KYN28A-12 Ac Metal-enclosed Switchgear Equipment（Abbreviation as Switchgear）,three-phase ac 50 hz, rated voltage of 12 kv single busbar and busbar sectionalizing system complete sets of power distribution equipment.Is suitable for the power plant, substation and airports, docks, factories and mines enterprises, hotels, financial executive and civil construction, such as indoor power supply system, for acceptance, distribution, and monitoring to protect electricity grid.This product is accord with the standard GB3906, DL/T404.By the high voltage electrical machinery industry product quality testing center and the national electronics product quality supervision and inspection center all type tests, and through the internal arc fault test.Has the circuit breaker to prevent wrong operation, prevent loading push-pull cars, prevent electric grounding switch, to prevent the earthing switch when the grounding position power and prevent straying into charged interval (5) prevention function, is a kind of superior performance of the power distribution device.GuiZhu switch mainly adopts the company produced ZN73 (VS1), VHS series indoor high voltage vacuum circuit breaker, has a long service life, high breaking capacity, frequent operation, safe and reliable running etc.