numero del trip:
il nr 01 è il più recente;
Massimo 20 trip
Correnti registrate nel
momento del trip
Protezione che ha
causato il trip
Data e ora del trip
Use the UP and DOWN buttons to scroll all the trips recorded in the Openings menu.
WARNING: After a trip has occurred, the page concerning the recorded trip appears on the display. Press iTest
to remove it and go back to the main page.
WARNING: With the relay off after a a trip has occurred, press the iTest button to display the page concerning
the recorded trip for a few seconds. The function remains valid for 48h from shut-down thanks to a capacitor
inside the relay.

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2.7.3. Events
The list of events recorded by the relay is available in the Measurements-Log Files-Events section.
The page of each event is similar to that of the trips, with a description of the event instead of the message about the protection
and numbering that refers to the last event recorded (Last, Last-1, Last-2,...).
Relays PR122/P and PR123/P are able to record up to 80 events. Use the UP and DOWN buttons to scroll all the events.
2.7.4. Measurements Log register
Relays PR122/P and PR123/P can record various different measurements and allow the recording time to be set between one
measurement and the next.
The measurements are available in the Measurements-Log Files-Measurements section:
Name Available with Description
I Max PR123/P; PR122/P Rms value and maximum current phase
P Max PR123/P; PR122/P (with PR120/V) Maximum active power
P Mean PR123/P; PR122/P (with PR120/V) Mean active power
V Max PR123/P; PR122/P (with PR120/V) Rms value and maximum network voltage phase
V Min PR123/P; PR122/P (with PR120/V) Rms value and minimum network voltage phase
Reset meas-
urements
PR123/P; PR122/P Meter reset command
Each measurement available is shown on the display by a graphic page:
Data e Ora della misura registrata
Valore della misura
selezionata
Tipo di Misura
Tempo di registrazione impostato
Rappresentazione grafico delle ultime 25 misure
La misura selezionata lampeggia
Use the UP and DOWN buttons to scroll all the recordings of each measurement.
Select the Measurement reset command to reset all the recordings.
The recording time can be adjusted in the Settings-Measurement interval menu.
2.7.5. Power factor
Relays PR123/P and PR122/P (configured with the PR120/V module) provide the overall power factor in the Measurements-Power
factor section.
Standard operation
Range Tollerance %
Total power factor 0,1 ... 1 0,5 ... 1 ± 2,5
WARNING: If the phase power is less than 2% (0.02xPnphase) the value is not displayed and is substituted by ‘…..’.
2.7.6. Energy
Relays PR123/P and PR122/P (configured with the PR120/V module) measure total active, reactive and apparent energy of the
system. 0.001 MWh, 0.001 MVARh or 0.001MVAh are the minimum values that can be displayed.
The meter can be reset by confirming the “Reset meters” menu item in the page.
Standard operation
Range Tollerance %
Active energy 0,02 ... 16 Pn 0,3 ... 6 Pn ± 2,5
Reactive energy 0,02 ... 16 Pn 0,3 ... 6 Pn ± 2,5
Apparent energy 0,02 ... 16 Pn 0,3 ... 6 Pn ± 2,5
2.7.7. Peak factor
The peak factor measurement, a ratio between Ipeak / Irms is available for each current phase.
The measurement is not displayed if the current is less than 0.3xIn and is not available for currents exceeding 6xIn.
Standard operation
Range Tolerance %
Peak factor 0,3 ... 6 In 0,3 ... 6 In ± 1,5

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2.7.8. Mains frequency
Relays PR123/P and PR122/P (with module PR120/V) measure the network frequency. This is calculated on the basis of the
voltage (if Umax > 0.1Un).
The measurement is guaranteed after up to 5 s from the frequency variation.
Standard operation
Range Tolerance %
Mains frequency 35 ... 80 Hz 45 ... 66 Hz ± 0,2
2.7.9. Contact wear
This sub-menu displays the percentage of wear on the CB contacts.
2.7.10. Wave forms
Relay PR123/P provides a further measurement function, which is useful for the harmonic analysis of phase currents and network
voltages.
The Measurements-Wave forms menu allows the operator to select from amongst 8 measurements (currents L1, L2, L3, Ne, gt,
voltages V12, V23, V31). The graphic representation of the wave form chosen (120 samples) is displayed once the measurement
has been selected:
I1 = - - -
Press ENTER to access the selected wave form menu, where acquisition can be updated (Refresh command) or an area opened
for harmonic analysis of the wave form (Harmonics command).
The Harmonics area gives the graphic representation of the module with the 1st to 40th harmonics (up to the 35th for 60 Hz
network frequency settings) given in percentage of the fundamental harmonic (1st harmonic), thus always indicated at 100%.
Total distorsion : 150.0 %
Harmonic n. 1/40 : 100.0 %
Ne
Misura selezionata
Rappresentazione grafica delle armoniche
L’armonica selezionata lampeggia
Armonica selezionata
Distorsione armonica percentuale totale
Distorsione percentuale
dell’armonica selezionata
Use the UP and DOWN keys to move to the required bar and read the corresponding percentage value.
The measuring accuracy is 5%.
2.8. Main functions
2.8.1. Watchdog
The PR122/P and PR123/P unit provides some watchdog functions able to guarantee the proper management of relay malfunc-
tions. These functions are as follows:
- Watchdog for presence of Auxiliary power supply with “plug” icon displayed.
- RATING PLUG validity.
- Watchdog for proper connection of the current sensors (CS). If it is enabled, any anomalies are indicated by a special alarm
message and the “alarm” LED coming on, and the circuit-breaker opens after 1s.
- Watchdog for proper connection of the Trip Coil (TC). If it is enabled, any anomalies are indicated by a special alarm message
and the “alarm” LED coming on; if the PR120/D-M module is installed, this activates the coil opening command (YO), thus
opening the CB.
- Watchdog for protection of Hw Trip. If it is enabled, in the event of the sensors being disconnected or a Rating Plug error, a CB
opening command is given by the TC being enabled.
2.8.2. Circuit-breaker state
Relays PR122/P and PR123/P detect the state of the circuit-breaker by means of specific wiring in the CB itself. When the pres-
ence of current is detected with the circuit-breaker “OPEN”, state error is signalled by means of a warning message and the
“warning” led comes on.
2.8.3. Datalogger
Relays PR122/P and PR123/P powered with Vaux, possess a Datalogger function: this function can be used for storing and sav-
ing the instantaneous values of certain analog measurements (7 analog channels) and digital measurements (64 digital events)
in a capacious data buffer.
The data can be easily downloaded from the unit using the available communication units (internal modules PR120/D-M, PR120D-
BT and external modules BT030-USB, Ekip T&P) and transferred to any personal computer for processing.
The function can be associated with relay or CB events or states, thus allowing the measurements to be recorded according to
the desired installation requirements.
The function can be very useful for recording if a trip occurs as it facilitates the subsequent failure analysis.

