Littelfuse KLK-R-25 KLKR025, 25Amp 600V Cartridge Fuse Dimension: 0.406"" Dia x 1.500"" L (10.30mm x 38.00mm) Cylindrical Midget FAST ACTING 25A 600V This Littlelfuse KLK-R-25 could be used to substitute for Bussmann KTK-R-25 (KTKR25) and Ferraz Shamwut/Mersen ATM-R-25 (ATMR25)