ZW10(27)-12 outdoor high voltage AC vacuum circuit breaker is a three-phase outdoor high voltage AC switchgear, mainly used in power distribution systems of rural power grids, urban power grids, mines, railways and ports with a voltage level of 12kV and a rated frequency of 50Hz. It is particularly suitable for outdoor overhead lines to separate and connect load current, overload current and short-circuit current, and to switch and protect the power grid.