Load Center, Number of Spaces 54, Amps 225 A, Voltage 120/240V AC, Circuit Breaker Type QO, Included Enclosure Cover Combination Flush/Surface Cover, Main Circuit Breaker or Main Lug Main Lug, Max. No. of Tandem Breakers 18, Phase 1, Height 39.38 in, Width 14.25 in, For Use With Square D QO Circuit Breakers, Bus Material Tin Plated Copper, Short Circuit Current Rating 65 kA, Enclosure NEMA Rating 1, Recommended Flush Cover Included, Recommended Ground Bar Kit Included