Square D™ QO® Main Breaker Load Center, 1-Phase Convertible Neutral, 240 VAC, 200 A, 1 Pole, 50/60 Hz, 22 kA Interrupt, 42 Circuits, QOM2 Breaker, Panel Breaker Mounting, 3-Wire Wiring Configuration, 42 Spaces, 4 AWG to 250 kcmil Aluminum/Copper Wire, Plug-On Mount, NEMA 3R, 8R Enclosure Box, Galvannealed Steel Housing, 14.75 in W x 4.52 in D x 37.98 in H