Our ZW27-12 outdoor high voltage vacuum circuit breaker is a distribution device, working with air insulation, vacuum arc suppression but without any oil. The utilization of mature experience of Toshiba VSP5 automatic sectionalizer enables the product to present superior performance over other similar products at home. Suitable for the 50Hz, 12Kv and below power system, this equipment is commonly used to interrupt and make the load current, overload current and short-circuit current.