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2.8.3.1. Settings
All the settings are available in the Settings-Datalogger menu. In detail:
- Function enabling: allows the operator to activate or shut down the function.
- Samplingfrequency:frequencyselectiondeterminesthenumberofmeasurementsamplesaswellasthemaximumrecordingtime.
- Stop source: the stop source establishes the event to which interruption of measurement storage must be associated.
- Stop delay: used for entering a storage delay.
- Restart and Stop: storage interruption and forced start commands.
The maximum data recording times depend on the selected frequency and are illustrated in the following table:
Frequency Recording time
600 Hz 27,3 s
1200 Hz 13,6 s
2400 Hz 6,8 s
4800 Hz 3,4 s
WARNING: Selecting sampling frequency is an important step. In fact, presence of high-order harmonic waves
may cause aliasing on processing of collected data. Use maximum frequency when a harmonic distortion is
available, otherwise data processing may give results which do not match actual system conditions.
ONE one of the following Stop Sources can be selected:
- None
- Any alarm
- L timing
- Any trip
WARNING: If you select “None” for the stop event, the data logger can be stopped only by a stop command from
the operator panel, from the system or following a trip generated by the relay.
You can set customized Stop Sources from the system, to coincide with events (a list of examples is given in the table below)
N° (decimal) Event
1920 Time delay G
2894 sensor L1, L2 or L3 error, or Trip Coil error
2688 LC1 alarm
2049 G alarm
33672 CB connected and springs loaded
1793 Harmonic distortion > 2.1
You can combine the status bits with logical functions “and” or “or” within the same group of events (bytes). Consult the Modbus
Interface document for further details.
The stopping delay can be set from 0.00 [s] to 10.00 [s] with 0.01 [s] steps.
WARNING: If a trip occurs, this data storage process will be stopped after 10 ms, even if a longer stopping
delay has been selected.
2.8.3.2. Recording time windows
The data logger’s measurements are recorded in a time window, the duration of which is defined and synchronized by an event
(trigger/stop event) of your choice.
The following figure displays the time window, the trigger and the samples available in gray:
Stopping
delay
Measurements available
Pretrigger
Samples
1/Freq
Trigger
Recording time
The user can select the sampling frequency, the type of stop trigger event and the stop delay so as to obtain the desired pre-
trigger for the selected event.

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Depending on the set value, the stop delay can be nil, or less or more than the recorded duration, as shown in the figure below:
Stopping delay = 0 Stopping delay < recording time Stopping delay > recording time
Trigger Trigger Trigger
WARNING: If datalogger parameters are changed whilst the datalogger is active, the storage that is in progress
will be terminated and new storage will start on the basis of the new parameters (following a trigger restart
command).
Recording time may be lower than maximum time attainable when the sum of stopping delay and time elapsing between a restart
trigger and a trigger is lower than the maximum value, as described in the figure below:
Recording time
Stopping delay
Restart Trigger Trigger
Maximum recording time
By connecting to the release’s outside bus, you can set certain data logger parameters, triggers or commands, or read certain
types and sequences of data in its memory.
The combinations of devices and the consequent software combinations that enables these functions are as follows:
2.8.3.3. Access to saved data from the system
When the event associated with the stop event occurs or a stop command is received, the following data are saved in the record-
ing block:
- Data logger Trigger, which indicates the type of stop event (trigger) that has prompted the stoppage of the data logger;
- Time-stamp of the stop event (trigger) (day/hour + minutes/seconds/milliseconds)(4 words);
- Data logger max file, which indicates which is the max file with consistent data;
- Data logger max address, which indicates the max address number of a block with consistent data.
The following information is also stored:
- sample of currents L1, L2, L3, Ne
- V12, V23, V31 voltage samples
- digital inputs/outputs (among 16 possible options, e.g. inputs/outputs for Zone Selectivity, PR120/K contact status, ...)
- alarms1 (among 16 possible options, e.g. L timing, G alarm, Prealarm)
- allarmi2 (tra 16 possibili. Es: UF timing, OV timing, Frequency error, RP timing)
- trips (among 16 possible options, e.g. tripping of L, S, I, G, UV, OF, ...).
The recordings are available in the relays for as long as the unit remains on (the data are lost in the absence of Vaux).
Using Ekip Connect SW, the operator can perform a Download so that all the information in the recording can be stored in a single
file (.abb format) and consulted with SD-DataViewer SW.
The next recording will be enabled following a Restart Trigger command.

