Siemens Low Voltage Residential Circuit Breakers Miniature Thermal Mag Circuit Breakers - Surge are Circuit Protection Load Center Mains, Feeders, and Miniature Circuit Breakers. Type: QSA Application: Electrical Distribution Standard: UL 489 Voltage Rating: 120V Amperage Rating: 20-20A Trip Range: Thermal Magnetic Interrupt Rating: 10 AIC Number Of Poles: 1P Connection: PLUG-IN Length: 4.5 Width: 3.3 Height: 2.2