KS21 motor reversing module is a special solid state relay which is only used for reversing control and bucking-connected brake control by three phase motor.It integrates logic interlock circuit and turn-on delay circuit, to avoid destruction from phase-to-phase short circuit caused by input controlling misoperation. As long as the switching time meet the specification, it can protect the power supply system, motor and module itself. In the meantime, the module integrates RC snubber and varistor protection circuit to improve its reliability. The module offer (48~530)VAC output voltage,with ouput current at 25A and 50A. It include a double color LED to indicate the running status conveniently.