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).