KGHD series hydraulic electromagnetic circuit breaker is applicable for making and breaking operation for circuit of equipment in AC 50Hz or 60Hz electrical system with the rated voltage 250Vand the rated current of 1A~100A,and it is also applicable for protecting overload and short circuit of circuit and motor. The circuit breaker is widely used for computer and its peripheral equipment, industrial automatic device, telecommunication equipment, telecommunication power supply and UPS uninterrupted power supply equipment, as well as railway vehicle, electrical control system for ship, elevator control system and moveable power supply equipmentetc, Especially it is applicable for locations with impact or vibration. It conforms to GB 17701-1999, IEC60934:1993 and C22.2 standards.