Semiconductor Fuses
150/250/500/600/700 VAC
s
Very Fast-Acting
s
1 – 1000 Amperes
SPECIFICATIONS
Voltage Ratings:
L15S: 150 V AC/DC (1 – 60A)
150 VAC (70 – 1000A)
100 VDC (70 – 1000A)
L25S: 250 V AC/DC (1 – 200A)
250 VAC (225 – 800A)
200 VDC (225 – 800A)
L50S: 500 VAC/450VDC
L60S: 600 VAC
KLC: 600 VAC
L70S: 700VAC/650VDC
Interrupting Rating:
AC: 200,000 rms amperes
(L15S series 100,000 amperes)
DC: 20,000 amperes
Ampere Range:
1 – 1000 amperes
See Rating Table for ratings available
in each series.
Approvals:
UL Recognized under the Components Program
and CSA Recognized under the Component
Acceptance Program.
UL File No: E71611
CSA File No: LR29862
L15S and L25S series fuses are Littelfuse
Certified for DC ratings shown in Rating Table.
AMPERE RATINGS
See Rating Table.
RECOMMENDED FUSE BLOCKS
LSCR series:Refer to Fuse Block section of this catalog for
additional information.
Designed to protect today’s equipment and systems,
Littelfuse semiconductor fuses are manufactured with
Littelfuse-developed technology that sets tomorrow’s stan-
dards for accuracy, consistent quality, reliability, and predict-
able performance. By using advanced metallurgical, polymer,
and materials research; mathematical modeling, and comput-
erized statistical analysis; Littelfuse engineers have redefined
“State-of-the-Art.”
SAFETY
s
200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes . . . meets present and future system
requirements. (Note: L15S series has 100,000 A.I.R.)
Extremely Current Limiting — Low I
2
t and peak let-through
currents meet most semiconductor requirements.
UL Recognized — Littelfuse semiconductor fuses are
recognized under the components program of Underwriters
Laboratories, Inc., and carry the
mark. UL Recognized
semiconductor fuses may be used to provide supplemen-
tary protection in UL listed equipment.
s
s
APPLICATIONS
Designed specifically for supplementary protection of
semiconducting devices such as silicon controlled rectifiers
(SCR’s), diodes, thyristors, triacs, transistors, and similar
solid-state devices. These devices are used in power
equipment including variable speed drives, power rectifiers,
UPS systems, DC power supplies, and in a wide range of
electronic equipment.
May be used wherever extremely fast-acting, current-limiting
fuses with no time delay are required.
LONGER EQUIPMENT LIFE
s
Low Watt Losses — Means less heating and power
consumption in circuit.
Controlled Transient Overvoltages — All circuits are subject
to transient overvoltages during fault current interruption.
These transient overvoltages (arc voltages) start when fuse
links melt or circuit breaker contacts part, and subside
when circuit is interrupted. Semiconductors are very
sensitive to overvoltages. Littelfuse semiconductor fuse
designs keep transient overvoltages to low levels and help
reduce semiconductor failure.
