AC323R, 100 amp, 240 volt, 3 phase, 3 wire, fusible style bus plug, type BEC / AC, UL Listed assembly, complete with UL Recognized internal switch and components, suitable for use with OEM Armor Clad industrial busway systems, accepts Class H, R and J fuse types, direct substitute, fit and function for OEM AC323R, AC323RJ, AC1323, AC1323R, AC1323RJ