miniature circuit breaker, referred to as MCB, is the most widely used terminal protection appliance in building electrical terminal power distribution devices.

A Miniature circuit breaker refers to mechanical switchgear capable of connecting, conducting and interrupting current under normal circuit conditions and of producing, conducting and interrupting current for a specified period of time even under certain abnormal circuit conditions.

miniature circuit breakers can be used for overload and short-circuit protection of lighting, distribution lines and equipment in office buildings, residences and similar buildings, and can also be used for infrequent on-off operations and conversions of lines. It is mainly used in various places such as industrial, commercial, high-rise and residential buildings.

miniature circuit breakers have the characteristics of advanced structure, reliable performance, strong breaking capacity, beautiful and compact appearance, etc. They are mainly used in places with AC 50HZ or 60HZ, rated voltage below 400V, and rated working current below 63A.