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 20-50A Trip Range Thermal Magnetic Interrupt Rating 10 AIC Number Of Poles Two single poles and one double pole