Panelboard Interior, Convertible, Main Lug, Circuit Breaker Series QHB, QOB, QOB-VH, Amps 100 A, Short Circuit Current Rating 100000 RMS Symmetrical, Number of Spaces 18, Voltage 120/240V AC, Phase 1, Bus Material Aluminum, Recommended Enclosure 1D687 for Main Lug, 6B429 for Main Breaker, Circuit Breaker Type Plug In Miniature, For Use With NQ Circuit Breakers, Height 21 in, Depth 5 3/4 in, Width 10 7/16 in, Recommended Flush Cover 3TX77 for Main Lug, 3TX81 for Main Breaker