PS20AC1IL. 20a 120/277Vac b+s wire sp key lock I . External screw pressure plate back and side wired. Accepts #14 #10 AWG copper or copper clad conductors. . Heavy Gauge one piece copper alloy contact arm virtually eliminates contact bounce. . Cam controls fast make and positive break to minimize arcing. . Heavy duty bumper pads for quiet operation. . High strength thermoplastic polycarbonate toggle. .