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2.8.3.4. Example of data logger operation
The following figure shows an example of how a trigger works, the data logger’s function, the effect of the stopping delay and of
the restart and subsequent stop commands on the data saving procedure
Samples
available
Samples
available
Samples
Trigger
Waiting Trigger
Data logger triggered
Data logger stopped
Modbus commands
Stopping delay
Restart Restart
Stop
Data logger enabled
2.8.4. Zone selectivity
Relays PR122/P and PR123/P possess inputs and outputs for the Zone Selectivity function.
Name Type Description
K51/SZin (K51/DFin) Digital input Zone selectivity: input for protection S or “direct” “forward” input for protection
D
K51/Gzin (K51/DBin) Digital input Zone selectivity: input for protection G or “reverse” “backward” direction input
for protection D
K51/SZout (K51/DFout) Digital output Zone selectivity: output for protection S or “direct” “forward” output for protec-
tion D
K51/GZout (K51/DBout) Digital output Zone selectivity: output for protection G or “reverse” “backward” output for
protection D
The various different zone selectivity functions only operate if the relay is equipped with Vaux.
The digital output of each selectivity channel can be connected to up to 20 relays on the supply side in the selectivity chain.
The maximum length of cable for zone selectivity, between two units, is 300 meters. Use corded shielded two-wire cable
(per esempio cavo bifilare BELDEN 8762/8772). The shield must only be earthed on the circuit-breaker of the supply-side relay
(ZSI side).
The operating mode is described in the chapters dedicated to each zone selectivity function: S (par. 2.6.3.3), G (2.6.8.2) and D
(2.6.5.2).
2.9. Settings Menu
The Settings menu contains various different settings concerning relay operation and for configuring the installation in the cor-
rect way.
9 options are available:
Settings Menu Options Description
1. Circuit breaker Enabling and adjustment of the Neutral protection, earth protection and the installation com-
mands
2. Mains frequency Adjustment of the frequency of the installation
3. Modules Monitoring and setting of the internal module characteristics
4. Data Logger Enabling and adjustment of the Datalogger function
5. Dual setting Enabling and setting of the dual set function (available with PR123/P).
6. Measurement interval Adjustment of the measurement interval for the log file
7. Harmonic distortion Activation of the harmonic distortion control (available with PR123/P)
8. System Date, time, language, password settings
9. Display Contrast Adjustment of the display contrast

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2.9.1. Circuit-breaker
This area allows you to:
- Enable the Neutral protection (ON/OFF) and adjust its control level (50%- 100% - 200%). All the details about the operating
mode are given in the description of the Neutral protection, in par. 2.6.19.
- Enable the presence of a sensor on the earth protection line (SGR or Rc). A further option for selecting the sensor model
(100,250,250,800) will be available if the selected sensor is the SGR type. Functions and case reports on use of the earth pro-
tections are illustrated in the chapters that describe protections Gext (par. 2.6.9) and Rc (par. 2.6.10).
- Perform the installation and uninstalling operations for the relay on the CB. Instructions for correct installation are given in par.
2.12.1 and 2.12.2.
2.9.2. Network frequency
This area allows you to enter the frequency of the installation: 50Hz or 60Hz.
Selection of this parameter enables the relay to calibrate its protection and measurement functions as a consequence.
2.9.3. Modules
Relays PR122/P and PR123/P can be connected to 4 internal modules.
The following options are available upon access to the Settings-Modules menu:
- 3 menus dedicated to modules PR120/V (MEASURING Module menu), PR120/D-M (COM Module), PR120/K (SIGNALLING
Module). The menus are available once the modules have been correctly connected and installed.
- Menu for setting the presence/absence of a unit on the Local Bis. Enabling activates a presence monitoring function regarding
a unit on the local bus so as to ascertain whether the connection is correct and to signal any communication alarms.
All the details are given in the chapters with the characteristics of internal modules PR120/V, PR120/D-M, PR120/K.
2.9.4. Datalogger
Relays PR122/P and PR123/P support Dataloggger storage functions. On accessing the Settings-Datalogger menu, the operator
can edit all the parameters of the function and enable or inhibit recording in the manual mode. More details in par. 2.8.3.
2.9.5. Dual Set
Relay PR123/P allows the user to enable the dual protection function. All the parameters of the function can be enabled and
edited on access to the Settings-Dual Set menu. More details in par. 2.6.18.
2.9.6. Measurement Interval
The storage time for the measurements log file can be adjusted in the Settings-Measurement Interval menu. Further details about
the measurements function are given in par. 2.7.4.
2.9.7. Harmonic distortion
The harmonic distortion monitoring function can be activated in the Settings-Harmonic Dist. menu: if activated and if the value
is more thann 2.1, a fault will be signalled on the display.
2.9.8. System
The date and time of the relay, the Language and Password can be adjusted in the Settings-System menu.
2.9.8.1. Language
When selecting the system language, make sure that:
- the relay is set to the local mode (if PR120/D-M is installed);
- the CB is open;
- Vaux 24Vdc and/or busbar voltage by means of PR120/V and/or PR030/B are present.
The relay will not allow the language to be changed in the absence of one of the above conditions.
2.9.8.2. Password
Relays PR122/P and PR123/P are supplied with the default password: 0001.
The password, which is required if all the modifications to the protections or settings in the relay are to be saved, can be changed
in the Settings-System-New Password menu.
The values that can be used in the password range from 0000 to 9999. The default password is given in par. 2.13.
To change the PW, first enter the old one, then select the 4 new figures: the value of each figure can be chosen with the UP and
DOWN keys. Use ENTER to confirm the figure and pass on to the next one.
The password is checked after the fourth figure has been entered. The procedure will change from the “READ” state to the “EDIT”
state if the password is correct.
The password prompt is disabled by setting the value of the password to [0000] (in the “System Configuration” menu). It is
therefore always possible to switch from “READ” to “EDIT”.
WARNING: The password is valid for up to two minutes from the last time a key was pressed. After that time, it must be
entered again so as to validate any changes or to access the menus.
2.9.9. Display contrast
The degree of contrast on the display can be adjusted in the Settings-Display Contrast menu.

