3AF(ZN12-12) series fixed vacuum circuit breaker is rated voltage 12kV, three-phase AC 50Hz indoor high voltage switchgear is the introduction of Siemens technology manufacture.

The circuit breaker operating mechanism for the spring energy storage, which can be AC or DC operation, can also be used manually.

Simple structure of the circuit breaker, breaking capacity, long life operation functional and explosion hazards, maintenance is simple and applies to power plants, substations and other transmission and distribution system of control or protection switching, especially for important load breaking and frequent operation place.