Field installable main breaker for 100 - 125 amp convertible loadcenters only. For use ahead of QO, QOT, and QO - PL 10,000 AIR branch breakers to permit their application on systems with up to 22,000 amps available fault current. #4 - 2/0 AWG lug wire.22,000 AIR. U.L. Listed. This 100 Amp Main Circuit Breaker is one of many top quality items in our 100 Amp Double department.
