POWR-PRO
®
Fuses
LLNRK/LLSRK Series POWR-PRO
®
Class RK1 Fuses
250/600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes
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.
POWR-PRO
®
Fuses
Applications
All general purpose circuits
Motors
Transformers
Solenoids
Fluorescent lighting
All system components with high in-rush currents
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 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.
Specifications
Voltage Ratings:
AC: 250 Volts (LLNRK)
600 Volts (LLSRK)
DC: 125 Volts (LLNRK)
300 Volts (LLSRK)
AC: 200,000 amperes rms symmetrical
300,000 amperes rms symmetrical
(Littelfuse self-certified)
DC: 20,000 amperes
1/10 – 600 amperes
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
⁄
10
1
2
8
⁄
10
6
1
⁄
4
25
80
1
⁄
100
1 ⁄
8
3
7
30
90
2
⁄
10
1
1
⁄
4
3
2
⁄
10
8
35
100
1
4
1
⁄
4
*
1 ⁄
10
3 ⁄
2
9
40
110
3
⁄
10
1
6
⁄
10
4
10
45
125
4
⁄
10
1
8
⁄
10
4
1
⁄
2
12
50
150
1
⁄
2
2
5
15
60
175
6
⁄
10
2
1
⁄
4
5
6
⁄
10
17
1
⁄
2
70
200
8
⁄
10
2
1
⁄
2
6
20
75*
225
* LLSRK Only.
Example part number (series & amperage): LLNRK 450.
For online ordering, use numbers LNRK and LSRK for LLNRK/LLSRK.
1
15
Interrupting Ratings:
250
300
350
400
450
500
600
Ampere Range:
Approvals:
Recommended Fuse Blocks
LR250 series (LLNRK Series)
LR600 series (LLSRK Series)
Refer to the Blocks & Holders section of this catalog for additional information.
www.littelfuse.com
© 2005 Littelfuse
•
POWR-GARD
™
Products Catalog
POWR-PRO
®
Fuses
LLNRK/LLSRK Series POWR-PRO
®
Class RK1 Fuses
250/600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes
Current-Limiting Effects of LLNRK (250V) fuses
POWR-PRO
®
Fuses
Short
Circuit
Current*
5,000
0,000
5,000
0,000
5,000
30,000
35,000
0,000
50,000
0,000
0,000
00,000
50,000
00,000
Apparent RMS Symmetrical for Various Fuse Ratings
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
0A
1,400
1,900
2,100
2,400
2,600
2,800
2,850
3,000
3,200
3,500
3,900
4,000
4,500
4,800
00A
2,000
2,700
3,100
3,500
3,900
4,000
4,300
4,600
4,800
5,200
5,700
6,000
6,700
7,000
00A
2,700
3,500
4,200
4,600
5,000
5,250
5,500
5,800
6,300
6,700
7,200
8,100
9,100
9,700
00A
4,800
6,200
7,000
8,000
8,300
9,000
9,500
9,800
10,200
11,000
12,200
12,700
14,000
15,000
00A
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
Current-Limiting Effects of LLSRK (600V) fuses
Short
Circuit
Current*
5,000
0,000
5,000
0,000
5,000
30,000
35,000
0,000
50,000
0,000
0,000
00,000
50,000
00,000
Apparent RMS Symmetrical for Various Fuse Ratings
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
0A
1,600
2,000
2,300
2,600
2,800
3,000
3,100
3,300
3,500
3,800
4,000
4,200
4,600
4,700
00A
2,100
2,800
3.200
3,600
3,800
4,100
4,400
4,600
4,900
5,200
5,700
6,200
7,300
8,000
00A
2,600
3,400
3,900
4,500
4,800
5,200
5,700
6,000
6,500
7,000
7,750
8,500
10,000
11,000
00A
4,100
5,250
6,000
6,700
7,500
8,000
8,500
9,000
9,500
10,000
11,000
12,000
14,000
16,000
00A
—
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
* Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data derived from Peak Let-Thru Curves
* Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data derived from Peak Let-Thru Curves
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
PEAK LET-THRU IN AMPERES
40000
30000
20000
10000
8000
6000
4000
3000
2000
1000
800
600
400
300
200
100
6000
8000
10000
20000
30000
40000
60000
80000
100000
100
200
300
400
600
800
1000
2000
3000
4000
200000
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
05568003
www.littelfuse.com
© 2005 Littelfuse
•
POWR-GARD
™
Products Catalog
05569003
PCB Design
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