Main breaker with aluminum bus. Rated 22,000A IR. Indoor enclosure type 1. Complete assembly. Trim fits both surface and flush mounting applications. One-piece bus bar construction. Split neutral. UL listed as suitable for use as service entrance equipment. UL listed for 60°/75° C. conductors. Standard factory installed 22kA IR main circuit breaker. 1 phase, 3 wire solid neutral. 120/240 volts AC. 100 Amp main breaker load center with 20-spaces/20-circuits. Max. 2 pole spaces 10. Less breakers.