Littelfuse Fuses

Littelfuse Class L fuses include KLPC series fuses for AC circuits from 601 to 6000 amperes, as well as LDC series fuses for AC and DC circuits available from 601 to 2000 amperes. When facilities have a combination of large AC and DC circuits, standardizing to LDC series for all Class L fuses should be considered. This eliminates the possibility that an AC-only fuse will be used in a DC circuit and reduces inventory.

Littelfuse Class RK5 fuses provide protection for electrical systems that are 600 amps and smaller, and have available short-circuit currents less than 100,000 amperes. The FLSR_ID indicator series fuses provide superior time-delay protection, plus they have the patented indicating window that immediately shows which fuses are blown.

Littelfuse Class RK1 fuses provide time-delay protection where fault currents exceed 100,000 amperes. The LLSRK series reduces short-circuit damage to full-size NEMA and sensitive IEC motor controllers and is capable of providing Type 2 “no damage” protection to NEMA size motor starters. The LLSRK_ID series provides the patented indicating window design.

Littelfuse Class J fuses provide the amount of time-delay necessary for most applications and are substantially smaller than RK5 or RK1 fuses with current-limitation equal to the RK1 fuse. The JTD_ID series fuses provide IEC Type 2 protection to both IEC and NEMA control components and motor controllers.

Littelfuse Class CC fuses are installed in LEC or LEB weatherproof fuse holders in the base of lighting standards and withstand corrosive and wet conditions. Fusing each lighting fixture eliminates the need to test the entire circuit when only one fails.

Littelfuse Class K5 fuses are “one-time” fuses that provide low cost protection for general-purpose feeder and branch circuits when available short-circuit currents are less than 50,000 amperes. They are suitable for use in many residential and smaller commercial and industrial applications.