JLLN/JLLS POWR-T™ Class T Fuses 300/600 VAC ■ Fast-Acting ■ 1 – 1200 Amperes SPECIFICATIONS Voltage ratings: AC: 300 Volts (JLLN); 600 Volts (JLLS) DC: 125 Volts (JLLN 110 – 1200A); 300 Volts (JLLS) Interrupting ratings:AC: 200,000 amperes rms symmetrical DC: 20,000 amperes (JLLN 110 – 1200A) GENERAL (JLLS 1 – 1200A) PURPOSE FUSES Ampere range: 1– 1200 amperes Approvals: AC: UL Listed Class T per UL 248 (formerly UL 198H) (File No. E81895): JLLN/JLLS (1 – 800A) UL Recognized ( ) (File No. E71611): JLLS (900 – 1200A) CSA Certified HRCI-T (File No. LR29862): JLLN/JLLS (1 – 600A) DC: Additionally UL Listed per UL 198L: JLLN (110 – 1200A) (File No. E81895) JLLS 300 VDC is Littelfuse self-certified AMPERE RATINGS 1 20 45 90 175 2 25 50 100 200 3 30 60 110 225 6 35 70 125 250 10 40 80 150 300 15 * JLLS only. Example part number (series & amperage): 350 400 450 500 600 700 800 1000 *1100 1200 JLLS 100 RECOMMENDED FUSE BLOCKS Space saving POWR-T fuses are the most compact fuses available in ratings above 30 amperes — less than one-third the size of comparable Class R fuses. When rated in accordance with the NEC, POWR-T fuses provide fast-acting overload and short circuit protection for non-inductive circuits and equipment. Used in inductive circuits, the ampere rating of POWR-T fuses must be increased to prevent opening on inrush currents. In such instances, POWR-T fuses may provide only short circuit protection. ™ LT300 series (for JLLN series fuses) LT600 series (for JLLS series fuses) Refer to Fuse Block section of this catalog for additional information. ■ Extremely current limiting — Stops damaging short circuit current faster than any mechanical protective device. For motor and general purpose circuits where space is not critical, we recommend POWR-PRO® JTD_ID Indicator series, LLNRK/LLSRK series, or FLSR_ID Indicator series. ■ Fast-acting — Provides fast-acting overload protection to equipment such as variable speed drives, rectifiers and other equipment containing surge-sensitive components. APPLICATIONS LONGER EQUIPMENT LIFE Protection of individual electric services and meters. ■ Main switches containing Class T fuses may be used to provide compact protection for meter stacks. Molded case circuit breaker load centers and panelboards have increased interrupting ratings when “series rated” with Littelfuse Class T fuses. Refer to panelboard manufacturers’ literature for UL Listed combination of fuses and panelboards. Series ratings up to 200,000 amperes are available. SPACE-SAVING Typical three-pole Class T fuse blocks require less than 50% of the panel area required for Class R fuse blocks. Switch enclosures, fuse pullouts, and other equipment using Class T fuses are often correspondingly more compact. SAFETY ■ 200,000 A.I.R. — Reliable interruption of all overcurrents up to 200,000 amperes. Current limiting design greatly reduces damage to equipment caused by heating and magnetic effects of short circuit currents. ECONOMICAL ■ Extremely current limiting design often permits use of readily available, less costly equipment. ■ Used as input or output fuses for surge-sensitive components, such as variable speed drives and rectifiers, fastacting POWR-T JLLN/JLLS fuses may prevent opening of expensive semiconductor fuses protecting individual components. NOTE: JLLN Class T 300 volt fuses are UL listed for circuits not exceeding 300 volts to ground. However, since UL does not include testing 300 volt Class T fuses on 277/480 volt three-phase bolted faults, Littelfuse does not recommend using 300 volt Class T fuses where phase-to-phase voltage exceeds 300 volts. 