12
LLNRK/LLSRK Series POWR-PRO®Class RK1
250/600 VA C ■Dual-Element, Time-Dela y ■1/10 – 600 Amperes
SPECIFICATIONS
Voltage Ratings: A C: 250 Volts (LLNRK)
600 Volts (LLSRK)
DC: 125 Volts (LLNRK)
300 Volts (LLSRK)
Interrupting Ratings:
AC: 200,000 amperes r ms symmetr ical
300,000 amperes rms symmetr ical
(Littelfuse self-cer tified)
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:F ederal Specification No .WF-1814
DC: Littelfuse self-certified
AMPERE RATINGS
1⁄10 12
8⁄10 61⁄425 90 300
15⁄100 11⁄83 7 30 100 350
2⁄10 11⁄432⁄10 8 35 110 400
1⁄4*14⁄10 31⁄29 40 125 450
3⁄10 16⁄10 4 10 45 150 500
4⁄10 18⁄10 41⁄212 50 175 600
1⁄2251560200
6⁄10 21⁄456⁄10 171⁄270 225
8⁄10 21⁄26 2080250
* LLSRK Only.
Example par t number (series & amperage): LLNRK 450
RECOMMENDED FUSE BLOCKS
LR250 series (LLNRK Ser ies)
LR600 series (LLSRK Ser ies)
Refer to Fuse Block section of this catalog for additional
information.
FEATURES/BENEFITS
■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 constr uction,
with separate non-fatiguing thermally-reversible spring-
loaded thermal overload element, withstands repeated
surges within rated time delay without opening needlessly.
Eliminates needless downtime caused by power surges or
equipment demands.
Littelfuse LLNRK and LLSRK series POWR-PRO®fuses
provide superior overload and short circuit protection for
ser vice 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 interrupt-
ing rating Class H one-time or renewable fuses.
APPLICATIONS
All general-purpose circuits
Motors
Transformers
Solenoids
Fluorescent lighting
All system components with high in-rush currents
13
LLNRK/LLSRK Series POWR-PRO®Class RK1
250/600 VA C ■Dual-Element, Time-Dela y ■1/10 – 600 Amperes
LLNRK
LLSRK
LLNRK
LLSRK
LLNRK
LLSRK
LLNRK
LLSRK
LLNRK
LLSRK
LLNRK
LLSRK
1
1
2
2
2
2
1/10 – 30
35 – 60
70 – 100
110 – 200
225 – 400
450 – 600
AMPERES REFER TO
FIG. NO. SERIES DIMENSIONS IN INCHES (mm in parentheses)
2 1/2 1/2 9/16 5/64 5/32 3/8 ———
(50.8) (12.7) (12.7) (14.3) (2.0) (4.0) (9.5)
5 3/4 5/8 13/16 3/32 3/16 5/8 ———
(127.0) (19.1) (15.9) (20.6) (2.4) (4.8) (15.9)
3 3/4 5/8 13/16 3/32 3/16 5/8 ———
(76.2) (19.1) (15.9) (20.6) (2.4) (4.8) (15.9)
5-1/2 1 5/8 1-1/16 3/32 1/4 7/8 ———
(139.7) (25.4) (15.9) (27.0) (2.4) (6.4) (22.2)
5-7/8 1 1-1/16 1-1/16 1/8 3/4 1-1/4 1/4 9/32 1/2
(149.2) (25.4) (27.0) (27.0) (3.2) (19.1) (31.8) (6.4) (7.1) (12.7)
7-7/8 1-1/4 1-1/16 1-5/16 1/8 3/4 1-1/2 1/4 9/32 1/2
(200.0) (31.8) (27.0) (33.3) (3.2) (19.1) (38.1) (6.4) (7.1) (12.7)
7-1/8 1-1/2 1-15/32 1-19/32 3/16 1-1/8 1-27/32 7/16 9/32 11/16
(181.0) (38.1) (37.3) (40.5) (4.8) (28.6) (46.8) (11.1) (7.1) (17.5)
9-5/8 1-3/4 1-15/32 1-27/32 3/16 1-1/8 2-3/32 7/16 9/32 11/16
