Used on type aqb,100 amp,3 pole. 10.000" overall length 5.000" overall width 2major components:arc chute assy 1; base 1; cover 1; usage design:used as frame for circuit breaker; mtg configuration:mounts by four 1/4-20 screws, spaced 1-5/8 in.by 8-3/4 in.c to c; reference number differentiating characteristics:less trip unit;