Square D™ QO® Generator Main Breaker Load Center, 1-Phase Fixed Grounding Bar, 120/240 VAC, 100/30 A, 50/60 Hz, 10 kA Interrupt, 8 Circuits, Panel Breaker Mounting, 3-Wire Wiring Configuration, Bus Rating: 30 A, 4 Spaces, 8 to 2 AWG Aluminum/Copper Wire, Plug-On Mount, NEMA 3R, 17R Enclosure Box, Galvanized Steel Housing, 8.9 in W x 12.64 in H