AC363R, 100 amp, 600 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 AC363R, AC363RJ, AC1363, AC1363R, AC1363RJ