Eaton Bussmann JKS-50, 50Amp 600V Fast Blow Class J Cartridge Fuse Ships same business day. Dimension: 2.35" H x 1.05" W x 1" D Cartridge 50Amp (50A) 600V Fast Blow Class J Fuse This Eaton Bussmann JKS-50 (JKS50) could be used to substitute for Littelfuse JLS050 and Ferraz/Shamwut/Mersen A4J50