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: Qt Application: Electrical Distribution Standard: Ul 489 Voltage Rating: 120/240V Amperage Rating: 40-20A Trip Range: Thermal Magnetic Interrupt Rating: 10 Aic Number Of Poles: 2P