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. This load center interior has a high amperage fixed main with factory installed main lugs that are rated for 400 A. This interior has 42 spaces and has a 65 kA breaking capacity. The main lugs will accept 1/0 AWG to 750 kcmil copper or aluminum wire. This interior is UL component recognized and cUL certified. It is encased in a NQ enclosure.