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. Indoor enclosures are designed to rotate 18 degrees to accommodate top or bottom service entrance feed which saves expensive service cable. This Surgebreaker is a secondary surge arrestor for QO load centers. It is designed to protect electrical service and major household appliances, excluding electronic devices. Designed for 3 wire 12/24 VAC single phase systems. Surgebreaker has a NEMA 1 indoor rating. This secondary surge protector is rated at 5 kA and has a SCCR of 22.5 kA. It has a plug on design and requires two pole positions. The LED indicator indicates operational status. The QO Surgebreaker is CSA certified ans UL listed