Littelfuse JLLS350.X POWR-GARD Fast Acting Fuse. Littelfuse POWR-GARD Fast Acting Fuse, Current Limiting, Series: JLLS, Non-Indicating, 350 A, 600 VAC/300 VDC, 20/200 kA Interrupt, Class: T, Knife Blade Terminal, Holder Mounting, Cartridge Body, Melamine, 1.593 in Dia x 3.625 in L Body. Additional Description: LTFS-JLLS350 JLLS350.X FUS 600V F/A CLASS T 350A FUSE 350 AMP SIZE. Catalog Description: Space-saving Class T fuses are the most compact fuses available in ratings above 30 amperes — less than one-third the size of comparable Class R fuses. When rated in accordance with the NEC, Class T fuses provide fast-acting overload and short circuit protection for non-inductive circuits and equipment. Used in inductive circuits, the ampere rating of Class T fuses must be increased to prevent opening on inrush currents. In such instances, Class T fuses may provide only short circuit protection. For motor and general purpose circuits where space is not critical, we recommend POWR-PRO™ JTD_ID Indicator series, LLNRK/LLSRK series, or FLSR_ID Indicator series..