Panelboard Interior Convertible Main Lug Circuit Breaker Series QHB QOB QOB-VH Amps 400 A Short Circuit Current Rating 100000 RMS Symmetrical Number of Spaces 42 Voltage 120/240V AC Phase 1 Bus Material Copper Recommended Enclosure 12N640 for Main Breaker 1D700 for Main Lug Circuit Breaker Type Plug In Miniature For Use With NQ Circuit Breakers Height 45 in Depth 5 3/4 in Width 10 7/16 in Main Circuit Breaker Adapter Kit 4HHA5