WHK is a new generation single-coil operation of the PC-class switches, and conventional motor-driven way to convert the switch, compared with a simple structure, transform the action fast (time <80ms) and so on. And the main contact system for single-pole double-throw (V-type) structure, even in exceptional circumstances will not result in the same time connected to two power supplies. 
 This product is rated insulation voltage 690V, rated frequency 50,60 Hz, rated current of 32A ~ 6300A. Emergency power supply system for switching between dual power to ensure that critical loads (such as fire load) continuous reliable operation. Mainly for the state of a load for high-rise buildings, post fire, coal ship, chemical metallurgy, pipeline work, health, military facilities and other requirements to provide uninterrupted power supply normal place.