Square D™ QO™ Main Breaker Loadcenter, 1-Phase Neutral, 120/240 VAC, 200 A, 22 kA Interrupt, 54 Circuits, Plug-On Breaker Mounting, 3-Wire Wiring Configuration, 54 Spaces, 4 AWG to 250 kcmil Wire, Plug-In Mount, NEMA 1, Sheet Steel Housing, 39.37 in H x 14.25 in W x 3.75 in D