s
80
Semiconductor Fuses
150/250/500/600/700 VAC
s
Very Fast-Acting
s
1 – 1000 Amperes
RATING TABLE
Series & Voltage
Ampere
Ratings
1
2
3
4
5
6
7
8
9
10
12
15
17
1
⁄
2
20
25
30
35
40
45
50
60
70
80
90
100
110
125
150
175
200
225
250
275
300
350
400
450
500
550
600
700
800
900
1000
L15S
L25S
L50S
500V AC
450V DC
L60S
600V AC
KLC‡
600V AC
L70S
700V AC
650V DC
150V AC
250V AC
150V DC (1 – 60A)
250V DC (1 – 200A)
100V DC (70 – 1000A) 200V DC (225 – 800A)
L15S 1
L15S 2
L15S 3
L15S 4
L15S 5
L15S 6
L15S 7
L15S 8
L15S 9
L15S 10
L15S 12
L15S 15
L15S 20
L15S 25
L15S 30
L15S 35
L15S 40
L15S 45
L15S 50
L15S 60
L15S 70
L15S 80
L15S 90
L15S 100
L15S 125
L15S 150
L15S 200
L15S 250
L15S 300
L15S 350
L15S 400
L15S 450
L15S 500
L15S 600
L15S 800
L15S 1000
L25S 1
L25S 2
L25S 3
L25S 4
L25S 5
L25S 6
L25S 8
L25S 10
L25S 12
L25S 15
L25S 20
L25S 25
L25S 30
L25S 35
L25S 40
L25S 45
L25S 50
L25S 60
L25S 70
L25S 80
L25S 90
L25S 100
L25S 125
L25S 150
L25S 175
L25S 200
L25S 225
L25S 250
L25S 275
L25S 300
L25S 350
L25S 400
L25S 450
L25S 500
L25S 600
L25S 700
L25S 800
L50S 10
L50S 12
L50S 15
L50S 20
L50S 25
L50S 30
L50S 35
L50S 40
L50S 50
L50S 60
L50S 70
L50S 80
L50S 90
L50S 100
L50S 125
L50S 150
L50S 175
L50S 200
L50S 225
L50S 250
L50S 275
L50S 300
L50S 350
L50S 400
L50S 450
L50S 500
L50S 550
L50S 600
L50S 700
L50S 800
L60S 1
L60S 2
L60S 3
L60S 4
L60S 5
L60S 6
L60S 8
L60S 10
L60S 12
L60S 15
L60S 17
1
⁄
2
L60S 20
L60S 25
L60S 30
L60S 35
L60S 40
L60S 45
L60S 50
L60S 60
L60S 70
L60S 80
L60S 90
L60S 100
L60S 125
L60S 150
L60S 175
L60S 200
L60S 225
L60S 250
L60S 300
L60S 350
L60S 400
L60S 450
L60S 500
L60S 600
L60S 700
L60S 800
KLC 1
KLC 2
KLC 3
KLC 4
KLC 5
KLC 6
KLC 7
KLC 8
KLC 10
KLC 12
KLC 15
KLC 17
1
⁄
2
KLC 20
KLC 25
KLC 30
KLC 35
KLC 40
KLC 45
KLC 50
KLC 60
KLC 70
KLC 80
KLC 90
KLC 100
KLC 110
KLC 125
KLC 150
KLC 175
KLC 200
KLC 225
KLC 250
KLC 300
KLC 350
KLC 400
KLC 450
KLC 500
KLC 600
KLC 700
KLC 800
L70S 10
L70S 15
L70S 20
L70S 25
L70S 30
L70S 35
L70S 40
L70S 50
L70S 60
L70S 70
L70S 80
L70S 90
L70S 100
L70S 125
L70S 150
L70S 175
L70S 200
L70S 225
L70S 250
L70S 300
L70S 350
L70S 400
L70S 450
L70S 500
L70S 600
L70S 700
L70S 800
‡ KLC series fuses are recommended for replacement use only.
81
Semiconductor Fuses
150/250/500/600/700 VAC
s
Very Fast-Acting
s
1 – 1000 Amperes
L15S SERIES, 150* VOLTS AC
(Replaces KLA, KLW, L13S)
AMPERE
RATING
1 – 30
31 – 60
61 – 450
451 – 1000
FIG.
NO.
1
1
3
3
DIMENSIONS IN INCHES (mm in parentheses)
A
1-1/2
(38.1)
2
(50.8)
1-5/32
(29.4)
1-1/4
(31.8)
B
—
—
1-7/8
(47.6)
1-15/16
(49.2)
C
3/8
(9.5)
5/8
(15.9)
2-3/16
(55.6)
2-9/16
(65.1)
D
13/32
(10.3)
13/16
(20.6)
2-21/32
(67.5)
3-1/2
(88.9)
E
—
—
1
(25.4)
1-1/2
(38.1)
F
—
—
43/64
(17.1)
1
(25.4)
G
—
—
5/16
(7.9)
13/32
(10.3)
H
—
—
3/16
(4.8)
1/4
(6.4)
L25S SERIES, 250 VOLTS AC
(Replaces KLB)
AMPERE
RATING
1 – 30
31 – 60
61 – 200
201 – 700
701 – 800
FIG.
NO.
