LITTELFUSE LLSRK6, LLSRK56-10, LLSRK500, LLSRK50, LLSRK45 Datasheet
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12
LLNRK/LLSRK Series POWR-PRO®Class RK1
250/600 V A C■Dual-Element, Time-Delay■1/10 – 600 Amperes
SPECIFICATIONS
Voltage Ratings: AC: 250 V olts (LLNRK)
600 V olts (LLSRK)
DC: 125 Volts (LLNRK)
300 V olts (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:Feder al Specification No .WF-1814
DC: Littelfuse self-certified
AMPERE RATINGS
1
⁄
10
12
8
⁄
10 6
1
⁄
4 25 90 300
15
⁄
100
11⁄8 3 7 30 100 350
2
⁄
10
11⁄4 32⁄10 8 35 110 400
1
⁄
4
*
14⁄
10 3
1
⁄
2 9 40 125 450
3
⁄10 16⁄10 4 10 45 150 500
4
⁄10 18⁄10 41⁄2 12 50 175 600
1
⁄
2 251560200
6
⁄
10 2
1
⁄
4 5
6
⁄
10 17
1
⁄
2 70 225
8
⁄10 21⁄2 6 2080250
* 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.
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 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.
Littelfuse LLNRK and LLSRK series POWR-PRO
®
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.
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 V A C■Dual-Element, Time-Delay■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
E
C
D
G
B
A
J
K
H
B
C
F
DG
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
1020304060
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
1020304060
80
100
5
15A
30A
60A
100A
200A
400A
600A
TIME IN SECONDS
CURRENT IN AMPERES
LLNRK
LLSRK
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