Surge Arrester, Station Class, AS, Metal Oxide Disk, 21kVrms, 40k-60kArms, 17(L-N) kVmrs, 17kJ/kV MCOV, High Votlage, 977 ft-lbs Cantilever Strength, Polymer, Gray, Indoor/Cubicle Terminal Mounting, Tranquell (9L11XPB) Series