Siemens Low Voltage Residential Circuit Breakers Main Breakers - Type Qs Breakers Are Circuit Protection Load Center Mains, Feeders, And Miniature Circuit Breakers. Type: Qsh Application: Electrical Distribution Standard: Ul 489 Voltage Rating: 120/240V Amperage Rating: 100A Trip Range: Thermal Magnetic Interrupt Rating: 22 Aic Number Of Poles: 2P