39 JLLN/JLLS POWR-T™ Class T Fuses 300/600 VAC ■ Fast-Acting ■ 1 – 1200 Amperes C GENERAL PURPOSE FUSES D D B C A Fig. 1 1 – 30 35 – 60 70 – 100 110 – 200 225 – 400 450 – 600 700 –800 900 – 1200 40 REFER TO FIG. NO. C F F E A A AMPERES G B Fig. 2 D Fig. 3 DIMENSIONS IN INCHES (mm in parentheses) SERIES A B C D E F G JLLN 7/8 (22.2) — 9/32 (7.1) 13/32 (10.3) — — — JLLS 1-1/2 (38.1) — 9/32 (7.1) 9/16 (14.3) — — — 1 JLLN 7/8 (22.2) — 9/32 (7.1) 9/16 (14.3) — — — 2 JLLS 1-9/16 (39.7) 13/16 (20.6) 13/32 (10.3) 1 (25.4) 1/16 (1.6) 1-3/32 (27.8) — JLLN 2-5/32 (54.8) 1-9/16 (39.7) 3/4 (19.1) 13/16 (20.6) 27/32 (21.4) 9/32 (7.1) 1/8 (3.2) JLLS 2-61/64 (75.0) 2-23/64 (59.9) 3/4 (19.1) 13/16 (20.6) 1-41/64 (41.7) 9/32 (7.1) 1/8 (3.2) JLLN 2-7/16 (61.9) 1-11/16 (42.9) 7/8 (22.2) 1-1/16 (27.0) 27/32 (21.4) 11/32 (8.7) 3/16 (4.8) JLLS 3-1/4 (82.6) 2-1/2 (63.5) 7/8 (22.2) 1-1/16 (27.0) 1-21/32 (42.1) 11/32 (8.7) 3/16 (4.8) JLLN 2-3/4 (69.9) 1-27/32 (46.8) 1 (25.4) 1-5/16 (33.3) 53/64 (21.0) 13/32 (10.3) 1/4 (6.4) JLLS 3-5/8 (92.1) 2-23/32 (69.1) 1 (25.4) 1-19/32 (40.5) 1-23/32 (43.7) 13/32 (10.3) 1/4 (6.4) JLLN 3-1/16 (77.8) 2-1/32 (51.6) 1-1/4 (31.8) 1-19/32 (40.5) 7/8 (22.2) 31/64 (12.3) 5/16 (7.9) JLLS 3-63/64 (101.2) 2-61/64 (75.0) 1-1/4 (31.8) 2-1/16 (52.4) 1-49/64 (44.8) 31/64 (12.3) 5/16 (7.9) JLLN 3-3/8 (85.7) 2-7/32 (64.3) 1-3/4 (44.5) 2-1/16 (52.4) 7/8 (22.2) 35/64 (13.9) 3/8 (9.5) JLLS 4-21/64 (109.9) 3-11/64 (80.6) 1-3/4 (44.5) 2-1/2 (63.5) 1-55/64 (47.2) 35/64 (13.9) 3/8 (9.5) JLLN 4 (101.6) 2-17/32 (64.3) 2 (50.8) 2-1/2 (63.5) 1-1/32 (26.2) 39/64 (15.5) 7/16 (11.1) JLLS 5.27 (133.9) 3.80 (96.5) 2 (50.8) 2.63 (66.8) 2.30 (58.4) .67 (15.5) .44 (11.2) 1 3 3 3 3 3 3 JLLN/JLLS POWR-T™ Class T Fuses 300/600 VAC Fast-Acting ■ ■ 1 – 1200 Amperes 400 300 400 300 200 200 100 80 60 100 80 60 40 30 40 30 20 20 10 8 6 10 8 6 CURRENT IN AMPERES 800A 600A 400A 200A 60000 80000 100000 30000 40000 20000 6000 8000 10000 3000 4000 2000 600 800 1000 300 400 200 60000 80000 100000 30000 40000 20000 6000 8000 10000 3000 4000 2000 200 600 800 1000 .01 300 400 .02 .01 60 80 100 .04 .03 .02 30 40 .04 .03 20 .1 .08 .06 8 10 .2 .1 .08 .06 CURRENT IN AMPERES JLLS 1000000 800000 600000 1000000 800000 600000 400000 300000 400000 300000 200000 200000 2000 200000 60000 80000 100000 30000 40000 20000 100 6000 8000 10000 100 3000 4000 200 2000 200 600 800 1000 400 300 300 400 400 300 200 1000 800 600 100 1000 800 600 AVAILABLE FAULT CURRENT SYMMETRICAL R. M. S. AMPERES 30A 4000 3000 200000 2000 100A 60A 60000 80000 100000 4000 3000 10000 8000 6000 30000 40000 60A 30A 20000 100A 6000 8000 10000 10000 8000 6000 200A 3000 4000 200A 400A 20000 2000 20000 800A 600A 40000 30000 300 400 40000 30000 100000 80000 60000 200 1200A 800A 600A 400A PEAK LET-THRU IN AMPERES 100000 80000 60000 100 JLLN 600 800 1000 5 .4 .3 .2 60 80 100 1 .8 .6 .4 .3 PEAK LET-THRU IN AMPERES 100A 2 30 40 1 .8 .6 20 2 4 3 5 4 3 GENERAL PURPOSE FUSES 8 10 TIME IN SECONDS 1000 800 600 TIME IN SECONDS 1000 800 600 60A 30A 1200A 800A 400A 600A 200A 100A 60A JLLS 30A JLLN AVAILABLE FAULT CURRENT SYMMETRICAL R. M. S. AMPERES 41