Littelfuse 0JTD04.5T POWR-GARD Time Delay Fuse. Littelfuse POWR-GARD Time Delay Fuse, Current Limiting, Series: JTD, Non-Indicating, 4.5 A, 600 VAC/300 VDC, 200/20 kA Interrupt, Class: J, Ferrule Terminal, Holder Mounting, Cartridge Body, Dual Element, Melamine, 13/16 in Dia x 2-1/4 in L Body. Additional Description: LTFS-JTD04.5 0JTD04.5T UL CLASS J TIME-DELAY FUSES 4-1/2 AMP SIZE. Catalog Description: The Littelfuse® POWR-PRO® JTD_ID Indicator Class J fuse provides visual blown fuse indication and maximum protection in a compact package. The compact Class J package was designed specifically for circuits where space is at a premium. The current limiting time delay JTD_ID offers a patented true dual-element design that is ideal for use in circuits with high inrush currents. Superior performance characteristics of JTD_ID Indicator fuses reduce nuisance fuse opening and the blown fuse indication reduces downtime and increases safety..