Industrial and residential Square D circuit breaker enclosures designed to be tough, reliable and provide exceptional performance in the most grueling conditions. The enclosure is suitable for service entrance equipment with neutral assembly AL800SN installed. Provides a dead front housing for Power Pact P circuit breakers, molded case switches, and motor circuit protectors to prevent personnel from accidentally contacting energized parts. Encloser acceptes 80 % rated 2 or 3 poles 250A to 1200A circuit breakers. The short circuit current rating of the enclosed circuit breakers is equal to the rating of the circuit breaker installed unless otherwise noted. This NEMA 12/3R without knockouts enclosure has dimensions as Height of 53 inch, Width of 20-3/4 inch and Depth of 9-1/2 inch. Provides NEC 100 compliant sealable equipment. Meet the lock out/tag out requirements of OSHA 29 CFR 1910.147 subpart S. Designed to meet or exceed UL 50 requirements for specific environmental conditions. Complies with NEC 240.30. cULus listed. Protect breaker from physical damage. Allow breaker operation without removing cover