Miniature Circuit Breaker or MCB

A miniature circuit breaker or MCB is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected. The disadvantage of all fuses is that when they have operated they must be replaced. A MCB overcomes this problem since it is an automatic switch which opens in the event of an excessive current flowing in the circuit and can be closed when the circuit returns to normal.

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