For use in single and 3-phase Type BR loadcenters 150 amp and up. Requires two 1 in pole spaces on left side and two 1 in pole spaces on right side. No.BJHDS hold down kit, necessary for using as a main or back feed device, sold separately. #2 - 300 kcmil wire range. 120/240 volt AC, 10,000 AIC.