Littelfuse KLKD20 KLKD020, 20Amp (20A) 600V Fast Blow Midget Cartridge Fuse NEW Dimension: 2/5" D x 1-1/2" L Cartridge 20Amp (20A) 600V Fast Blow Midget Fuse This Littelfuse KLKD 20 or KLKD020 could be used to substitute for Bussmman KLM-20 and Ferraz/Shamwut/Mersen ATM20