Square D™ QO™ Main Breaker Load Center, 1-Phase Convertible Neutral, 120/240 VAC, 200 A, 1 Pole, 50/60 Hz, 22 kA Interrupt, 42 Circuits, QO Breaker, Panel Breaker Mounting, 3-Wire Wiring Configuration, 42 Spaces, 4 AWG to 250 kcmil Aluminum/Copper Wire, Plug-On Mount, NEMA 1, 11 Enclosure Box, Sheet Steel Housing, 14.25 in W x 3.75 in D x 37.98 in H