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, 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.