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, Duplex Standard UL Listed Voltage Rating 120 Amperage Rating (1) 1-Pole 15 AMP, (1) 1-Pole 20 AMP Interrupt Rating 10 Number Of Poles 2