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 in per pole. UL listed, HACR rated. 15 to 25 A 14 to 8 Cu or 12 to 8 Al AWG wire, 30 to 50 A 8 to 4 Cu or 8 to 2 Al AWG wire. 3-9/32 in H x 1/2 in W x 2-3/8 in D. 120/240 V, 10,000 AIR.