Its headline rating of 77 A at 480 V (AC-3 duty) means it can handle a motor drawing that current under starting and running conditions — the AC-3 category covers squirrel-cage motors with starting currents up to 6x rated, so this contactor is sized for a typical 40–50 hp motor at 480 V three-phase. Dimensions of 152 mm depth, 70 mm width, and 140 mm height give a compact footprint for the S3 frame size.
Integration notes
Wire termination accepts solid conductors from 2.5 to 16 mm² and stranded from 6 to 70 mm² for the main circuit, with auxiliary contacts handling 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). Minimum clearance of 10 mm upwards, downwards, and sideways, with 20 mm forwards, keeps heat dissipation and arcing space within limits.