QO and QOB one, two and three pole thermal magnetic circuit breakers provide overcurrent protection and switching on ac and dc systems. These circuit breakers have an over center, trip free toggle mechanism with quick make, quick break action and positive handle indication. They also have VisiTrip trip indication, which provides a visual indication that the circuit breaker has tripped and interrupted the circuit. There is a full line of accessories available for these circuit breakers. This mains lugs kit is for field installable in convertible main circuit breaker and main lugs load centers. Kit can be used for load centers rated from 150 to 225 A. The lugs will accept 6 AWG to 300 kcmil copper or aluminum wire. Lug is UL listed and CSA certified.