JLS CLASS J FUSES
600 VAC
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Fast-Acting
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1 – 600 Amperes
SPECIFICATIONS
Voltage Ratings:
600 Volts AC
Interrupting Ratings:
200,000 amperes rms symmetrical
Ampere Range:
1 – 600 amperes
Approvals:
Standard 248-8, Class J
UL Listed (File No: E81895)
CSA Certified (File No: LR29862)
QPL: Federal Specification No: WF-1814
AMPERE RATINGS
1
3
6
10
15
20
25
30
35
40
45
50
60
70
80
90
100
110
125
150
175
200
225
250
300
350
400
450
500
600
Example part number (series & amperage): JLS 110
RECOMMENDED FUSE BLOCKS
LJ600 series
Refer to Fuse Block section of this catalog for additional
information.
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 inrush currents. In such applications, JLS fuses
may provide only short circuit protection. Consider using
Littelfuse POWR-PRO
®
JTD series time-delay fuses in
such circuits.
LONGER EQUIPMENT LIFE
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Current-limiting design reduces damage to equipment
caused by heating and magnetic effects of short-circuit
currents.
ECONOMICAL
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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.
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.
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EASY TO USE
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SPACE SAVING
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200,000 A.I.R. rating minimizes need for short-circuit
calculations.
JLS fuse characteristics are similar to KLNR/KLSR fast-
acting Class RK1 fuses, but they are much smaller.
SAFETY
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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 equip-
ment such as variable speed drives, rectifiers and other
equipment containing surge-sensitive components.
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 series time-delay fuses.
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37
JLS CLASS J FUSES
600 VAC
C
G
D
A
A
B
C
D
Fig. 2
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Fast-Acting
I
1 — 600 Amperes
F
H
E
Fig. 1
AMPERES
1 – 30
35 – 60
70 – 100
110 – 200
225 – 400
450 – 600
REFER TO
FIG. NO.
1
1
2
2
2
2
DIMENSIONS IN INCHES (mm in parentheses)
A
2-1/4
(57.2)
2-3/8
(60.3)
2-5/8
(66.7)
3
(76.2)
3-3/8
(85.7)
3-3/4
(95.3)
B
—
—
3-17/32
(89.7)
4-9/32
(108.7)
5-1/8
(130.2)
5-27/32
(148.4)
C
1/2
(12.7)
5/8
(15.9)
3-23/32
(94.5)
4-15/32
(113.5)
5-3/8
(136.5)
6-5/32
(156.4)
D
13/16
(20.6)
1-1/16
(27.0)
4-5/8
(117.5)
5-3/4
(146.1)
7-1/8
(181.0)
8
(203.2)
E
—
—
1
(25.4)
1-1/2
(38.1)
2
(50.8)
2-1/2
(63.5)
F
—
—
3/4
(19.1)
1-1/8
(28.6)
1-5/8
(41.3)
2
(50.8)
G
—
—
9/32
(7.1)
9/32
(7.1)
13/32
(10.3)
17/32
(13.5)
H
—
—
1/8
(3.2)
3/16
(4.8)
1/4
(6.4)
3/8
(9.5)
100A
200A
400A
1000
800
600
400
300
200
100
80
60
600A
30A
60A
1000000
800000
600000
400000
300000
200000
100000
80000
60000
PEAK LET-THRU IN AMPERES
40
30
20
10
8
6
4
3
2
1
.8
.6
.4
.3
.2
.1
.08
.06
.04
.03
.02
.01
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
600A
400A
200A
100A
60A
30A
TIME IN SECONDS
5
8
10
20
30
40
60
80
100
200
300
400
600
800
1000
2000
3000
4000
6000
8000
10000
20000
30000
40000
60000
80000
100000
CURRENT IN AMPERES
AVAILABLE FAULT CURRENT
SYMMETRICAL R. M. S. AMPERES
38
