Industrial and residential Square D circuit breaker enclosures designed to be tough, reliable and provide exceptional performance in the most grueling conditions. The short circuit current rating of the enclosed circuit breakers is equal to the rating of the circuit breaker installed unless otherwise noted. The enclosure is not compatible with earth-leakage or ground-fault modules, H, J-frame circuit breakers with MicroLogic trip units can be used with these enclosure without communication accessories and trip unit is not accessible or visible Encloser acceptes 80 % and 100% (up to 400A) rated 3 poles 250A to 600A circuit breakers. This NEMA12/3R s enclosure without knockouts has dimensions as Height of 57.5 inch, Width of 20.38 inch and Depth of 8.25 inch.