An MCB is a manually operated electrical switch. Miniature circuit breakers are intended to 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. It is a crucial component of electrical distribution systems and is used to protect various electrical appliances and equipment from damage due to excessive current flow. MCB’s are used primarily as an alternative to the fuse switch in most of the circuits.