General Purpose Fuses
FLNR_ID/FLSR_ID Indicator® Class RK5 Fuses
250/600 VAC • Dual-Element, Time Delay • 1/10 – 600 Amperes
Applications
General Purpose Fuses
Service entrance switches
Switchboard main and feeder switches
Motor control center mains and motor branch circuits
Individual fused combination motor controllers
Distribution panelboards
Industrial control panels
Protection of fully rated panelboards and loadcenters
All general purpose circuits
Features/Benefits
Littelfuse FLNR_ID/FLSR_ID Indicator fuses provide blown fuse
indication at a glance. The patented state-of-the-art solid state design
provides maximum reliability and superior performance characteristics
in a true dual-element design. The use of Indicator fuses reduces
downtime and nuisance openings, increases safety, and can save
thousands of dollars in lost production time.
• Reduce Downtime — A glance at the indicating window of a FLNR_ID
or FLSR_ID Indicator fuse pinpoints open fuses. If the indicating strip
is black, the fuse has opened. It’s that simple.
• Reduce Nuisance Opening — FLNR_ID and FLSR_ID Indicator
fuses have superior time-delay and cycling characteristics which can
lengthen fuse life and decrease needless opening.
• Reduce Fuse Inventory — Because FLNR_ID and FLSR_ID Indicator
fuses have superior performance characteristics, they can be used on a
variety of applications, thus decreasing fuse inventory.
• Reduce Equipment Damage — FLNR_ID and FLSR_ID Indicator
fuses have superior overload and short-circuit protection which can
reduce equipment damage.
• Reduce Accidents — The FLNR_ID and FLSR_ID Indicator fuses
improve safety by minimizing exposure to live circuits. Unlike other
forms of blown fuse indication, it doesn’t matter if the power is on
or off. No second guessing whether a light means a fuse is good or
bad, and no current going across a blown fuse to power a lighted
accessory.
Specifications
Ampere Ratings
Voltage Ratings:
AC: 250 Volts (FLNR_ID);
600 Volts (FLSR_ID)
DC: 125 Volts (FLNR 1⁄10 – 30A);
125 Volts (FLNR_ID 35 – 600A);
300 Volts (FLSR_ID)
Interrupting Ratings:
AC: 200,000 amperes rms symmetrical
300,000 amperes rms symmetrical
(Littelfuse self-certified)
DC: 20,000 amperes
1
Ampere Range:
⁄10 – 600 amperes
Approvals:
Standard 248-12, Class RK5
UL Listed (File No: E81895)
CSA Certified (File No: LR29862)
MSHA 300 Volt Listing (FLSR_ID)
QPL: Federal Specification WF-1814
6
⁄10**
⁄10
18 ⁄10
4
8
30
80
225
1
8
⁄8
⁄10
2
41⁄2
9
35
90
250
15
⁄100
1
2 1⁄4
5
10
40
100
300
2
⁄10
11⁄ 8
2 1⁄2
5 6 ⁄10
12
45
110
350
1
⁄4
11⁄4
2 8 ⁄10
6
15
50
125
400
3
⁄10
14 ⁄10
3
6 1⁄4
17 1⁄2
60
150
450
4
⁄10
11⁄ 2
3 2 ⁄10
7
20
70
175
500
1
⁄2
16 ⁄10
31⁄2
71⁄2
25
75*
200
600
*FLSR_ID only **FLNR only
Example part number (series & amperage): FLSR100ID
NOTE: For 1⁄10 – 30 ampere 250 volt fuses, order non-indicating FLNR series fuses.
NOTE: All FLNR_ID fuses rated 35 – 600A are Indicator fuses.
NOTE: All FLSR_ID fuses rated 1 amp and above are Indicator fuses.
1
Recommended Fuse Blocks
LR250 series (for FLNR_ID series fuses)
LR600 series (for FLSR_ID series fuses)
Refer to Blocks & Holders section of this catalog for additional information.
© 2005 Littelfuse • POWR-GARD™ Products Catalog
www.littelfuse.com
29
General Purpose Fuses
FLNR_ID/FLSR_ID Indicator® Class RK5 Fuses
250/600 VAC • Dual-Element, Time Delay • 1/10 – 600 Amperes
A
F
G
B
D
E
General Purpose Fuses
Refer To
Fig. No.
