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LLNRK/LLSRK Series POWR-PRO(R) Class RK1
250/600 VAC
s
Dual-Element, Time-Delay
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1/10 - 600 Amperes
SPECIFICATIONS
Voltage Ratings: AC: 250 Volts (LLNRK) 600 Volts (LLSRK) DC: 125 Volts (LLNRK) 300 Volts (LLSRK) Interrupting Ratings: AC: 200,000 amperes rms symmetrical 300,000 amperes rms symmetrical (Littelfuse self-certified) DC: 20,000 amperes Ampere Range: 1/10 - 600 amperes Approvals: AC: Standard 248-12, Class RK1 UL Listed (File No: E81895) CSA Certified (File No: LR29862) QPL: Federal Specification No.WF-1814 DC: Littelfuse self-certified
AMPERE RATINGS
1 10 15 100
4 * 3 10 4 10 1 2 6 10 8 10
2 10 1
1 118 114 1410 1610 1810 2 214 212
2810 3 3210 312 4 412 5 5610 6
614 7 8 9 10 12 15 1712 20
25 30 35 40 45 50 60 70 80
90 100 110 125 150 175 200 225 250
300 350 400 450 500 600
* LLSRK Only. Example part number (series & amperage): LLNRK 450
RECOMMENDED FUSE BLOCKS
LR250 series (LLNRK Series) LR600 series (LLSRK Series) Refer to Fuse Block section of this catalog for additional information.
Littelfuse LLNRK and LLSRK series POWR-PRO(R) 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.
FEATURES/BENEFITS
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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 springloaded thermal overload element, withstands repeated surges within rated time delay without opening needlessly. Eliminates needless downtime caused by power surges or equipment demands.
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APPLICATIONS
All general-purpose circuits Motors Transformers Solenoids Fluorescent lighting All system components with high in-rush currents
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LLNRK/LLSRK Series POWR-PRO(R) Class RK1
250/600 VAC
s
Dual-Element, Time-Delay
A F
s
1/10 - 600 Amperes
A K C B F D E G
G E
B C
D H J
70-600A
FIG. 1
AMPERES REFER TO FIG. NO. SERIES A LLNRK 1/10 - 30 1 LLSRK LLNRK 35 - 60 1 LLSRK LLNRK 70 - 100 2 LLSRK LLNRK 110 - 200 2 LLSRK LLNRK 225 - 400 2 LLSRK LLNRK 450 - 600 2 LLSRK 2 (50.8) 5 (127.0) 3 (76.2) 5-1/2 (139.7) 5-7/8 (149.2) 7-7/8 (200.0) 7-1/8 (181.0) 9-5/8 (244.5) 8-5/8 (219.1) 11-5/8 (295.3) 10-3/8 (263.5) 13-3/8 (339.7) B 1/2 (12.7) 3/4 (19.1) 3/4 (19.1) 1 (25.4) 1 (25.4) 1-1/4 (31.8) 1-1/2 (38.1) 1-3/4 (44.5) 2 (50.8) 2-1/2 (63.5) 2-1/2 (63.5) 3 (76.2) C 1/2 (12.7) 5/8 (15.9) 5/8 (15.9) 5/8 (15.9) 1-1/16 (27.0) 1-1/16 (27.0) 1-15/32 (37.3) 1-15/32 (37.3) 1-15/16 (49.2) 2 (50.8) 2-3/8 (60.3) 2-13/32 (61.1)
FIG. 2
DIMENSIONS IN INCHES (mm in parentheses) D 9/16 (14.3) 13/16 (20.6) 13/16 (20.6) 1-1/16 (27.0) 1-1/16 (27.0) 1-5/16 (33.3) 1-19/32 (40.5) 1-27/32 (46.8) 2-3/32 (53.2) 2-19/32 (65.9) 2-19/32 (65.9) 3-3/32 (78.6) E 5/64 (2.0) 3/32 (2.4) 3/32 (2.4) 3/32 (2.4) 1/8 (3.2) 1/8 (3.2) 3/16 (4.8) 3/16 (4.8) 1/4 (6.4) 1/4 (6.4) 1/4 (6.4) 1/4 (6.4) F 5/32 (4.0) 3/16 (4.8) 3/16 (4.8) 1/4 (6.4) 3/4 (19.1) 3/4 (19.1) 1-1/8 (28.6) 1-1/8 (28.6) 1-5/8 (41.3) 1-5/8 (41.3) 2 (50.8) 2 (50.8) G 3/8 (9.5) 5/8 (15.9) 5/8 (15.9) 7/8 (22.2) 1-1/4 (31.8) 1-1/2 (38.1) 1-27/32 (46.8) 2-3/32 (53.2) 2-11/32 (59.5) 2-27/32 (72.2) 2-27/32 (72.2) 3-11/32 (84.93) H -- -- -- -- 1/4 (6.4) 1/4 (6.4) 7/16 (11.1) 7/16 (11.1) 5/8 (15.9) 5/8 (15.9) 3/4 (19.1) 3/4 (19.1) J -- -- -- -- 9/32 (7.1) 9/32 (7.1) 9/32 (7.1) 9/32 (7.1) 13/32 (10.3) 13/32 (10.3) 17/32 (13.5) 17/32 (13.5) K -- -- -- -- 1/2 (12.7) 1/2 (12.7) 11/16 (17.5) 11/16 (17.5) 15/16 (23.8) 15/16 (23.8) 1-1/8 (28.6) 1-1/8 (28.6)
