Fuse, 40 A, 250V AC, 125V DC, Class RK5, ECNR Series, Nonindicating, Time Delay, Body Style Cylindrical, Fits Fuse Block Style Rejection, Interrupt Rating 200kA at 250V AC, 20kA at 125V DC, Fuse Size 3 in L x 13/16 in dia, Length 3 in, Diameter 13/16 in, Equivalent Brand and Series Bussmann FRN-R, Edison ECNR, Littelfuse FLNR, Mersen TR-R, Equivalent Series ECNR, FLNR, FRN-R, TR-R, Compatible Fuse Block Series R250, Body Material Fiberglass, Dual Element.