An MCB is a Miniature Circuit Breaker designedto protect an electric circuit from overload or short circuit. MCBs have all but replaced fuse wires as a safety measure to protect an electric circuit from over-current because they are safer and come with the advantage that they are reusable.
An MCB is an automatically operated electrical switch. Miniature circuit breakers are intendedto prevent damage to an electrical circuit as a result of excess current. They are designed to trip during an overload or short circuit to protect against electrical faults and equipment failure.