Q Line Circuit Breakers Are One-Inch Wide Per Pole, Compact, Thermal-Magnetic Devices Designed For Residential and Commercial Applications. The QB Breakers Are Bolt-On Versions Of The Q Line Used For Bolting to The Bus Connections Of Load Centers and Lighting Panels. All Q Line Circuit Breakers Feature Quick-Make / Quick-Break Mechanisms, Common Trip Bars, and Easy to Spot Trip Indication to Ensure Safety and Reliability. Q Line Breakers Are Available In 1, 2, and 3 Pole Versions, Can Be Ordered With Auxil