Square D™ I-Line™ Panelboard Interior, 3-Phase Bottom, Series: NF Series, 480Y/277 VAC, 600Y/347 VAC, 250 A, 42 Spaces, Short Circuit Current Rating: 100 kA, EDB/LAL/LHL Breaker, 4-Wire Wiring Configuration, Copper Bus, Panel Mount, NEMA 1/3R/5/12, Copper Housing, 20 in W x 5-3/4 in D x 39 in H