ZW8-12 series of outdoor column vacuum circuit breaker is rated voltage 12KV, three-phase AC 50HZ of high voltage outdoor switchgear, primarily for opening and closing the rural network load electricity short, personal area network and small power system, overload current, short-circuit current . The overall structure of the three-phase common tank type, three-phase vacuum interrupter in a metal box, use SMC insulation and white insulation, the insulation performance, reliable, high dielectric strength. ZW8A-12 is a combination of ZW8-12 circuit breaker and isolating the knife made contact, called the combination of circuit breakers. This series of actuator for the CT23 type spring energy storage actuator, divided into electric and manual.