(244.5) (44.5) (37.3) (46.8) (4.8) (28.6) (53.2) (11.1) (7.1) (17.5)
8-5/8 2 1-15/16 2-3/32 1/4 1-5/8 2-11/32 5/8 13/32 15/16
(219.1) (50.8) (49.2) (53.2) (6.4) (41.3) (59.5) (15.9) (10.3) (23.8)
11-5/8 2-1/2 2 2-19/32 1/4 1-5/8 2-27/32 5/8 13/32 15/16
(295.3) (63.5) (50.8) (65.9) (6.4) (41.3) (72.2) (15.9) (10.3) (23.8)
10-3/8 2-1/2 2-3/8 2-19/32 1/4 2 2-27/32 3/4 17/32 1-1/8
(263.5) (63.5) (60.3) (65.9) (6.4) (50.8) (72.2) (19.1) (13.5) (28.6)
13-3/8 3 2-13/32 3-3/32 1/4 2 3-11/32 3/4 17/32 1-1/8
(339.7) (76.2) (61.1) (78.6) (6.4) (50.8) (84.93) (19.1) (13.5) (28.6)
ABCDEFGHJK
A
F
EC
D
GB
A
J
K
HB
C
FDG
70-600A
FIG. 1 FIG. 2
E
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
15A
30A
60A
100A
200A
400A
600A
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
15A
30A
60A
100A
200A
400A
600A
TIME IN SECONDS
CURRENT IN AMPERES
LLNRK LLSRK
14
LLNRK/LLSRK Series POWR-PRO®Class RK1
250/600 VA C ■Dual-Element, Time-Dela y ■1/10 – 600 Amperes
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 Peak Let-Thru Current**
Circuit for various fuse ratings
Current* 30A 60A 100A 200A 400A 600A
5,000 1,060 1,600 2,100 2,600 4,100 —
10,000 1,350 2,000 2,800 3,400 5,250 8,000
15,000 1,600 2,300 3.200 3,900 6,000 9,000
20,000 1,700 2,600 3,600 4,500 6,700 10,000
25,000 1,900 2,800 3,800 4,800 7,500 11,000
30,000 2,000 3,000 4,100 5,200 8,000 12,000
35,000 2,100 3,100 4,400 5,700 8,500 12,500
40,000 2,200 3,300 4,600 6,000 9,000 13,000
50,000 2,400 3,500 4,900 6,500 9,500 14,000
60,000 2,500 3,800 5,200 7,000 10,000 15,000
80,000 2,700 4,000 5,700 7,750 11,000 17,000
100,000 2,900 4,200 6,200 8,500 12,000 18,000
150,000 3,200 4,600 7,300 10,000 14,000 21,000
200,000 3,300 4,700 8,000 11,000 16,000 23,000
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
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
600A
400A
200A
100A
60A
30A
PEAK LET-THRU IN AMPERES
AVAILABLE FAULT CURRENT
SYMMETRICAL R. M. S. 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
Short Peak Let-Thru Current**
Circuit for various fuse ratings
Current* 30A 60A 100A 200A 400A 600A
5,000 900 1,400 2,000 2,700 4,800 5,000
10,000 1,100 1,900 2,700 3,500 6,200 8,500
15,000 1,250 2,100 3,100 4,200 7,000 9,500
20,000 1,400 2,400 3,500 4,600 8,000 10,800
25,000 1,500 2,600 3,900 5,000 8,300 11,500
30,000 1,600 2,800 4,000 5,250 9,000 12,000
35,000 1,700 2,850 4,300 5,500 9,500 12,500
40,000 1,800 3,000 4,600 5,800 9,800 13,500
50,000 1,900 3,200 4,800 6,300 10,200 14,000
60,000 2,000 3,500 5,200 6,700 11,000 15,000
80,000 2,200 3,900 5,700 7,200 12,200 16,000
100,000 2,300 4,000 6,000 8,100 12,700 17,000
150,000 2,500 4,500 6,700 9,100 14,000 19,000
200,000 2,600 4,800 7,000 9,700 15,000 20,000
LLNRK LLSRK
