Industrial Circuit Breaker Enclosures are designed to be tough, reliable and provide exceptional performance in the most grueling conditions. Provides a dead front housing for circuit breakers, molded case switches, and motor circuit protectors to prevent personnel from accidentally contacting energized parts. Designed to meet or exceed UL 50 requirements for specific environmental conditions. Allow breaker operation without removing cover. These units are UL Listed and CSA Certified. Square D equipment with R or RB suffix, designated NEMA 3R rainproof construction, utilizes bolt-on hubs listed below. RB devices will accept 3/4 in. through 2- 1/2 in. bolt-on hubs without the use of reducers. Off-center conduit thread openings and elongated mounting holes provide quick and easy adjustment to eliminate costly conduit offsets and bends. Load Center Hub, 1.25 in, rainproof, for RB devices is a conduit entry, and is used for conduit installation. This bolt-on accessory has a UL listed rating. The dimensions are 4.88 mm(H)4.88 mm(W)1.88 mm(D). This product comes with an 18 month warranty.