1
2
3
3
3
DIMENSIONS IN INCHES (mm in parentheses)
A
2
(50.8)
1-5/8
(41.3)
1-5/8
(41.3)
1-19/32
(40.5)
1-19/32
(40.5)
B
—
2-1/4
(57.2)
2-5/16
(58.7)
2-9/32
(57.9)
2-9/32
(57.9)
C
1/2
(12.7)
2-1/2
(63.5)
2-7/16
(61.9)
D
9/16
(14.3)
3-3/16
(81.0)
3-1/8
(79.4)
E
—
13/16
(20.6)
1-7/32
(31.0)
1-1/2
(38.1)
2
(50.8)
F
—
23/32
(18.3)
1
(25.4)
1
(25.4)
1-1/2
(38.1)
G
—
11/32
(8.7)
5/16
(7.9)
13/32
(10.3)
13/32
(10.3)
H
—
1/8
(3.2)
3/16
(4.8)
1/4
(6.4)
1/4
(6.4)
2-29/32 3-27/32
(73.8)
(97.6)
2-29/32 3-27/32
(73.8)
(97.6)
L50S SERIES, 500 VOLTS AC / 450 VOLTS DC
(Replaces KLH)
AMPERE
RATING
10 – 30
31 – 60
61 – 100
101 – 200
201 – 400
401 – 600
601 – 800
FIG.
NO.
1
2
3
3
3
3
3
DIMENSIONS IN INCHES (mm in parentheses)
A
2
(50.8)
1-5/8
(41.3)
2-1/8
(54.0)
2-1/8
(54.0)
2-3/32
(53.2)
2-7/32
(56.4)
2-7/32
(56.4)
B
—
2-1/4
(57.2)
2-11/16
(68.3)
C
1/2
(12.7)
2-1/2
(63.5)
3-1/32
(77.0)
D
9/16
(14.3)
3-3/16
(81.0)
3-5/8
(92.1)
3-5/8
(92.1)
E
—
13/16
(20.6)
1
(25.4)
1-7/32
(31.0)
1-1/2
(38.1)
2
(50.8)
2-1/2
(63.5)
F
—
23/32
(18.3)
3/4
(19.1)
1
(25.4)
1
(25.4)
1-1/2
(38.1)
2
(50.8)
G
—
11/32
(8.7)
11/32
(8.7)
5/16
(7.9)
13/32
(10.3)
13/32
(10.3)
17/32
(13.5)
H
—
1/8
(3.2)
1/8
(3.2)
3/16
(4.8)
1/4
(6.4)
1/4
(6.4)
3/8
(9.5)
2-13/16 2-15/16
(71.4)
(74.6)
2-25/32 3-13/32 4-11/32
(70.6)
(86.5) (110.3)
2-29/32 3-17/32 4-15/32
(73.8)
(89.7) (113.5)
4-9/32
(108.7)
4-5/8 6-15/32
(117.5) (164.3)
D
C
A
F
G
A
B
C
D
H
E
Fig. 1
Fig, 2
82
Semiconductor Fuses
150/250/500/600/700 VAC
s
Very Fast-Acting
s
1 – 1000 Amperes
L60S SERIES, 600 VOLTS AC
AMPERE
RATING
1 – 30
31 – 60
61 – 100
101 – 200
201 – 400
401 – 600
601 – 800
FIG.
NO.
1
2
2
2
2
2
2
DIMENSIONS IN INCHES (mm in parentheses)
A
5
(127.0)
2-25/32
(70.6)
B
—
3-7/16
(87.3)
C
5/8
(15.9)
D
13/16
(20.6)
E
—
13/16
(20.6)
1-1/16
(27.0)
1-5/16
(33.3)
1-37/64
(40.1)
2-1/16
(52.8)
2-1/2
(63.5)
F
—
23/32
(18.3)
23/32
(18.3)
1
(25.4)
1
(25.4)
1-1/2
(38.1)
2
(50.8)
G
—
11/32
(8.7)
11/32
(8.7)
5/16
(7.9)
13/32
(10.3)
13/32
(10.3)
17/32
(13.5)
H
—
1/8
(3.2)
1/8
(3.2)
3/16
(4.8)
1/4
(6.4)
1/4
(6.4)
3/8
(9.5)
3-11/16 4-3/8
(93.7) (111.1)
2-29/32 3-17/32 3-25/32 4-15/32
(73.8)
(89.7)
(96.0) (113.5)
2-29/32
(73.8)
3-9/16
(90.5)
3-3/4
(95.3)
4-5/32
(105.6)
4-9/64
(105.2)
5-11/32
(135.7)
4-13/32
(111.9)
5-1/8
(130.2)
5-1/8
(130.2)
7-1/4
(184.2)
2-29/32 3-31/32
(73.8) (100.8)
2-7/8
(73.0)
3-1/32
(77.0)
3-31/32
(100.8)
5-5/32
(133.4)
L70S SERIES, 700 VOLTS AC / 650 VOLTS DC
AMPERE
RATING
10 – 30
31 – 60
61 – 100
101 – 200
201 – 400
401 – 600
601 – 800
FIG.
