wound motor speed control device achieve the purpose of regulating motor ... the motor rated current.2.No impact on smooth start to extend the life of mechanical equipment ... and installation and maintenance are convenient.II, Application:Applicable to three-phase AC 380V 660V, 3KV, 6KV,10KV ... asynchronous motor soft starter and control surging currentIII, How to order,1, Model of motors, rated power, ...