LW28 Series Universal switch mainly for the exchange of 50Hz, rated voltage of 440V and below. Sunshine following DC voltage, rated current of the electrical circuits to 63A,not connected or breaking frequently for manual control and conversion circuits for use, and also the direct control of three-phase asynchronous motor circuit as a master control and measurement purposes. Products are extensively used, instead of switching between different formal conversion, as the official switch control circuits, switching test equipment .motor control switches, and master control switches, and other switch welding machine.