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2.10. Test Menu
The Test menu provides various options for checking the relay and CB.
Up to 7 options are available:
Name Description
1. CB status allows the user to view the CB state read by the relay.
2. Auto Test allows the display and led test to be performed
3. Trip test allows an opening command to be transmitted to the CB
4. Gext( Idn) test allows the operation of the Rc sensor to be checked
5. Zone selectivity verification of the zone selectivity inputs and outputs
6. COM module allows the contacts and controls of the CB to be checked
7. SIGNALLING module allows the inputs and contacts of the module to be checked
The test menus of the modules and sensor Gext (Idn) are available if the accessories are connected and configured correctly in
the relay.
2.10.1. Autotest
When autotest is activated, the display and leds will perform a test procedure allowing the user to check the state of the display
and operation of the leds themselves.
The procedure lasts several seconds and the sequence is as follows:
Phase ALARM and WARNING
leds Display
1 On and fixed ABBlogo,thewords“ABBSaceSpa“andamessagewiththenameoftherelay,“PR122/P“
or “PR123/P“
2 Off Flashing backlighting (only if Vaux is present)
3 Normal operation Contrast from 100% (display dark) to 0% (display light), after which the ABB words and
logo reappear
The test result and assessment are at the user's discretion. Inform ABB if faults occur (Leds fail to function, display areas that
fail to function correctly).
2.10.2. Trip test
The state of CB opening can be checked by activating the trip test.
The relay transmits a command to the TC, which activates a CB opening mechanism. A positive test result is shown by the
circuit-breaker opening.
WARNING: To perform the trip test, there must be no current circulating and the CB must be closed (failing this, the
Exception 6 error will appear).
2.10.3. Rc Test
The test option for the Rc sensor is available if the Rc sensor is present and correctly configured in the other menus of the relay.
To test the Rc sensor, select the Gext (Idn) test option from the test menu: the Rc test page will appear. Press the “iTest” key
again to perform the test.
A positive result will be indicated by the circuit-breaker opening within the previous entered time limits.
The test page for the Rc protection can also be accessed by pressing the “iTest” key for 7 seconds from the default page.
2.10.4. Zone selectivity
The menu is divided as to type of selectivity (S and G). For both selectivity types, the user can:
- View the state of the inputs
- Force and release the outputs
WARNING: The override test for the selectivity outputs must be performed with the CB open: the Exception 6 error will
appear if the CB is closed or undefined.
If the CB is withdrawable, perform the test in the inserted or test position.
State assessment is at the user's discretion.
2.10.5. COM module
The option is available if the PR120/D-M module is present and configured correctly.
Within the menu, the operator can:
- View the state of the springs and the position of the CB
- Send CB opening and closing commands (by means of the opening and closing coils)
WARNING: The commands will activate if the module has been connected to the opening and closing coils correct,
and is in the Inserted position.
The test result is at the user's charge: the relay only transmits commands. It does not check the change in state.
Further details about the module are given in par. 2.11.2.

