Square D™ QO® Main Breaker Load Center, 3-Phase Convertible, 208Y/120 VAC/240/120 Delta VAC/240 Delta VAC, 150 A, 1 Pole, 50/60 Hz Frequency, 25 kA Interrupt, 42 Circuits, Panel Breaker Mounting, 4-Wire Wiring Configuration, 42 Spaces, 4 AWG to 300 kcmil Wire, Bolt-On Mounting, NEMA 1 Enclosure, NEMA 12 Enclosure Box, Steel Housing Material, 14.25 in W x 3.75 in D x 39.37 in H Dimensions