Littelfuse LLNRK 4A CLASS RK1 Fuse, Dual Element, Time-Delay, 250Vac/125Vdc, LLNRK004

RK1 fuses are extremely current-limiting fuses meaning they greatly reduce or eliminate damage to circuits and equipment under short-circuit conditions. Replacing existing Class H, K and RK5 fuses with RK1 fuses is one of the easiest ways to immediately improve the protection of plant workers and equipment.