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 120V Amperage Rating 30-30A Trip Range Thermal Magnetic Interrupt Rating 10 AIC Number Of Poles 1P