FLNR/FLSR Class RK5 Fuses 250/600 VAC ■ Dual-Element, Time-Delay ■ 1/10 – 600 Amperes SPECIFICATIONS Voltage Ratings: AC: 250 Volts (FLNR); 600 Volts (FLSR) DC: 125 Volts (FLNR) 300 Volts (FLSR) Interrupting Ratings: AC: 200,000 amperes rms symmetrical DC: 20,000 amperes Ampere Range: 1/10 – 600 amperes Approvals: Standard 248-12, Class RK5 UL Listed (File No: E81895) CSA Certified (File No: LR29862) MSHA 300 Volt Listing (FLSR) QPL: Federal Specification WF-1814 AMPERE RATINGS 6 ⁄10 ⁄10 18⁄10 4 8 30 80 8 ⁄8 ⁄10 2 41⁄2 9 35 90 15 ⁄100 1 21⁄4 5 10 40 100 2 ⁄10 11⁄8 21⁄2 56⁄10 12 45 110 1 ⁄4 11⁄4 28⁄10 6 15 50 125 3 ⁄10 ** 14⁄10 3 61⁄4 171⁄2 60 150 4 ⁄10 11⁄2 32⁄10 7 20 70 175 1 ⁄2 16⁄10 31⁄2 71⁄2 25 75* 200 **FLNR only, *FLSR only Example part number (series & amperage): FLSR100 1 1 225 250 300 350 400 450 500 600 RECOMMENDED FUSE BLOCKS Littelfuse FLNR/FLSR series fuses have been the superior UL Class RK5 dual-element time-delay fuses, and are the most widely used class of fuses. FLNR/FLSR series fuses provide excellent protection for all types of circuits especially those containing motors. However, users and specifiers should consider the significant benefits offered by Indicator fuses. Complete information on these fuses may be found in this section of this catalog. APPLICATIONS LR250 series (for FLNR series fuses) LR600 series (for FLSR series fuses) Refer to Fuse Block section of this catalog for additional information. DIMENSIONS Refer to FLNR_ID series for FLNR dimensions and FLSR_ID series for FLSR dimensions. Service entrance switches Switchboard main and feeder switches Motor control center mains and motor branch circuits Individual fused combination motor controllers Distribution panelboards Industrial control panels Protection of fully-rated panelboards and loadcenters All general purpose circuits SAFETY ■ ■ 200,000 A.I.R. — Reliable interruption of all overcurrents up to 200,000 amperes. Faster acting short circuit protection than any non-current limiting mechanical protective device. LONGER EQUIPMENT LIFE ■ ■ Reduced damage to equipment caused by heating and magnetic forces of short circuits. Equipment runs cooler with low-resistance dual-element fuses. RELIABILITY ■ Accurate and reliable — Automated, precision manufactured and assembled parts ensure accurate, consistent response to overloads and short circuits. 31