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2.10.6. SIGNALLING module
The option is available if the PR120/K module is present and configured correctly.
Within the menu, the operator can:
- View the state of the input of the module
- Send the contact autotest command (the contacts and leds in the module are activated and disabled in succession).
Checking the inputs and autotest sequence are at the user's discretion.
Further details about the module are given in par. 2.11.3.
2.11. Internal modules
2.11.1. PR120/V - MEASURING Module
Led Power
Isolator
Module PR120/V allows the primary voltages to be read and processed by implementing
a series of protection and measuring functions.
The module also provides energy for powering the relay even in the absence of Vaux, with
nul current or with the CB open.
PR120/V can function with direct connection to the bars of the CB for phase voltage values
of up to 690V. Operation is guaranteed by an external voltage transformer for higher voltage
values and up to 1150V.
The module comes with a “Power” LED and a sealable isolator for dielectric stiffness tests.
The menu in the relay allows various different parameters to be adjusted:
- Rated voltage selection
- TV presence signalling
- Selection of the primary and secondary voltages of the TV
- Power flow setting
- Neutral enabling (only available with three-pole CB)
A further two parameters are available in the menu when the module is installed in PR123/P:
- Phase sequence: sequence control enabling and thresholds
- Cos  measured: control enabing and threshold of the Cos  measured module.
2.11.1.1. Power supply
The PR122/P and PR123/P units are powered by the MEASURING module via the busbar voltage.
The powering stage is capable of operating starting from a voltage of 80 Vrms two-phase phase to phase up to 897 Vrms ( 1.3 *
690 Vrms ) three-phase phase to phase at its input (coming directly from the busbars or from a transformer secondary).
The minimum powering characteristics for the relay in the various configurations are described in par. 2.3.5.2.
2.11.1.2. PR120/V parameters
All the parameters of the PR120/V can be adjusted in the Settings-Modules menu
Parameter Values Notes
Voltage transformer Absent/Present In the absence of the TV, the primary voltage meas-
urement on the display is the one read on the bars.
If the TV is present, the measurement on the display
considers the transformation ratio of the TV estab-
lished by the primary and secondary voltage settings.
Rated Voltage 100V - 115V - 120V - 190V - 208V - 220V - 230V
- 240V - 277V - 347V - 380V - 400V - 415V - 440V -
480V - 500V - 550V - 600V - 660V - 690V
List available with TV Absent
Primary Voltage 100V - 115V - 120V - 190V - 208V - 220V - 230V
- 240V - 277V - 347V - 380V - 400V - 415V - 440V
- 480V - 500V - 550V - 600V - 660V - 690V - 910V -
950V - 1000V - 1150V
List available with TV Present
Secondary voltage 100V - 110V - 115V - 120V - 200V - 230V List available with TV Present
Power flow Bottom Top
Top  Bottom
Protection D setting
Signals (only with
PR123/P)
Enabling status (ON/OFF)
Threshold (123/321)
Enabling status (ON/OFF)
Threshold (from 0,5 to 0,95; step 0,01)

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2.11.1.3. Voltage transformer
In the case of three-phase systems with a rated voltage greater than 690 Vrms phase to phase, a step-down transformer (with
a transformation ratio of less than 1).
Proper operation is only guaranteed for star/star or delta/delta configurations.
The allowable primary and secondary rated voltages that must be set on the unit are specified.
Standard single transformers:
Mechanical characteristics
Fixture DIN rail EN 50022
Material self-extinguishing thermoplastic
Degree of protection IP30
Electrostatic protection shielded towards EARTH
Electrical characteristics
Precision class cl. 0,5
Performance 10VA...20 VA
Overload 20% permanent
Insulation 4 kV between inputs and outputs
4 kV between inputs and outputs
4 kV between inputs and inputs
Operating frequency range from 50 Hz to 60 Hz, ± 10%
The following is a summary table of standard VT connections according to the type of plant.
The VTs must have a performance coming between the values of 10 and 20VA inclusive, 4 kV insulation between the primary
and secondary.
Installation system
"VT Standard" type transformer
(Star/Star)
"VT Standard" type transformer
(Delta/Delta)
Application diagram Application diagram
TN-C B A
TN-S B A
IT with neutral B A
IT n.c A
TT with neutral A B
TT without neutral n.c A
Note for B diagram:
- for TN-C systems the connection must be made to PEN
- for TN-S systems the connection must be made to N for configurations with neutral or PE for configurations without neutral; if
the PE is used, the current thereon could be around a dozen mA. If a customer considers this value too high or has a residual
current protection which risks being tripped, then application diagram A must be used.
- for IT and TT systems with neutral, the connection must be made to N.
Application diagram B
Application diagram A
N
WARNING: The maximum length of the VT - PR120/V wiring must not exceed 15 meters.
Use corded shielded two-wire cable (e.g. BELDEN 3105A two-wire cable).
The shield must be connected to earth on both sides.
WARNING: Dielectric strength tests are not allowed on the inputs and outputs of the releases or on the second-
ary lines of any connected VTs.

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2.11.1.4. Dielectric strength tests
Before performing the dielectric strength test it is essential to turn the isolator into the Test position mode by turning the screw
anticlockwise until you reach the end of stroke position.
WARNING: After performing a dielectric strength test, restore the isolator to its original position by turning it
clockwise until you reach the opposite end of stroke, because all the voltage protections are disabled while the
isolator is in the test position.
At the end of the procedure, make sure that the Power line LED is on.
WARNING: Dielectric strength tests are not allowed on the inputs and outputs of the releases or on the second-
ary lines of any connected VTs.
2.11.2. Module PR120/D-M - COM
Led Power
Led di
Comunicazione
Dedicated communication module for connecting the relay to a Modbus net, and for
remote supervisory and control activities on the circuit-breakers.
The module also allows you to:
- Read certain states of the CB, with reference to the springs and to the position if the
CB is withdrawable.
- There are contacts for managing CB opening and closing commands by means coils
YO and YC.
The module functions with Vaux present.
The module has a “Power” led, which indicates that it is on, and two “Tx“ and “Rx“
communication led to indicate data reception/transmission.
The menu in the relay allows various different parameters to be adjusted:
- Relay configuration (local/remote)
- Communication parameters (baudrate, address, parity)
The communication function with PR120/D-M - COM responds to the Modbus RTU
protocol, using a physical interface of the RS485 type.
All the information required for correct management of the communication with PR120/D-M is given in the Modbus System In-
terface document for the Emax relay (1SDH000566R0002).
2.11.2.1. PR120/D-M parameters
All the communication parameters can be adjusted in the Settings-Modules menu.
Parameter Values Notes
Local/remote Local/remote Local: all changes to the parameters must be made via the menu in
the relay. Only supervision is allowed in the remote mode.
Remote: all changes to the parameters must be made in the remote
mode. Only supervision is allowed via the menu in the relay.
Serial address 1...247; step 1 To avoid conflict in a communication network, it is important to en-
sure that the unit is not configured with the same address.
Baudrate 9600 / 19200bit/s
Physical protocol 8,E,1 - 8,0,1 - 8,N,2 - 8,N,1
Addressing Modbus standard ABB
The parameters can also be edited by means of the PR010/T, BT030-USB and Ekip T&P units.

