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. Systems are single phase and are rated for indoor use or are rain proof. Homeline load centers are designed for residential and industrial use to protect electrical systems, equipment and people. This is a plug on neutral surge protective device for Homeline load centers. Designed for 3 wire 12/24 VAC single phase systems. Surgebreaker has a NEMA 2 indoor rating. This surge protection device is rated at 5 kA per phase. This surge protection device has a height of 3.98 inches, a width of 1.97 inches and depth of 2.6 inches. This surge protection device is CSA certified