BMX-63L series small leakage circuit breaker is a new product of MINGRI which has novel appearance, high breaking capacity and advanced structure, and is suitable for power supply lines with 50Hz ac, rated working voltage up to 400V and rated current up to 63A.Protect lines and electrical equipment from overload and short circuits.Leakage circuit breakers shall be used for leakage protection.Its current action type is electronic.It is mainly composed of zero sequence current transformer, electronic component board and circuit breaker.