ZW20-12 outdoor AC high-voltage vacuum circuit breaker is an outdoor power distribution equipment with a rated voltage of 12kV and three-phase AC 50Hz. It is mainly used for breaking and closing load current, overload current and short-circuit current in the power system. It is suitable for protection and control in the power distribution system of substations and industrial and mining enterprises, and is more suitable for rural power grids and places with frequent operations.

The circuit breaker consists of a main box with a high-voltage system and its operating components, an operating mechanism box, and a hanger for installation, fixing, and moving (hanging). The circuit breaker equipped with a vacuum arc chamber has stable and reliable breaking performance. It is cast as a whole with epoxy resin and silicone rubber, especially the corner bushings of phases A and C, which ensure good external insulation. It has the characteristics of no combustion and explosion hazards, safety, small size, light weight and long service life. The circuit breaker adopts a fully enclosed structure, and the box is filled with SF6 gas, with good sealing performance, moisture-proof and anti-condensation performance, and is suitable for use in high temperature and humid areas.