Type ZW 32-12 outdoor vacuum circuit breaker (hereinafter referred to as circuit breaker) is an outdoor power distribution equipment with a rated voltage of 12kV and a three-phase AC capacity of 50Hz. It is mainly used for the load current, overload current and short circuit current in the open and closed power system. It is suitable for the protection and control in the distribution system of substations and industrial and mining enterprises, and for the frequent operation of the rural power grid. The circuit breaker has the characteristics of small size, light weight, anti-condensation and maintenance free, and can adapt to the harsh climate conditions and dirty environment.