SIEMENS LOW VOLTAGE SN SERIES LOAD CENTER. FACTORY INSTALLED MAIN BREAKER WITH 20 1-INCH SPACES ALLOWING MAX 20 CIRCUITS. 1-PHASE 3-WIRE SYSTEM RATED 120/240V (100A) 22KA INTERRUPT. SPECIAL FEATURES: ALUMINUM BUS VALUE PACK, GRAY TRIM, NEMA TYPE1 ENCLOSURE FOR INDOOR USE.