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2.11.3. Module PR120/K - SIGNALLING
Led Power
Ledcontatti
The module enables the local signalling of alarms and circuit-breaker trips.
The module controls:
- Contacts: up to 4 programmable output contacts (K51/p1, K51/p2, K51/p3 and
K51/p4.)
- Inputs: 1 digital input contact.
There are two possible configurations for the SIGNALLING module:
- default configuration: 1 digital input, 3 contacts with pole in common, 1 independ-
ent contact;
- alternative configuration: 4 independent contacts. In this case, the digital input is
wired.
The two configurations are alternative to each othe.
The module functions with Vaux or is powered by PR120/V.
The module has a “Power” led, which indicates that it is on, and 4 contact leds “1“,
“2”, “3” and “4“, which show the state of the 4 available contacts (Led on = contact
made).
The menu in the relay allows various different parameters to be adjusted so as to
configure contacts and input:
-Contactconfiguration(signalsource,activationdelay,idlestate,self-latchingfunction).
- Input configuration (polarity, function, delay)
2.11.3.1. PR120/K parameters
All the parameters of the contacts and inputs can be adjusted in the Settings-Modules menu.
Contact
name Parameter/Function Values Notes
Relay n. 1
Relay n. 2
Relay n. 3
Relay n. 4
Signal source None/Prealarm L/Time delay L/
Time delay S/Opening L/Opening
S /Opening G/Opening I/Each
opening/Customized
Comply with the indications given for datalogger events
for the customized configuration (See par. 2.8.3).
Delay 0...100s; step 0,01s Deliberate delay before activating the contact
NO/NC NO / NC Contact normally-open (NO) or normally-closed (NC)
Latch ON / OFF With the contact “ON”, once it has been activated it
stays switched. A specific reset action is needed to
reset it
Input Polarità Active low/Active high Consider the input activated for low or high signals
Function Generic - No associated action
Outside trip - Releases the CB
Reset trip - Resets the data after a trip
Set B - Switches from set A to set B (for PR123/P only)
Local - Forces the local status of the protection (local/remote)
Signal reset - Programmable contact reset
Energy reset - Energy meter reset
Delay 0...100s; step 0,01s - Performs action after t is set
The parameters can also be edited by means of the PR010/T, BT030-USB and Ekip T&P units.

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2.11.3.2. Characteristics of the signalling contacts
The following data are defined for resistive loads (cos  = 1)
Parameter Value
Type of contact Single pole (SPST)
Max switching voltage 130 VDC 380 VAC
Max switching current 5 A 8 A
Max switching power 175 W 2000 VA
Breaking capacity at 35 VDC 5 A ----
Breaking capacity at 120 VDC 0,2 A ----
Breaking capacity at 250 VAC ---- 8 A
Breaking capacity at 380 VAC ---- 5,2 A
Contact/coil insulation 4000 Vrms
Contact/contact insulation 1000 Vrms
2.11.3.3. Digital input
The unit allows the digital input to be associated with the various different functions:
The digital input is activated by means of a DC voltage, which must be within the 0-5Vdc range in order to be considered low
and in the 15-28Vdc range to be considered high.
The figure shows two cases, A and B, in which the input’s status is active; in case A the input does not stay valid beyond the
enabling delay so the associated action does not take place, whereas in case B the action takes place after the preset delay.
Times shorter than the delay
Preset delay
Consequent action Action
Input status
2.11.4. Module PR120/D-BT - WL COM
Led Power
Led di
comunicazione
Communication module PR120/D-BT is dedicated to connecting the relay to a Wire-
less network for remote supervisory and control activities on the circuit-breakers.
Communication is based on the Bluetooth standard and allows communuication
between the relay and a portable PC with Bluetooth port. In order for the connection
to be correct, remember that the module's range of action is 10 meters in free air.
The module functions when at least one power supply is present, from amongst: Vaux,
supply via module PR120/V, supply via battery module PR030/B
The module has a “Power” led, which indicates that it is on, and three “Tx“, “Rx“
and “BT“ communication leds to indicate data reception/transmission and Bluetooth
connection activated.
Further details about how to make a correct Bluetooth connection are available in the
ABB Ekip Connect SW operation manual (1SDH000891R0002)