NO.
1
3
3
3
3
3
4
DIMENSIONS IN INCHES (mm in parentheses)
A
2
(50.8)
2-7/8
(73.0)
2-7/8
(73.0)
B
—
C
1/2
(12.7)
D
9/16
(14.3)
E
—
F
—
43/64
(17.1)
29/32
(22.9)
1
(25.4)
1-1/2
(38.1)
2
(50.8)
2
(50.8)
G
—
11/32
(8.7)
5/16
(7.9)
13/32
(10.3)
13/32
(10.3)
17/32
(13.5)
5/8
(15.9)
H
—
1/8
(3.2)
3/16
(4.8)
1/4
(6.4)
1/4
(6.4)
3/8
(9.5)
3/8
(9.5)
J
—
—
—
—
—
—
5/16
(7.9)
3-7/16 3-25/32 4-3/8
1
(87.3) (96.0) (111.1) (25.4)
3-9/16 3-11/16 4-3/8 1-7/32
(90.5) (93.7) (111.1) (31.0)
2-27/32 3-17/32 4-5/32 5-3/32 1-1/2
(72.2) (89.7) (105.6) (129.4) (38.1)
2-27/32 3-17/32 4-5/32 5-3/32
(72.2) (89.7) (105.6) (129.4)
2
(50.8)
2-27/32 4-29/32 5-1/4 7-3/32 2-1/2
(72.2) (124.6) (133.4) (180.2) (63.5)
3-5/16 5-5/16 6-13/16
(84.1) (134.9) (173.0)
—
2-7/8
(73.0)
KLC SERIES, 600 VOLTS AC
AMPERE
RATING
1 – 30
31 – 60
61 – 100
101 – 200
201 – 400
401 – 800
FIG.
NO.
2
2
3
3
3
3
DIMENSIONS IN INCHES (mm in parentheses)
A
1-7/8
(47.6)
2-3/4
(69.9)
2-7/8
(73.0)
B
2-1/2
(63.5)
3-3/8
(85.7)
3-21/32
(92.9)
C
—
3-5/8
(92.1)
4-1/16
(103.2)
4-3/8
(111.1)
D
2-7/8
(73.0)
4-5/16
(109.5)
5
(127.0)
5-3/32
(129.4)
E
9/16
(14.3)
13/16
(20.6)
1
(25.4)
1-1/2
(38.1)
2
(50.8)
2-1/2
(63.5)
F
13/32
(10.3)
23/32
(18.3)
3/4
(19.1)
1
(25.4)
1-5/8
(41.3)
2
(50.8)
G
1/4
(6.4)
11/32
(8.7)
13/32
(10.3)
13/32
(10.3)
9/16
(14.3)
9/16
(14.3)
H
3/64
(1.2)
1/8
(3.2)
1/8
(3.2)
1/4
(6.4)
1/4
(6.4)
3/8
(9.5)
2-27/32 3-17/32
(72.2)
(89.7)
2-27/32 4-21/32 4-27/32 6-1/4
(72.2) (118.3) (123.0) (158.8)
2-27/32 4-21/32 5-11/32 6-1/4
(72.2) (118.3) (135.7) (158.8)
F
G
A
B
C
D
H
E
F
G
A
B
C
J
H
E
Fig. 3
Fig. 4
83