LLNRK
100A 200A 400A 600A 15A 30A 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 60A
LLSRK
100A 200A 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 400A 600A 600 800 1000 2000 15A 30A 30 40 60A 60 80 100
TIME IN SECONDS
TIME IN SECONDS
5
8 10
20
200
300 400
3000 4000
6000 8000 10000
20000
30000 40000
CURRENT IN AMPERES
60000 80000 100000
CURRENT IN AMPERES
60000 80000 100000
5
8 10
20
30 40
60 80 100
200
300 400
600 800 1000
2000
3000 4000
6000 8000 10000
20000
30000 40000
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LLNRK/LLSRK Series POWR-PRO(R) Class RK1
250/600 VAC
s
Dual-Element, Time-Delay
s
1/10 - 600 Amperes
Current-Limiting Effects of LLNRK (250V) fuses
* Prospective RMS Symmetrical Amperes Short-Circuit Current ** Apparent RMS Symmetrical Note: Data derived from Peak Let-Thru Curves
Current-Limiting Effects of LLSRK (600V) fuses
* Prospective RMS Symmetrical Amperes Short-Circuit Current ** Apparent RMS Symmetrical Note: Data derived from Peak Let-Thru Curves
Short Circuit Current* 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 50,000 60,000 80,000 100,000 150,000 200,000
30A 900 1,100 1,250 1,400 1,500 1,600 1,700 1,800 1,900 2,000 2,200 2,300 2,500 2,600
Peak Let-Thru Current** for various fuse ratings 60A 100A 200A 400A 1,400 2,000 2,700 4,800 1,900 2,700 3,500 6,200 2,100 3,100 4,200 7,000 2,400 3,500 4,600 8,000 2,600 3,900 5,000 8,300 2,800 4,000 5,250 9,000 2,850 4,300 5,500 9,500 3,000 4,600 5,800 9,800 3,200 4,800 6,300 10,200 3,500 5,200 6,700 11,000 3,900 5,700 7,200 12,200 4,000 6,000 8,100 12,700 4,500 6,700 9,100 14,000 4,800 7,000 9,700 15,000
600A 5,000 8,500 9,500 10,800 11,500 12,000 12,500 13,500 14,000 15,000 16,000 17,000 19,000 20,000
Short Circuit Current* 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 50,000 60,000 80,000 100,000 150,000 200,000
30A 1,060 1,350 1,600 1,700 1,900 2,000 2,100 2,200 2,400 2,500 2,700 2,900 3,200 3,300
Peak Let-Thru Current** for various fuse ratings 60A 100A 200A 400A 1,600 2,100 2,600 4,100 2,000 2,800 3,400 5,250 2,300 3.200 3,900 6,000 2,600 3,600 4,500 6,700 2,800 3,800 4,800 7,500 3,000 4,100 5,200 8,000 3,100 4,400 5,700 8,500 3,300 4,600 6,000 9,000 3,500 4,900 6,500 9,500 3,800 5,200 7,000 10,000 4,000 5,700 7,750 11,000 4,200 6,200 8,500 12,000 4,600 7,300 10,000 14,000 4,700 8,000 11,000 16,000
600A -- 8,000 9,000 10,000 11,000 12,000 12,500 13,000 14,000 15,000 17,000 18,000 21,000 23,000
LLNRK
1000000 800000 600000 400000 300000 200000 100000 80000 60000
LLSRK
1000000 800000 600000 400000 300000 200000 100000 80000 60000
PEAK LET-THRU IN AMPERES
40000 30000 20000 10000 8000 6000 4000 3000 2000 1000 800 600 400 300 200 100 100 200 300 400 600 800 1000 2000 3000 4000 6000 8000 10000 20000 30000 40000 60000 80000 100000 200000
PEAK LET-THRU IN AMPERES
600A 400A 200A 100A 60A 30A
600A 400A 200A 100A 60A 30A
40000 30000 20000 10000 8000 6000 4000 3000 2000 1000 800 600 400 300 200 100 100 200 300 400 600 800 1000 2000 3000 4000 6000 8000 10000 20000 30000 40000 60000 80000 100000 200000
AVAILABLE FAULT CURRENT SYMMETRICAL R. M. S. AMPERES
AVAILABLE FAULT CURRENT SYMMETRICAL R. M. S. AMPERES
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