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JLS Class J Fuses
600 VAC • Fast Acting • 1 – 600 Amperes
Space Saving
JLS fuse characteristics are similar to KLNR/KLSR fast acting Class
RK1 fuses, but dimensionally are much smaller.
Safety
• 200,000 A.I.R. — Reliable interruption of all overcurrents up to
200,000 amperes.
• Extremely current-limiting — Stops damaging short-circuit current
faster than any mechanical protective device.
• Fast acting — Provides fast acting protection to equipment such as
variable speed drives, rectifiers and other equipment containing surge
sensitive components.
Longer Equipment Life
• Current-limiting design reduces damage to equipment caused by
heating and magnetic effects of short-circuit currents.
Economical
Extremely current-limiting design often permits use of readily
available, less costly equipment.
Manufacturers of equipment containing dual voltage devices can
simplify manufacturing and reduce inventory by standardizing on 600
volt JLS fuses and Class J fuse blocks for all AC voltage ratings.
JLS series fuses provide space saving, fast acting overload and short-
circuit protection for non-inductive loads. When used for motors or other
inductive loads, the ampere rating of JLS series fuses must be increased
to prevent nuisance opening on in-rush currents. In such applications, JLS
fuses may provide only short-circuit protection. Consider using Littelfuse
POWR-PRO ® JTD or JTD_ID series time-delay fuses in such circuits.
Easy to use
200,000 A.I.R. rating minimizes need for short-circuit calculations.
NOTE: Littelfuse JLS fuses are not time-delay fuses. For applications
where short-duration surges and spikes may cause nuisance fuse
opening, consider the use of Littelfuse POWR-PRO JTD or JTD_ID
series time-delay fuses.
Applications
General purpose circuits with little or no motor load.
Resistive loads, such as resistance electric heat.
Loads requiring fast acting overload protection, such as equipment
containing solid-state devices.
Specifications
Ampere Ratings
Voltage Ratings:
600 Volts AC
1
25
60
125
300
Interrupting Ratings:
200,000 a­peres r­s sy­­etrical
3
30
70
150
350
Ampere Range:
1 – 600 a­peres
6
35
80
175
400
Approvals:
Standard 248-8, Class J
10
40
90
200
450
UL Listed (File No: E81895)
15
45
100
225
500
CSA Certified (File No: LR29862)
20
50
110
250
600
QPL: Federal Specification No: WF-1814
Exa­ple part nu­ber (series & a­perage): JLS 110
Recommended Fuse Blocks
LPSJ series, LJ600 series
Refer to the Blocks and Holders section of this catalog for additional infor­ation.
General Purpose Fuses
JLS Class J Fuses
600 VAC • Fast Acting • 1 — 600 Amperes
C
D
G
F
A
B
C
D
H
A
E
Fig. 1
Fig. 2
Refer to
Fig. No.
Dimensions In Inches (mm in parentheses)
Amperes
A
B
C
D
E
F
G
H
1 – 30
1
2 1 4 (57.2)
1 2 (12.7)
13 16 (20.6)
35 – 60
1
2 3 8 (60.3)
5 8 (15.9)
1 1 16 (27.0)
70 – 100
2
2 5 8 (66.7)
3 17 32 (89.7)
3 23 32 (94.5)
4 5 8 (117.5)
1 (25.4)
3 4 (19.1)
9 32 (7.1)
1 8 (3.2)
110 – 200
2
3 (76.2)
4 9 32 (108.7)
4 15 32 (113.5)
5 3 4 (146.1)
1 1 2 (38.1)
1 1 8 (28.6)
9 32 (7.1)
3 16 (4.8)
225 – 400
2
3 3 8 (85.7)
5 1 8 (130.2)
5 3 8 (136.5)
7 1 8 (181.0)
2 (50.8)
1 5 8 (41.3)
13 32 (10.3)
1 4 (6.4)
450 – 600
2
3 3 4 (95.3)
5 27 32 (148.4)
6 5 32 (156.4)
8 (203.2)
2 1 2 (63.5)
2 (50.8)
17 32 (13.5)
3 8 (9.5)
1000
800
600
400
300
200
1000000
800000
600000
400000
300000
200000
100
80
60
40
30
20
100000
80000
60000
40000
600A
400A
200A
100A
60A
30000
10
8
6
4
3
2
20000
10000
8000
6000
30A
4000
1
.8
.6
.4
.3
.2
3000
2000
1000
800
600
.1
.08
.06
.04
.03
.02
400
300
200
100
.01
CURRENT IN AMPERES
AVAILABLE FAULT CURRENT
SYMMETRICAL R. M. S. AMPERES