... controlling technique,power and electron technique, and multiple SCR series/parallel to motor, to protect the ... like short circuit, over current,current limiting, over-voltage, under-voltage,over load, open-phase, 3 phase unbalance, ... also easy to install suitable motorAC squirrel cage motorRated voltage<=10KVRated current75A ~ 600ARated power500KW ~11000KW cabinet sizemm2300X1300X1560working condition ...