"q Line Circuit Breakers Are One-inch Wide Per Pole, Compact, Thermal-magnetic Devices Designed For Residential And Commercial Applications. The Ql Breakers Areplug-in Versions Of The Q Line Used For Connection To Load Centers And Lightingpanels. 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 Orderedwith Auxiliary Contact And Shunt Trip Accessories, And Can Be Ordered For Use Inhid Applications."