Copper-to-copper connections, calibrated for optimum trip performance, heat resistant thermoset cases and covers, cemented calibration screw. Type THQL - 1" per pole. May be used, when marked to accept, with American Switch, Arrow Hart, Bryant, General Switch, GTE, Sylvania, most ITE, Murray, Westinghouse Type BR, Challenger and Crouse-Hinds. 15 to 30 amp 14 - 8 Cu or 12 - 8 Al AWG wire, 35 to 60 amp 8 - 3 Cu or 8 - 2 Al AWG wire. UL Listed, HACR rated. 1" module, 120/240 volt; 10,000 AIR.