ppt of EEE(MCB)
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MCB stands for Miniature Circuit Breaker. It is a manually or automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. It detects fault conditions and interrupts current flow, unlike a fuse which must be replaced after operating. MCBs protect individual appliances up to large high voltage circuits for cities. They automatically switch off circuits during abnormal network conditions like overloads or faults. MCBs are more sensitive to overcurrent than fuses but can be reset to resume operation, while an advantage of fuses is they are less costly than MCB systems.
ppt of EEE(MCB)
- 2. What is MCB? MCB(Miniature Circuit Breakers) A MCB is a mechanical switching device which is capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified time and automatically breaking currents under specified abnormal circuit conditions such as those of short circuit.
- 3. In short, MCB is a device for overload and short circuit protection. It is a manually or automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and interrupt current flow.
- 4. Who described it? An early form of circuit breaker was described by Thomas Edison in an 1879 patent application, although his commercial power distribution system used fuses.
- 5. What is it’s purpose? Its purpose is to protect lighting circuit wiring from accidental short-circuits and overloads.
- 6. What is it’s function? Its basic function is to detect a fault condition and interrupt current flow. Unlike a fuse, which operates once and then must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.
- 7. Advantages of MCB It automatically switches off the electrical circuit during abnormal condition of the network means in over load condition as well as faulty condition. The fuse does not sense but Miniature Circuit Breaker does it in more reliable way. MCB is much more sensitive to over current than fuse.
- 8. Disadvantages of MCB Only one disadvantage of MCB over fuse is that this system is more costlier than fuse unit system.
- 10. Characteristics of MCB Rated current not more than 100 A. Trip characteristics normally not adjustable. Thermal or thermal- magnetic operation.
- 12. Thank you.