Copper-to-copper connections, calibrated for optimum trip performance, heat resistant thermoset cases and covers, cemented calibration screw 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, 70 to 100 amp 6-1/0 Cu or 4 - 1/0 Al AWG wire UL Listed, HACR rated 120/240 volt; 10,000 AIR 1 per pole (2 total). 10.5 Ounce Cartridge Color=Gray