General Purpose Fuses KLLU Class L Fuses 600 VAC • Time-Delay • 601 – 4000 Amperes Applications General Purpose Fuses Service switches Switchboard mains and feeders Bolted pressure contact switches Motor control center mains Large motor branch circuits UL Listed series rated protection for molded case circuit breaker panelboards and loadcenters. See panelboard manufacturers’ literature for recommended fuse rating. Safety • 200,000 A.I.R. — Provides reliable interruption of all overcurrents up to 200,000 amperes. • When used for motor branch circuit protection, KLLU fuses may be sized close to the motor full load current, providing excellent protection to branch circuit conductors, motor control equipment and motors. Longer Equipment Life KLLU series UL Listed, time-delay, Class L fuses are quality fuses, developed to provide a somewhat lower priced alternate to the POWR-PRO® KLPC series fuses. KLLU series fuses meet or exceed all UL requirements for Class L fuses. For superior protection and performance, specification-grade POWR-PRO KLPC series fuses are the recommended fuse. Complete information on KLPC fuses may be found in the POWR-PRO Fuse section of this catalog. • Current-Limiting — Reduces short-circuit damage to systems and equipment. • Reduced downtime. • Ten second minimum time-delay at 500% current eliminates needless downtime caused by heavy starting currents of large motors and other inductive loads. • Selective coordination — KLLU fuses coordinate well with other Class L fuses and with all current-limiting Littelfuse fuses rated 600 amps or less. This means less time spent trying to locate shortcircuits or overloaded equipment, because only the fuse immediately on the line side of the affected circuit opens. Easy To Use • 200,000 A.I.R. rating minimizes need for short-circuit calculations, while meeting present and future system requirements. • KLLU fuse time-current characteristics closely match typical timecurrent curves of circuit breakers. Although fuse/circuit breaker systems can seldom be 100% coordinated, KLLU series fuses permit use of a wider range of breaker setting than fast acting Class L fuses. Excellent protection for a single breaker or a group of breakers. Specifications Voltage Ratings: Interrupting Ratings: Ampere Range: Approvals: 26 Ampere Ratings AC: 600 Volts DC: Contact factory 200,000 amperes rms symmetrical 601 – 4000 amperes Standard 248-10, Class L UL Listed (File No: E81895) CSA Certified (File No: LR29862) 601 650 700 750 800 900 1000 1200 1350 1400 1500 1600 1800 2000 2500 3000 3500 4000 Example part number (series & amperage): KLLU 1000 www.littelfuse.com © 2005 Littelfuse • POWR-GARD™ Products Catalog General Purpose Fuses KLLU Class L Fuses 600 VAC • Time-Delay • 601 – 4000 Amperes J D E F C B A M N M FIG.1 H C B A General Purpose Fuses F C B A J J D E F N M G FIG.2 FIG. 3 J H C B A D E F L K N M G FIG. 4 Dimensions In Inches (mm in parentheses) Fig. No. A B C 1 3 3 ⁄4 (95.3) 53 ⁄4 (146.1) 63 ⁄4 (171.5) 801 – 1200 2 3 ⁄4 (95.3) 5 ⁄4 (146.1) 1201 – 1600 2 33 ⁄ 4 (95.3) 1601 – 2000 2 2001 – 2500 Amperes E F — — 8 5 ⁄8 (219.1) 6 ⁄4 (171.5) 9 ⁄4 (235.0) 9 ⁄2 (241.3) 10 ⁄ 4 (273.1) 53 ⁄4 (146.1) 63 ⁄4 (171.5) 91⁄ 4 (235.0) 9 1⁄ 2 (241.3) 33 ⁄ 4 (95.3) 53 ⁄4 (146.1) 63 ⁄4 (171.5) 91⁄ 4 (235.0) 3 4 (101.6) 53 ⁄4 (146.1) 6 3 ⁄4 (171.5) 2501 – 3000 3 4 (101.6) 53 ⁄4 (146.1) 6 3 ⁄4 (171.5) 3001 – 4000 4 (101.6) 601 – 800 3 4 3 53 ⁄ 4 (146.1) 3 63 ⁄ 4 (171.5) © 2005 Littelfuse • POWR-GARD™ Products Catalog D H J K — 2 (50.8) 2 1⁄ 2 (63.5) — — 2 (50.8) 2 ⁄2 (63.5) (9.5) 103 ⁄ 4 (273.1) — — 2 3 ⁄8 (60.3) 3 (76.2) (11.1) 9 1⁄ 2 (241.3) 103 ⁄ 4 (273.1) — — 23 ⁄ 4 (69.9) 31⁄ 2 (88.9) (12.7) 91⁄ 4 (235.0) 9 1⁄ 2 (241.3) 103 ⁄ 4 (273.1) 15 ⁄ 8 (41.3) 13 ⁄ 4 (44.5) 31⁄ 2 (88.9) 5 (127.0) (19.1) 91⁄ 4 (235.0) 9 1⁄ 2 (241.3) 103 ⁄ 4 (273.1) 15 ⁄ 8 (41.3) 13 ⁄ 4 (44.5) 4 (101.6) 5 (127.0) 91⁄2 103 ⁄4 (273.1) 13 ⁄4 (44.5) 3 1⁄4 (82.6) 43 ⁄ 4 (120.7) 53 ⁄ 4 (146.1) 1 91⁄ 4 (235.0) 1 (241.3) 3 G — www.littelfuse.com 1 L M N (9.5) ⁄8 x 11 ⁄8 (15.9) x (28.6) — ⁄8 5 ⁄8 x 3 ⁄4 (15.9) x (19.1) 5 ⁄8 x 11 ⁄ 8 (15.9) x (28.6) ⁄16 5 ⁄8 x 3 ⁄4 (15.9) x (19.1) 5 ⁄ 8 x 11 ⁄8 (15.9) x (28.6) ⁄2 5 ⁄8 x 3 ⁄4 (15.9) x (19.1) 5 ⁄8 x 11 ⁄ 8 (15.9) x (28.6) ⁄4 5 ⁄8 x 3 ⁄4 (15.9) x (19.1) 5 ⁄8 x 11 ⁄8 (15.9) x (28.6) (19.1) ⁄4 5 ⁄8 x 3 ⁄4 (15.9) x (19.1) 5 ⁄ 8 x 11 ⁄8 (15.9) x (28.6) 3 ⁄4 (19.1) 5 ⁄8 x 13 ⁄ 8 (15.9) x (34.9) 5 ⁄8 x 13 ⁄8 (15.9) x (34.9) ⁄8 3 3 7 1 3 3 5 27 General Purpose Fuses KLLU Class L Fuses 600 VAC • Time-Delay • 601 – 4000 Amperes Current-Limiting Effects of KLLU (600V) fuses Apparent RMS Symmetrical Current for Various Fuse Ratings General Purpose Fuses Short-Circuit Current* 800A 1200A 1600A 2000A 3000A 4000A 5,000 5,000 5,000 5,000 5,000 5,000 5,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000 15,000 11,900 15,000 15,000 15,000 15,000 15,000 20,000 13,000 18,500 20,000 20,000 20,000 20,000 25,000 14,000 20,000 25,000 25,000 25,000 25,000 30,000 14,500 21,000 26,500 30,000 30,000 30,000 35,000 35,000 15,000 22,000 28,500 34,000 35,000 40,000 16,000 23,000 30,000 35,000 37,000 40,000 50,000 17,000 24,000 32,000 38,000 39,000 44,000 60,000 18,000 26,000 34,000 42,000 43,000 50,000 80,000 19,000 28,000 36,000 44,000 46,000 54,500 100,000 21,000 30,000 38,000 46,000 48,000 57,500 150,000 24,000 35,000 44,000 50,000 51,000 68,000 200,000 26,000 38,000 48,000 53,000 60,000 74,000 601A 800A 1200A 1600A 2000A 3000A 3500A 4000A * Prospective RMS Symmetrical Amperes Short-Circuit Current Note: Data Derived from Peak Let-Thru Curves 10000000 1000 800 600 400 300 200 100 80 60 1000000 PEAK LET-THRU IN AMPERES 40 30 TIME IN SECONDS 20 10 8 6 4 3 2 1 .8 .6 .4 .3 4000A 3000A 2000A 1600A 1200A 800A 100000 10000 .2 .1 .08 .06 CURRENT IN AMPERES 565001 28 www.littelfuse.com 200000 AVAILABLE FAULT CURRENT SYMMETRICAL R.M.S. AMPERES 100000 100 600000 800000 1000000 300000 400000 200000 60000 80000 100000 30000 40000 20000 6000 8000 10000 3000 4000 2000 600 800 1000 300 400 200 50 1000 80 100 .01 10000 .02 1000 .04 .03 © 2005 Littelfuse • POWR-GARD™ Products Catalog