Siemens Low Voltage Residential Circuit Breakers Miniature Thermal Mag Circuit Breakers - Duplex, Triplex, Quadplex are Circuit Protection Load Center Mains, Feeders, and Miniature Circuit Breakers. Type MH-T, Triplex Features 1/2 IN W-per-pole construction , Center common trip Wire Size 8-6 AWG CU, 8-4 AWG AL Std UL Listed, CSA Certified, SWD, HACR Rated V. Rating 120/240 A. Rating (2) 1-Pole 20AMP, (1) 2-Pole 40 AMP Interrupt Rating 10 Number Of Poles 3 L 3/1/2008 W 2 H 3Operating Temperature 40