Square D,STARTER 600VAC 135AMP NEMA +OPTIONS,135 A,3 phases,3-Pole,4,40HP@200VAC - 50HP@230VAC - 100HP@460/575VAC,600 V AC,600VAC@60Hz - 550VAC@50Hz,S,Screw Clamp,UL Listed - CSA Certified,Used for Full-Voltage Starting and Stopping of AC Squirrel Cage Motors,melting alloy 3,not rated (open device),starter