Littelfuse BLS-3 BLS003, 3 Amp 600V Cartridge Fuse Dimensions: 34.925 mm L x 10.31 mm D 3 Amp (3A) 600V Fast Acting Midget Fuse This Littlelfuse BLS-3 or BLS003 could be used to substitute for Bussmann BBS-3 and Ferraz Shamwut/Mersen SBS3