HEAVY DUTY TYPE; 9.32 INCH W X 4.81 INCH D X 17.58 INCH H SIZE; 3 WIRE(S); UL 98, CSA APPROVAL; NEMA 1 ENCLOSURE; 100 AMPERE CURRENT RATING; 75 HP AT 480 VAC 3-PHASE, 100 HP AT 600 VAC 3-PHASE (NEC STANDARD), 20 HP AT 250 VDC POWER RATING; 3 POLE(S)