LLNRK/LLSRK Series POWR-PRO® Class RK1
250/600 VAC ■ Dual-Element, Time-Delay ■ 1/10 –600 Amperes

Littelfuse LLNRK and LLSRK series POWR-PRO® fuses provide superior overload and short circuit protection for
service entrance, main, feeder and general-purpose branch circuits up to 600 amperes.

FEATURES/BENEFITS
■Extremely current limiting — Reduces damage to circuits and equipment under short-circuit conditions. Stops
damaging short circuits faster than any mechanical protective device.
■300kA Interrupting Rating —Littelfuse self-certified to 300,000 amperes as standard. Meets future trend towards higher available short circuit currents.
■Reduced costs —Current limiting design often permits use of readily available, less costly equipment. Low
resistance design reduces power consumption and utility bills.
■Excellent time delay —True dual-element construction, with separate non-fatiguing thermally-reversible spring
loaded thermal overload element, withstands repeated surges within rated time delay without opening needlessly. Eliminates needless downtime caused by power surges or equipment demands.

APPLICATIONS
All general-purpose circuits
Motors
Transformers
Solenoids
Fluorescent lighting
All system components with high in-rush currents