ZW43-12 outdoors exchange vacuum circuit-breaker rated voltage 12kV, three phase AC 50Hz outdoors high-voltage switch equipment. Mainly uses in to break, the pass gathers the electrical power system the load current, the excess current and the short-circuit current. Is suitable to the transformer substation, the industry and mining enterprise and the city, the agricultural network makes the protection and the control, specially uses in to operate the frequent place and the city net automation power distribution network.