Square D™ I-Line™ Panelboard Interior, Main Lug, Series: NQ Series, 225 A, 240 VAC, 3 Phase, 4-Wire, 42 Spaces, QOB/QOB-VH/QHB Circuit Breaker, Copper Bus, 38 in H x 20 in W x 6-1/2 in D
Square D NQ main lug interiors accept plug-on and bolt-on circuit breakers.