Copper-to-copper connections, calibrated for optimum trip performance, heat resistant thermoset cases and covers, cemented calibration screw. Nearly identical to Type THQL with the same design and performance, yet only taking up 1/2 the space, 1/2" per pole. UL Listed, HACR rated. 15 and 20 amp SWD, switching duty rated, suitable for 120 volt fluorescent lighting loads. 15 to 25 amp #14 - 8 Cu or #12 - 8 Al AWG wire, 30 to 50 amp #8 - 4 Cu or #8 - 2 Al AWG wire. 3-9/32" height x 1/2" width x 2-3/8" depth. 120/240 volt; 10,000 AIR.