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LLSRK_ID Series Indicator
600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes
Applications
All general purpose circuits
Motors
Transformers
Solenoids
Fluorescent lighting
All system components with high in-rush currents
Features/Benefits
The all new LLSRK_ID series fuse is the most advanced Class RK1
fuse available today providing unparalleled performance and protection
to modern circuits. The patented Indicator technology provides instant
identification of a blown fuse greatly enhancing system up-time, while
the precision formed short-circuit elements virtually eliminate damage
to components from unexpected electrical faults. In addition, the all new
solid-state overload section has no moving parts, stopping unnecessary
fatigue failures commonly found in other spring loaded fuses.
• Reduce downtime — The indicating window of the LLSRK_ID
immediately identifies the open fuse. If the indicating strip is black,
the fuse has opened. It’s that simple. Maintenance personnel can
immediately determine that there is an open fuse.
• Reduce fuse inventory — The superior performance of the LLSRK_ID
allows it to be used in a variety of applications, thus decreasing fuse
inventory.
• Reduce nuisance opening — Indicator fuses offer superior time-delay
and cycling characteristics, which can lengthen fuse life.
• Reduce equipment damage — Indicator fuses provide superior
overload and short-circuit protection that can reduce equipment
damage. The LLSRK_ID is extremely current-limiting and provides
IEC Type 2 “No Damage” protection to IEC and NEMA type motor
starters.
• Reduce accidents — The LLSRK_ID Indicator fuse improves safety
by minimizing exposure to live circuits. Unlike other forms of blown
fuse indication, once the indicating strip darkens, it stays dark. Other
forms of indication require the power to remain on, which causes a
potential safety hazard to personnel.
Ordering Information
For online ordering use part number LSRK.
Specifications
Ampere Ratings
Voltage Rating:
600 VAC/300 VDC
1 10
1
2 8 10
6 1 4
25
80
250
Interrupting Ratings:
AC: 200,000 amperes rms symmetrical
15 100
1 1 8
3
7
30
90
300
300,000 amperes rms symmetrical
2 10
1 1 4
3 2 10
8
35
100
350
(Littelfuse self-certified)
1 4
1 4 10
3 1 2
9
40
110
400
DC: 20,000 amperes
3 10
1 6 10
4
10
45
125
450
Ampere Range:
1/10 – 600 amperes
4 10
1 8 10
4 1 2
12
50
150
500
Approvals:
AC: Standard 248-12, Class RK1
1 2
2
5
15
60
175
600
UL Listed (File No: E81895)
6 10
2 1 4
5 6 10
17 1 2
70
200
CSA Certified (File No: LR29862)
8 10
2 1 2
6
20
75
225
DC: Littelfuse self-certified
Example part number (series & amperage): LLSRK30ID.
NOTE: All fuses rated 1 amp and above are Indicator fuses.
Recommended Fuse Blocks
LR600 Series
Refer to the Blocks & Holders section of this catalog for
additional information.
POWR-PRO ® Fuses
LLSRK_ID Series Indicator ® POWR-PRO ® Class RK1 Fuses
600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes
Plated End Caps
Blown Fuse Indicator Assembly
Precision Formed Short Circuit Element
Fiberglass Reinforced Pultruded Body
Granular Quartz Filling
Elastomeric Silicone Overload Section
1000
100
10
1
0.1
0.01
0.5
1
10
100
1000
2000
CURRENT IN AMPERES
CURRENT IN AMPERES
Contact Littelfuse for additional fuse curves.
POWR-PRO ® Fuses
LLSRK_ID Series Indicator ® POWR-PRO ® Class RK1 Fuses
600 VAC • Dual-Element, Time-Delay • 1/10 – 600 Amperes
Current-Limiting Effects of LLSRK_ID (600V) Fuses
Short Circuit Current*
Apparent RMS Symmetrical Current for Various Fuse Ratings
30A
0A
00A
00A
00A
00A
5,000
1,060
1,600
2,100
2,600
4,100
--
0,000
1,350
2,000
2,800
3,400
5,250
8,000
5,000
1,600
2,300
3,200
3,900
6,000
9,000
0,000
1,700
2,600
3,600
4,500
6,700
10,000
5,000
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
0,000
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
0,000
2,500
3,800
5,200
7,000
10,000
15,000
0,000
2,700
4,000
5,700
7,750
11,000
17,000
00,000
2,900
4,200
6,200
8,500
12,000
18,000
50,000
3,200
4,600
7,300
10,000
14,000
21,000
00,000
3,300
4,700
8,000
11,000
16,000
23,000
* Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data derived from Peak Let-Thru Curves
1000000
100000
10000
60A
30A
3.5A
1000
100
AVAILABLE FAULT CURRENT
AVAILABLE FAULT CURRENT
SYMMETRICAL R.M.S. AMPERES
SYMMETRICAL R.M.S. AMPERES
© 2005 Littelfuse • POWR-GARD ™ Products Catalog
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