1
/10 – 30
1
35 – 60
1
70 – 100
2
110 – 200
2
225 – 400
2
450 – 600
2
F
D
J
G
70-600A
FIG. 2
Dimensions In Inches (mm in parentheses)
Series
FLNR
FLSR_ID
FLNR_ID
FLSR_ID
FLNR_ID
FLSR_ID
FLNR_ID
FLSR_ID
FLNR_ID
FLSR_ID
FLNR_ID
FLSR_ID
E
C
B
H
C
FIG. 1
Amperes
A
K
A
B
2 (50.8)
5 (127.0)
3 (76.2)
51⁄2 (139.7)
5 7⁄8 (149.2)
7 7⁄8 (200.0)
71⁄8 (181.0)
9 5 ⁄8 (244.5)
8 5 ⁄8 (219.1)
115 ⁄8 (295.3)
10 3 ⁄8 (263.5)
13 3 ⁄8 (339.7)
C
D
12
9 16
⁄ (12.7)
⁄ (12.7)
⁄ (14.3)
3 4
5 8
13 16
⁄ (19.1)
⁄ (15.9)
⁄ (20.6)
3 4
5 8
13 16
⁄ (19.1)
⁄ (15.9)
⁄ (20.6)
5 8
1 (25.4)
⁄ (15.9)
11 ⁄ 16 (27.0)
1 (25.4)
11 ⁄ 16 (27.0) 11 ⁄16 (27.0)
14
1 ⁄ (31.8) 11 ⁄ 16 (27.0) 15 ⁄16 (33.3)
11⁄2 (38.1) 115 ⁄32 (37.3) 119 ⁄32 (40.5)
13 ⁄4 (44.5) 115 ⁄32 (37.3) 127⁄32 (46.8)
2 (50.8) 115 ⁄16 (49.2) 2 3 ⁄32 (53.2)
21⁄2 (63.5)
2 (50.8)
2 19 ⁄32 (65.9)
12
3 8
2 ⁄ (63.5) 2 ⁄ (60.3) 219 ⁄32 (65.9)
3 (76.2) 2 13 ⁄ 32 (61.1) 3 3 ⁄32 (78.6)
12
E
F
G
H
J
K
⁄ (2.0)
3 32
⁄ (2.4)
3 32
⁄ (2.4)
3 32
⁄ (2.4)
18
⁄ (3.2)
18
⁄ (3.2)
3 16
⁄ (4.8)
3 16
⁄ (4.8)
14
⁄ (6.4)
14
⁄ (6.4)
14
⁄ (6.4)
14
⁄ (6.4)
⁄ (4.0)
3 16
⁄ (4.8)
3 16
⁄ (4.8)
14
⁄ (6.4)
3 4
⁄ (19.1)
3 4
⁄ (19.1)
11⁄8 (28.6)
11⁄8 (28.6)
15 ⁄8 (41.3)
15 ⁄ 8 (41.3)
2 (50.8)
2 (50.8)
⁄ (9.5)
5 8
⁄ (15.9)
5 8
⁄ (15.9)
78
⁄ (22.2)
11⁄4 (31.8)
11⁄2 (38.1)
127⁄ 32 (46.8)
23 ⁄32 (53.2)
211 ⁄32 (59.5)
227⁄32 (72.2)
227⁄ 32 (72.2)
311⁄32 (84.9)
—
—
—
—
14
⁄ (6.4)
14
⁄ (6.4)
7 16
⁄ (11.1)
7 16
⁄ (11.1)
5 8
⁄ (15.9)
5 8
⁄ (15.9)
3 4
⁄ (19.1)
3 4
⁄ (19.1)
—
—
—
—
9 32
⁄ (7.1)
9 32
⁄ (7.1)
9 32
⁄ (7.1)
9 32
⁄ (7.1)
13 32
⁄ (10.3)
13 32
⁄ (10.3)
17 32
⁄ (13.5)
17 32
⁄ (13.5)
—
—
—
—
12
⁄ (12.7)
12
⁄ (12.7)
11 16
⁄ (17.5)
11 16
⁄ (17.5)
15 16
⁄ (23.8)
15 16
⁄ (23.8)
11⁄8 (28.6)
11⁄8 (28.6)
5 64
5 32
3 8
FLSR_ID
1000
800
600
1000
800
600
400
300
200
400
300
200
100
80
60
100
80
60
40
30
20
40
30
10
8
6
TIME IN SECONDS
TIME IN SECONDS
20
4
3
2
1
.8
.6
10
8
6
4
3
2
.4
.3
1
.8
.6
.4
.3
.2
.2
.1
.08
.06
.1
.08
.06
.04
.03
.02
.04
.03
.02
300
400
200
60
80
100
30
40
20
6
8
10
2
3
4
.6
.8
1
.3
.4
.1
.2
600
800
1000
CURRENT IN AMPERES
10000
8000
6000
4000
3000
2000
1000
800
600
400
300
200
www.littelfuse.com
100
80
60
40
30
20
CURRENT IN AMPERES
10
8
6
4
3
2
1
.01
.01
30
10A
15A
20A
25A
30A
2/10A
1/4A
3/10A
4/10A
1/2A
6/10A
8/10A
1A
1 1/4A
1 4/10A
2A
2 1/2A
4 1/2A
5A
7A
7 1/2A
9A
FLNR
1A
1.25A
1.6A
2A
2.5A
3A
4A
6A
For additional application information request Product Bulletin EL-4
© 2005 Littelfuse • POWR-GARD™ Products Catalog
General Purpose Fuses
FLNR_ID/FLSR_ID Indicator® Class RK5 Fuses
250/600 VAC • Dual-Element, Time Delay • 1/10 – 600 Amperes
Current-Limiting Effects of FLNR_ID (250V) fuses
Short-Circuit Current*
Apparent RMS Symmetrical Current for Various Fuse Ratings
30A
60A
100A
200A
400A
600A
5,000
1,400
2,100
3,100
5,000
5,000
5,000
10,000
1,550
2,500
3,900
6,500
9,500
10,000
2,000
3,150
4,400
7,250
10,500
14,000
2,250
3,400
5,000
8,250
12,000
16,000
25,000
2,400
3,750
5,250
9,000
12,500
16,500
30,000
2,550
4,100
5,600
9,500
13,500
18,000
35,000
2,650
4,300
