QO Load Centers offer premium features like QO breakers, ground arc fault interrupters and surge arresters. They are designed to meet residential, commercial, and industrial requirements to protect electrical systems, equipment, and people. Systems are single phase and are rated for indoor use or are rain proof. QO Load Centers enable the use of a full complement of accessories. This is an interlock kit for generator breaker in QO load center. This unit comes in clam packaging.