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80
Semiconductor Fuses
150/250/500/600/700 VAC
s
Very Fast-Acting
s
1 1000 Amperes
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."
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.
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.
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.)
s
Extremely Current Limiting -- Low I
2
t and peak let-through
currents meet most semiconductor requirements.
s
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.
LONGER EQUIPMENT LIFE
s
Low Watt Losses -- Means less heating and power
consumption in circuit.
s
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.
81
KLC series fuses are recommended for replacement use only.
Semiconductor Fuses
150/250/500/600/700 VAC
s
Very Fast-Acting
s
1 1000 Amperes
Series & Voltage
L15S
L25S
L50S
L60S
KLC
L70S
150V AC
250V AC
150V DC (1 60A)
250V DC (1 200A)
500V AC
600V AC
600V AC
700V AC
100V DC (70 1000A) 200V DC (225 800A)
450V DC
650V DC
1
L15S 1
L25S 1
L60S 1
KLC 1
2
L15S 2
L25S 2
L60S 2
KLC 2
3
L15S 3
L25S 3
L60S 3
KLC 3
4
L15S 4
L25S 4
L60S 4
KLC 4
5
L15S 5
L25S 5
L60S 5
KLC 5
6
L15S 6
L25S 6
L60S 6
KLC 6
7
L15S 7
KLC 7
8
L15S 8
L25S 8
L60S 8
KLC 8
9
L15S 9
10
L15S 10
L25S 10
L50S 10
L60S 10
KLC 10
L70S 10
12
L15S 12
L25S 12
L50S 12
L60S 12
KLC 12
15
L15S 15
L25S 15
L50S 15
L60S 15
KLC 15
L70S 15
17
1
/
2
L60S 17
1
/
2
KLC 17
1
/
2
20
L15S 20
L25S 20
L50S 20
L60S 20
KLC 20
L70S 20
25
L15S 25
L25S 25
L50S 25
L60S 25
KLC 25
L70S 25
30
L15S 30
L25S 30
L50S 30
L60S 30
KLC 30
L70S 30
35
L15S 35
L25S 35
L50S 35
L60S 35
KLC 35
L70S 35
40
L15S 40
L25S 40
L50S 40
L60S 40
KLC 40
L70S 40
45
L15S 45
L25S 45
L60S 45
KLC 45
50
L15S 50
L25S 50
L50S 50
L60S 50
KLC 50
L70S 50
60
L15S 60
L25S 60
L50S 60
L60S 60
KLC 60
L70S 60
70
L15S 70
L25S 70
L50S 70
L60S 70
KLC 70
L70S 70
80
L15S 80
L25S 80
L50S 80
L60S 80
KLC 80
L70S 80
90
L15S 90
L25S 90
L50S 90
L60S 90
KLC 90
L70S 90
100
L15S 100
L25S 100
L50S 100
L60S 100
KLC 100
L70S 100
110
KLC 110
125
L15S 125
L25S 125
L50S 125
L60S 125
KLC 125
L70S 125
150
L15S 150
L25S 150
L50S 150
L60S 150
KLC 150
L70S 150
175
L25S 175
L50S 175
L60S 175
KLC 175
L70S 175
200
L15S 200
L25S 200
L50S 200
L60S 200
KLC 200
L70S 200
225
L25S 225
L50S 225
L60S 225
KLC 225
L70S 225
250
L15S 250
L25S 250
L50S 250
L60S 250
KLC 250
L70S 250
275
L25S 275
L50S 275
300
L15S 300
L25S 300
L50S 300
L60S 300
KLC 300
L70S 300
350
L15S 350
L25S 350
L50S 350
L60S 350
KLC 350
L70S 350
400
L15S 400
L25S 400
L50S 400
L60S 400
KLC 400
L70S 400
450
L15S 450
L25S 450
L50S 450
L60S 450
KLC 450
L70S 450
500
L15S 500
L25S 500
L50S 500
L60S 500
KLC 500
L70S 500
550
L50S 550
600
L15S 600
L25S 600
L50S 600
L60S 600
KLC 600
L70S 600
700
L25S 700
L50S 700
L60S 700
KLC 700
L70S 700
800
L15S 800
L25S 800
L50S 800
L60S 800
KLC 800
L70S 800
900
1000
L15S 1000
Ampere
Ratings
RATING TABLE
82
Semiconductor Fuses
150/250/500/600/700 VAC
s
Very Fast-Acting
s
1 1000 Amperes
AMPERE
RATING
DIMENSIONS IN INCHES (mm in parentheses)
FIG.
