This is a Cutler Hammer enclosure. Cat.# SNDN1200 1200 amp to 800 amps 600 VAC max 3 phase 4 wire system A solid neutral is included in this sale. Use MA, HMA, MC, HMC, HND, NB, HNB, NC, HNC, ND, MCG, NCG, HNCG, MD, MDL, MDS, MDY, MDSY type breakers. 64" x 21" x 16" Electrical Surplus Salvage, for your electrical needs. Check out my other items!