QO Load Centers offer premium features by allowing QO breakers, ground arc fault interrupters arc fault interrupters and surge arresters to be installed inside QO Load Centers enable the use of a full complement of accessories. Systems can be single or three phase and have indoor and outdoor versions. QO Load Centers feature plated copper bus, providing superior performance and durability. This QO Load Center accessory is a subfeed lug kit rated for 125 A, 3 pole, and 3 spaces.