Square D™ QO® Main Breaker Load Center, 1-Phase Convertible Neutral, 120/240 VAC, 200 A, 1 Pole, 50/60 Hz Frequency, 22 kA Interrupt, 30 Circuits, QO Breaker, Panel Breaker Mounting, 3-Wire Wiring Configuration, 30 Spaces, 4 AWG to 250 kcmil Aluminum/Copper Wire, Plug-On Mounting, NEMA 3R Enclosure, 6R Enclosure Box, Galvanized Steel Housing Material, 14.75 in W x 4.52 in D x 29.86 in H Dimensions