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. LLNRK/LLSRK series fuses can be installed in existing Class H fuse blocks to upgrade systems containing lower interrupting rating Class H one-time or renewable fuses.

• Applications
• All general-purpose circuits
• Motors
• Transformers
• Solenoids
• Fluorescent lighting
• All system components with high in-rush currents
• Product Features
• 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.

• Specifications
• Ampere Rating (A) : 600
• VAC (V) : 250
• VDC (V) : 125
• Interrupting Rating : 20000A@125VDC
• Opening : Slo-Blo/Time Lag (T)/Time Delay
• Package Size : Knife-Blade