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: 15-30A Trip Range: Thermal Magnetic Interrupt Rating: 10 AIC Number Of Poles: 2P.