Siemens Low Voltage Residential Circuit Breakers Main Breakers - Load Center Main Breakers are Circuit Protection Load Center Mains, Feeders, and Miniature Circuit Breakers. Type: QPJ Application: Electrical Distribution Standard: UL 489 Voltage Rating: 240V Amperage Rating: 150A Trip Range: Thermal Magnetic Interrupt Rating: 10 AIC Number Of Poles: 3P