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2.12. Putting into service and recommendations
2.12.1. Installation
Circuit-breakers purchased with the relay unit assembled do not require this operation which is, however, necessary in the case
of replacement.
To complete the procedure for installing a PR122/P or PR123/P unit, follow the steps below:
1. With the circuit-breaker open and preferably isolated, install the protection unit on the circuit-breaker
2. Power the unit ONLY from the PR030/B
3. If there are no other errors, the display will show the message Configuration (configuration error) accompanied by the yellow
LED coming on permanently (warning)
4. Enter the unit’s “Settings” menu
5. Select “Circuit-breaker”
6. Select “Unit installation”
7. Input the password
8. Select “Install” and press “ENTER”
9. When the red led flashes on and off and the message Installation (installation error) is displayed, remove the PR030/B
10. Power the relay from any other source.
11. Check for the absence of configuration errors.
2.12.2. Uninstalling
To complete the procedure for uninstalling a PR122/P or PR123/P unit, follow the steps below:
1. With the circuit-breaker open and/or isolated power the unit from the PR030/B
2. Enter the unit’s “Settings” menu
3. Select “Circuit-breaker”
4. Select “Unit installation”
5. Input the password
6. Select “Uninstall” and press “ENTER”
7. Remove the PR030/B
8. Remove the PR123/P unit from the circuit-breaker
9. The remove the TC connector, proceed as indicated in the figure alongside.
The uninstalling procedure is not strictly necessary for operation but is strongly recommended as
it allows allows circuit-breaker parameters such as contact wear and others that would otherwise
be lost, to be stored. The data in question are then transmitted to the new PR123/P unit installed on the same circuit-breaker.
2.12.3. Connections
WARNING: For the connections provided by the user, it is recommended that you comply strictly with the rec-
ommendations contained in this document. This will enable us to satisfy all the international reference standards
and guarantee perfect operation of the relay even under severe environmental and electromagnetic conditions.
Pay particular attention to the types of cable, the connections to earth and the maximum distances.
2.12.4. CS and TC connection test
WARNING: If the PR122/P was installed by the user, it is important, before closing the CB, to check the last line
on the display when the relay is turned on for the first time via a PR030/B battery unit. No CS and/or TC discon-
nected messages must appear; if they do, do not close the circuit-breaker and make the correct connections.
2.12.5. Current sensor connection for external neutral
WARNING: If you want to connect the current sensor for the external neutral conductor to a three-pole circuit-
breaker, remember to set InN. accordingly. During this procedure, the circuit-breaker must be open and prefer-
ably isolated.
2.12.6. TV connections
All the application and functional details for correct use of the TV are described in par. 2.11.1.3.
2.12.7. How to put the Rc sensor into service
If relays PR122/P and PR123/P are to be provided with the Rc function, comply with the indications below to update the unit:
1. Disconnect all power supplies;
2. Comply with the instructions in document 1SDH000616R0001: install the supplied rating plug and XK2 cable for the RC ap-
plication.
3. Install the toroid on the busbars as shown in the 1SDH000601R0001 document;
4. Connect the toroid to the relay as shown in the wiring diagram.
5. Power the unit through PR030/B and proceed to installation according to the following path: settings, CB, earth protection,
external toroid, RC. Confirm the changes;
6. Check that no failures are indicated;
7. Set threshold and times of Rc protection;
8. Conduct an Rc test (see par. 2.10 Menù Test); check for correct operation.

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2.13. Default settings
Before the PR122/P and PR123/P are put into service, it is essential for the user to define and carefully adjust the editable pa-
rameters to suit his installation requirements.
ABB SACE will apply the adhesive rating plates of all the variables concerning the CB (e.g. Type of CB, Rating Plug size, etc.),
thereby allowing the user to find the information he needs when defining the parameters.
When the PR120/V module is installed, the user must adjust the installation voltage properly.
WARNING: Apart from this, it is absolutely essential for the user to change the password and carefully define
each editable parameter before putting the relay into service.
The PR122/P and PR123/P is supplied by ABB SACE with the following predefined parameters
Protection On/Off Thresholds Time Curve T.M. ZS Trip
L -- 1 In 144 s I2
t Off -- --
S Off 6 In 50 ms K -- Off: 0,04 s --
S2 (only for PR123/P) Off 6 In 50 ms K -- Off: 0,04 s --
D (only for PR123/P) Off 6 In 0,2 s - 0,2 s Off: 0,13 s --
I On 4 In -- -- -- -- --
G Off 0,2 In 0,4 s K -- Off: 0,04 s On
U (currents) Off 50 % 5 s Off
OT -- Off
K LC1 Off 50 % I1
K LC2 Off 75 % I1
UV Off 0.9 Un 5 s Off
OV Off 1,05 Un 5 s Off
RV Off 0,15 Un 15 s Off
RP Off - 0,1 Pn 10 s Off
UF Off 0,9 Fn 3 s Off
OF Off 1,1 Fn 3 s Off
Language -- Engl
Net Frequency -- 50 Hz
Local Bus unit Off
Neutral sel. -- *
Toroid Selec. -- None
Ext. ground tor. Off 100 A
Rated Voltage -- 380V
S startup Off 6 In 100 ms
I startup Off 4 In 100 ms
G startup Off 1 In 100 ms
Password -- 0001
Measuring interval -- 60 min
Iw Off 3 In
Power direction -- top  bottom
Warning: harmonic distortion Off
MCR Off 6 In 40 ms -- -- -- --
Start up activation threshold 0,1In
Note:
* = OFF for three-pole versions
* = 50% for four-pole versions
* = 100% for full size versions

