Littelfuse LLNRK_ID Series, LLSRK_ID Series Catalog Page
POWR-GARD® Fuse Datasheet
QPL
UL Class RK1
LLNRK/LLSRK/LLSRK_ID SERIES INDICATOR® POWR-PRO® FUSES
250/600VAC•DualElement•Time-Delay•1/10-600Amperes
Specifications
Voltage Ratings: 600 VAC/300 VDC (LLSRK/LLSRK_ID)
250 VAC/125 VDC (LLNRK)
Interrupting Ratings: AC: 200 k A rms symmetrical
300 kA rms symmetrical
(Littelfuse self-certified)
DC: 20 k A
Ampere Range: 1/10 – 600 A
Approvals: AC: Standard 248-12, Class RK1
UL Listed (File No. E81895)
CSA Certified (File No. LR29862)
DC: Littelfuse self-certified
Federal Specification WF-1814
(QPL- W -F-18 14)
Description
RK1 fuses are extremely current-limiting fuses meaning they
greatly reduce or eliminate damage to circuits and equipment under
short-circuit conditions. Replacing existing Class H, K and RK5 fuses
with RK1 fuses is one of the easiest ways to immediately improve
the protection of plant workers and equipment.
Applications
• All general purpose circuits
• Motors
• Transformers
• Safety upgrades
Features/Benefits
• POWR-PRO Performance (see pg. 3)
• Indication
• Dual-element design
• Extremely Current-Limiting
• IEC Type 2 “No Damage” protection to IEC and NEMA
type motor starters
• Indicating and DIN mount fuseholders available
Recommended Fuseholders
LFR60 Series
LFR25 Series
Ordering Information
1
10
/
15
100
/
2
10
/
1
4
/
3
10
/
4
10
/
1
2
/
6
10
/
8
10
/
Note: All LLSRK _ID fuses rate d 1 amp and above are Indicator® fuses.
*75 A is only available for the 600 V.
1 2 8/
8
1 1/
4
1 1/
10
1 4/
10
1 6/
10
1 8/
2 5 15 60 175 600
4
2 1/
2
2 1/
600 V
TYPE SERIES AMPER AGE
INDICATING LLSRK_ID 60 LLSRK060ID LSRK060.TXID
NON-INDICATING LLSRK 60 LLSRK060 LS RK0 60.T
250 V
TYPE SERIES AMPER AGE
NON-INDICATING LLNRK 80 LLNRK080 LNRK080.V
AMPER E RATINGS
10
6 1/
4
25 80 250
3 7 30 90 300
10
3 2/
3 1/
8 35 10 0 350
2
9 40 110 400
4 10 45 125 450
2
4 1/
5 6/
12 50 150 500
10
17 1/
2
70 200
6 20 75* 225
CATALOG
NUMBER
CATALOG
NUMBER
SYSTEM
NUMBER
SYSTEM
NUMBER
Web Resources
TC Curves, downloadable CAD drawings and other technical
information: www.littelfuse.com/llsrk
www.littelfuse.com/llnrk
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©June 2011 Littelfusewww.littelfuse.com
POWR-GARD® Fuse Datasheet
UL Class RK1
CLASS RK1 CURRENT LIMITING EFFECTS
Current-Limiting Effects of LLSRK and LLSRK_ID (600 V) Fuses
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
30 A 60 A 100 A 20 0 A 40 0 A 600 A
1,0 60 1,600 2 ,10 0 2,600 4,10 0 --
1,3 50 2,000 2,800 3,400 5,250 8,000
1,6 00 2,300 3,200 3,900 6,000 9,000
1,700 2,600 3,600 4,500 6,700 10,000
1,900 2,800 3,800 4,800 7,500 11,000
2,000 3,000 4,100 5,200 8,000 12,000
2,100 3,10 0 4,400 5,700 8,500 12,500
2,200 3,300 4,600 6,000 9,000 13,000
2,400 3,500 4,900 6,500 9,500 14,000
2,500 3,800 5,200 7,000 10,000 15,000
2,700 4,000 5,700 7,75 0 11,000 17,000
2,900 4,200 6,200 8,500 12,000 18,000
3,200 4,600 7,300 10,000 14,000 21,000
3,300 4,700 8,000 11,000 16,000 23,000
APPA RENT RM S SYMME TRICA L CUR RENT FOR VARIOUS FUSE R ATINGS
Current-Limiting Effects of LLNRK (250 V) Fuses
Visit ww w.littelfuse.com/llsrk for 600 V Current-Limiting effects
SHORT CIRCUIT CURRENT*
30 A 60 A 100 A 2 00 A 4 00 A 600 A
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
*Prospective RMS Symmetrical Amperes Shor t-Cir cuit Cur rent Visit w ww.lit telfuse.com /llnrk for 250 V Current-Limiting effects
Note: Data derived f rom Peak Let-Thru Curves
900 1,400 2,000 2,700 4,800 5,000
1,100 1,900 2,700 3,500 6,200 8,500
1,2 50 2,100 3,10 0 4,200 7,000 9,500
1,4 00 2,400 3,500 4,600 8,000 10,80 0
1,500 2,600 3,900 5,000 8,300 11,500
1,6 00 2,800 4,000 5,250 9,000 12,000
1,700 2,850 4,300 5,500 9,500 12,500
1,8 00 3,000 4,600 5,800 9,800 13,500
1,900 3,200 4,800 6,300 10, 20 0 14,000
2,000 3,500 5,200 6,700 11,000 15,000
2,200 3,900 5,700 7,200 12,200 16,000
2,300 4,000 6,000 8,100 12,700 17,000
2,500 4,500 6,700 9,100 14,000 19,000
2,600 4,800 7,000 9,700 15,000 20,000
APPA RENT RM S SYMME TRICA L CUR RENT FOR VARIOUS FUSE R ATINGS
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©June 2011 Littelfusewww.littelfuse.com
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