39 general purpose fuses 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) (jlls 1 1200a) 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 90 175 350 700 2 25 50 100 200 400 800 3 30 60 110 225 450 1000 6 35 70 125 250 500 * 1100 10 40 80 150 300 600 1200 15 * jlls only. example part number (series & amperage): jlls 100 recommended fuse blocks lt300 series (for jlln series fuses) lt600 series (for jlls series fuses) refer to fuse block section of this catalog for additional infor- mation. extremely current limiting stops damaging short circuit current faster than any mechanical protective device. fast-acting provides fast-acting overload protection to equipment such as variable speed drives, rectifiers and other equipment containing surge-sensitive components. longer equipment life current limiting design greatly reduces damage to equip- ment 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 compo- nents, such as variable speed drives and rectifiers, fast- acting 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. 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 accor- dance 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. 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. applications 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.
40 general purpose fuses jlln/jlls powr-t class t fuses 300/600 vac fast-acting 1 1200 amperes jlln jlls jlln jlls jlln jlls jlln jlls jlln jlls jlln jlls jlln jlls jlln jlls 1 1 2 3 3 3 3 3 3 1 30 35 60 70 100 110 200 225 400 450 600 700 800 900 1200 amperes refer to fig. no. series dimensions in inches (mm in parentheses) abcdefg 7/8 9/32 13/32 (22.2) (7.1) (10.3) 1-1/2 9/32 9/16 (38.1) (7.1) (14.3) 7/8 9/32 9/16 (22.2) (7.1) (14.3) 1-9/16 13/16 13/32 1 1/16 1-3/32 (39.7) (20.6) (10.3) (25.4) (1.6) (27.8) 2-5/32 1-9/16 3/4 13/16 27/32 9/32 1/8 (54.8) (39.7) (19.1) (20.6) (21.4) (7.1) (3.2) 2-61/64 2-23/64 3/4 13/16 1-41/64 9/32 1/8 (75.0) (59.9) (19.1) (20.6) (41.7) (7.1) (3.2) 2-7/16 1-11/16 7/8 1-1/16 27/32 11/32 3/16 (61.9) (42.9) (22.2) (27.0) (21.4) (8.7) (4.8) 3-1/4 2-1/2 7/8 1-1/16 1-21/32 11/32 3/16 (82.6) (63.5) (22.2) (27.0) (42.1) (8.7) (4.8) 2-3/4 1-27/32 1 1-5/16 53/64 13/32 1/4 (69.9) (46.8) (25.4) (33.3) (21.0) (10.3) (6.4) 3-5/8 2-23/32 1 1-19/32 1-23/32 13/32 1/4 (92.1) (69.1) (25.4) (40.5) (43.7) (10.3) (6.4) 3-1/16 2-1/32 1-1/4 1-19/32 7/8 31/64 5/16 (77.8) (51.6) (31.8) (40.5) (22.2) (12.3) (7.9) 3-63/64 2-61/64 1-1/4 2-1/16 1-49/64 31/64 5/16 (101.2) (75.0) (31.8) (52.4) (44.8) (12.3) (7.9) 3-3/8 2-7/32 1-3/4 2-1/16 7/8 35/64 3/8 (85.7) (64.3) (44.5) (52.4) (22.2) (13.9) (9.5) 4-21/64 3-11/64 1-3/4 2-1/2 1-55/64 35/64 3/8 (109.9) (80.6) (44.5) (63.5) (47.2) (13.9) (9.5) 4 2-17/32 2 2-1/2 1-1/32 39/64 7/16 (101.6) (64.3) (50.8) (63.5) (26.2) (15.5) (11.1) 5.27 3.80 2 2.63 2.30 .67 .44 (133.9) (96.5) (50.8) (66.8) (58.4) (15.5) (11.2) b c a f d f e a b c d g a c d fig. 1 fig. 2 fig. 3
41 general purpose fuses jlln/jlls powr-t class t fuses 300/600 vac fast-acting 1 1200 amperes 1000 800 600 400 300 200 100 80 60 40 30 20 10 8 6 4 3 2 1 .8 .6 .4 .3 .2 .1 .08 .06 .04 .03 .02 .01 200 300 400 600 800 1000 2000 3000 4000 6000 8000 10000 20000 30000 40000 60000 80000 100000 8 10 20 30 40 60 80 100 5 30a 60a 100a 200a 400a 600a 800a 1200a time in seconds current in amperes 1000 800 600 400 300 200 100 80 60 40 30 20 10 8 6 4 3 2 1 .8 .6 .4 .3 .2 .1 .08 .06 .04 .03 .02 .01 200 300 400 600 800 1000 2000 3000 4000 6000 8000 10000 20000 30000 40000 60000 80000 100000 8 10 20 30 40 60 80 100 5 30a 60a 100a 200a 400a 600a 800a time in seconds current in amperes 2000 3000 4000 6000 8000 10000 20000 30000 40000 60000 80000 100000 200000 100 200 300 400 600 800 1000 100 200 300 400 600 800 1000 2000 3000 4000 6000 8000 10000 20000 30000 40000 60000 80000 100000 200000 300000 400000 600000 800000 1000000 1200a 800a 600a 400a 200a 100a 60a 30a peak let-thru in amperes available fault current symmetrical r. m. s. amperes 2000 3000 4000 6000 8000 10000 20000 30000 40000 60000 80000 100000 200000 100 200 300 400 600 800 1000 100 200 300 400 600 800 1000 2000 3000 4000 6000 8000 10000 20000 30000 40000 60000 80000 100000 200000 300000 400000 600000 800000 1000000 800a 600a 400a 200a 100a 60a 30a peak let-thru in amperes available fault current symmetrical r. m. s. amperes jlls jlln jlls jlln
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