Siemens Low Voltage Residential Circuit Breakers Main Breakers - Branch Main Breakers Non-reversible are Circuit Protection Load Center Mains, Feeders, and Miniature Circuit Breakers. Type: QN Application: Electrical Distribution Standard: UL 489 Voltage Rating: 120/240V Amperage Rating: 200A Trip Range: Thermal Magnetic Interrupt Rating: 10 AIC Number Of Poles: 2P