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1SDH000460R0102
2.14. Troubleshooting
2.14.1. Troubleshooting
The following table lists a series of typical service conditions, to help you understand and solve hypothetical faults or malfunctions.
Note:
1. Before consulting the following table, check for any error messages appearing for some seconds on the display.
2. FN indicates the normal operation of the PR123/P.
3. In the case where the suggestions proposed do not lead to a solution of the problem, please contact the ABB SACE assistance
service.
4. If possible, use the external communication units and supply a report downloaded by means of Ekip Connect.
N° Situation Possible causes Suggestions
1 The trip test cannot be run 1. The busbar current is > 0
2. The TC is not connected
1. FN
2. Check the messages on the display
2 Trip times lower than ex-
pected
1. Threshold too low
2. Curve too low
3. Thermal memory enabled
4. Incorrect Neutral Selection
5. The SdZ is inserted
1. Correct threshold
2. Correct curve
3. Exclude if not necessary
4. Correct Neutral Selection
3 Trip times higher than
expected
1. Threshold too high
2. Curve too high
3. Curve I2
t inserted
4. Incorrect Neutral Selection
1. Correct threshold
2. Correct curve
4. Correct Neutral Selection
4 Rapid trip, with I3=Off Iinst tripped FN with short-circuit with high I
5 High earth I, but no trip
happens
1. Incorrect selection of the sensor
2. Function G prevented with I>4In
1. Set int. or ext. sensor
2. FN
6 Display off 1. Vaux missing and the current and/or
voltage are below the minimum value.
2. Temperature off range
1. FN, see par. 2.3.5.2
2. FN, see par. 2.3.4 and see par. 2.6.17
7 The display is not back-lit Current and/or voltages below the limit for
lighting the display
FN
8 Reading of I incorrect Current below the minimum threshold that
can be displayed
FN
9 Reading of V, W and power
factor incorrect
1. Connection error between VT and
PR120/V
2. Voltage parameter setting error
1. Check connections between VT and PR120/V
2. Set correct parameters
10 “ Local Bus” message
on display
No communication between PR123/P and
Flex Interface
1. If not present, disable PR021/K, see par. 2.9.3
2. Check bus connection
3. Check Flex Interface
11 Message “” instead of
expected data
Function disabled or data off range FN
12 The expected trip does not
occur
Trip function disabled FN enable trip if necessary
13 No activation of the Unbal-
ance U protection
Values of I out of range FN, see par. 2.6.11
14 No display of the opening
data
Vaux missing,the buffer capacitor is dis-
charged
FN, see par. 2.7.2
15 The password is not re-
quested
The password has been disabled FN, re-enter the password with a value other
than 0000
16 Impossible to change any
parameter
PR123/P in alarm situation FN
17 “ Temp. sensor” or
“ Start-up” message
Possible failure inside relay Contact ABB Sace
18 Invalid date 1. First installation
2. Information lost due to power failure
Change date, see par. 2.9.8
19 Untimely trip See par. 2.4.3.2
20 LED lighting See par. 2.4.1
21 The language cannot be
changed
1. Relay remotely set
2. CB not open
3. Vaux or PR120/V or PR030/B not in-
stalled
1. Set locally
2. Open CB
3. Power the relay

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2.14.2. In the case of a fault
WARNING: If you suspect that the PR123/P is faulty, if has a malfunction or has generated an unwanted trip, it
is advisable to follow the recommendations below very carefully from the
Measurements menu Historicals Trip:
1. Make a note of the type of protection that has tripped by accessing the LAST TRIP page if there is an external power supply
(Vaux or battery) or by pressing “i Test” if in self-powering mode.
2. Note down the type of circuit-breaker, number of poles, any accessories connected, In, Serial Number (see par. 14.4) and the
SW version.
3. Prepare a brief description of the opening (what LEDs and/or indications were displayed? when did it happen?, how many
times ?, was it always under the same conditions? what type of load? what voltage? what current? is the event reproducible?)
4. Send/communicate all the information collected, together with the circuit diagram for the circuit-breaker, to your nearest ABB
Customer Support service.
The completeness and accuracy of the information given to the ABB Assistance service will facilitate technical analysis of the
problem encountered, and will allow us to carry out all actions useful for the user rapidly.
WARNING: Letting a switch run with a fault that has not been remedied may lead to an apparatus malfunction
or shutdown. Remove the apparatus immediately until it can be inspected or repaired if this situation may lead
to personal injury, damage or is otherwise critical.
2.15. External units
Relays PR122/P and PR123/P can be connected to external units for temporary functions or to expand the functions and facilitate
use:
- PR030/B
- BT030-USB
- PR010/T
- Ekip T&P
- HMI030
- Flex Interface
The Ekip Connect communication SW is also available. It is supplied with BT030-USB and Ekip T&P modules and can also be
used with PR120/D-M.
Full details about the performance and use of the units listed above are given in Operation Manual 1SDH000460R0002.

1SDH000460R0102
L6555
ABB S.p.A.
ABB SACE Division
Via Baioni, 35 - 24123 Bergamo - Italy
Tel.: +39 035.395.111 - Telefax: +39 035.395.306-433
http://www.abb.com
Due to possible developments of standards as well as
of materials, the characteristics and dimensions speci-
fied in the present catalogue may only be considered
binding after confirmation by ABB SACE.

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