5,800
9,750
14,000
19,000
20,000
40,000
2,800
4,400
6,250
10,250
15,000
50,000
3,000
5,000
6,500
10,500
16,000
21,000
60,000
3,200
5,250
7,000
11,500
17,000
23,000
80,000
3,400
5,750
7,500
12,500
19,000
25,500
100,000
3,850
6,000
8,000
13,500
21,000
27,500
150,000
4,100
7,000
9,000
15,200
24,000
31,500
200,000
4,300
7,500
9,750
16,500
26,000
34,000
General Purpose Fuses
15,000
20,000
* Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data Derived from Peak Let-Thru Curves
Current-Limiting Effects of FLSR_ID (600V) fuses
Short-Circuit Current*
5,000
Apparent RMS Symmetrical Current for Various Fuse Ratings
30A
60A
100A
200A
400A
600A
1,250
2,100
3,200
5,000
5,000
5,000
10,000
1,600
2,850
4,300
7,250
10,000
10,000
15,000
1,800
3,400
5,000
8,500
13,500
15,000
19,000
20,000
2,250
3,800
5,500
9,500
15,750
25,000
2,450
4,100
5,700
10,250
17,000
21,000
30,000
2,700
4,500
6,400
10,750
18,000
23,000
35,000
2,900
4,800
6,700
11,500
19,000
24,250
40,000
3,000
5,000
7,250
12,000
19,500
27,000
50,000
3,400
5,250
7,750
13,000
21,000
29,000
60,000
3,600
5,750
8,100
14,000
22,000
30,500
80,000
3,900
6,250
9,000
15,000
24,000
33,000
100,000
4,300
6,750
9,750
16,500
26,000
35,000
150,000
4,500
7,600
11,100
19,000
28,000
38,000
200,000
4,600
8,400
12,250
21,500
30,000
40,000
* Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data Derived from Peak Let-Thru Curves
© 2005 Littelfuse • POWR-GARD™ Products Catalog
www.littelfuse.com
31
General Purpose Fuses
FLNR_ID/FLSR_ID Indicator® Class RK5 Fuses
250/600 VAC • Dual-Element, Time Delay • 1/10 – 600 Amperes
FLNR_ID
100A
FLSR_ID
400A 600A
200A
1000
800
600
600
400
400
300
300
200
200
100
80
100
80
60
60
40
40
30
30
20
20
TIME IN SECONDS
TIME IN SECONDS
General Purpose Fuses
60A
1000
800
10
8
6
4
3
2
1
.8
60A
100A
200A
400A 600A
10
8
6
4
3
2
1
.8
CURRENT IN AMPERES
100000
80000
60000
40000
30000
20000
10000
8000
6000
4000
3000
2000
1000
800
600
400
300
200
100
80
60
40
30
20
10
8
6
5
1000000
800000
600000
400000
300000
200000
100000
80000
60000
40000
30000
20000
.01
10000
8000
.02
.01
6000
.03
.02
4000
.03
3000
.06
.05
.04
2000
.04
1000
800
.1
.08
.06
600
.1
.08
400
.2
300
.3
.2
200
.4
.3
100
80
.6
.4
60
50
.6
CURRENT IN AMPERES
30A
15A
FLSR_ID
FLNR_ID
1000000
1000000
800000
800000
600000
600000
400000
400000
300000
300000
200000
200000
100000
80000
600A
60000
400A
200A
40000
30000
100A
20000
60A
10000
8000
6000
4000
3000
2000
PEAK LET - THRU IN AMPERES
PEAK LET - THRU IN AMPERES
600A
80000
100000
400A
60000
50000
200A
40000
30000
100A
20000
60A
10000
30A
8000
6000
5000
15A
4000
3000
2000
1000
1000
800
800
600
600
400
400
300
300
200
200
200000
100000
80000
60000
40000
30000
20000
10000
8000
6000
4000
3000
2000
1000
800
www.littelfuse.com
600
32
300
200000
100000
80000
60000
40000
30000
20000
10000
8000
6000
4000
3000
2000
1000
800
600
300
400
200
100
AVAILABLE FAULT CURRENT
SYMMETRICAL R.M.S. AMPERES
400
200
100
100
100
AVAILABLE FAULT CURRENT
SYMMETRICAL R. M. S. AMPERES
© 2005 Littelfuse • POWR-GARD™ Products Catalog