NO.
A
B
C
D
E
F
G
H
1 30
1
1-1/2
--
3/8
13/32
--
--
--
--
(38.1)
(9.5)
(10.3)
31 60
1
2
--
5/8
13/16
--
--
--
--
(50.8)
(15.9)
(20.6)
61 450
3
1-5/32
1-7/8
2-3/16
2-21/32
1
43/64
5/16
3/16
(29.4)
(47.6)
(55.6)
(67.5)
(25.4)
(17.1)
(7.9)
(4.8)
451 1000
3
1-1/4
1-15/16
2-9/16
3-1/2
1-1/2
1
13/32
1/4
(31.8)
(49.2)
(65.1)
(88.9)
(38.1)
(25.4)
(10.3)
(6.4)
L15S SERIES, 150* VOLTS AC
(Replaces KLA, KLW, L13S)
AMPERE
RATING
DIMENSIONS IN INCHES (mm in parentheses)
FIG.
NO.
A
B
C
D
E
F
G
H
1 30
1
2
--
1/2
9/16
--
--
--
--
(50.8)
(12.7)
(14.3)
31 60
2
1-5/8
2-1/4
2-1/2
3-3/16
13/16
23/32
11/32
1/8
(41.3)
(57.2)
(63.5)
(81.0)
(20.6)
(18.3)
(8.7)
(3.2)
61 200
3
1-5/8
2-5/16
2-7/16
3-1/8
1-7/32
1
5/16
3/16
(41.3)
(58.7)
(61.9)
(79.4)
(31.0)
(25.4)
(7.9)
(4.8)
201 700
3
1-19/32
2-9/32
2-29/32 3-27/32
1-1/2
1
13/32
1/4
(40.5)
(57.9)
(73.8)
(97.6)
(38.1)
(25.4)
(10.3)
(6.4)
701 800
3
1-19/32
2-9/32
2-29/32 3-27/32
2
1-1/2
13/32
1/4
(40.5)
(57.9)
(73.8)
(97.6)
(50.8)
(38.1)
(10.3)
(6.4)
L25S SERIES, 250 VOLTS AC
(Replaces KLB)
AMPERE
RATING
DIMENSIONS IN INCHES (mm in parentheses)
FIG.
NO.
A
B
C
D
E
F
G
H
10 30
1
2
--
1/2
9/16
--
--
--
--
(50.8)
(12.7)
(14.3)
31 60
2
1-5/8
2-1/4
2-1/2
3-3/16
13/16
23/32
11/32
1/8
(41.3)
(57.2)
(63.5)
(81.0)
(20.6)
(18.3)
(8.7)
(3.2)
61 100
3
2-1/8
2-11/16
3-1/32
3-5/8
1
3/4
11/32
1/8
(54.0)
(68.3)
(77.0)
(92.1)
(25.4)
(19.1)
(8.7)
(3.2)
101 200
3
2-1/8
2-13/16 2-15/16
3-5/8
1-7/32
1
5/16
3/16
(54.0)
(71.4)
(74.6)
(92.1)
(31.0)
(25.4)
(7.9)
(4.8)
201 400
3
2-3/32
2-25/32 3-13/32 4-11/32
1-1/2
1
13/32
1/4
(53.2)
(70.6)
(86.5)
(110.3)
(38.1)
(25.4)
(10.3)
(6.4)
401 600
3
2-7/32
2-29/32 3-17/32 4-15/32
2
1-1/2
13/32
1/4
(56.4)
(73.8)
(89.7)
(113.5)
(50.8)
(38.1)
(10.3)
(6.4)
601 800
3
2-7/32
4-9/32
4-5/8
6-15/32
2-1/2
2
17/32
3/8
(56.4)
(108.7)
(117.5)
(164.3)
(63.5)
(50.8)
(13.5)
(9.5)
L50S SERIES, 500 VOLTS AC / 450 VOLTS DC
(Replaces KLH)
E
H
F
G
A
B
C
D
Fig, 2
A
C
D
Fig. 1
83
F
G
A
B
C
E
J
H
Fig. 4
Semiconductor Fuses
150/250/500/600/700 VAC
s
Very Fast-Acting
s
1 1000 Amperes
A
B
C
D
E
F
G
H
J
10 30
1
2
--
1/2
9/16
--
--
--
--
--
(50.8)
(12.7)
(14.3)
31 60
3
2-7/8
3-7/16 3-25/32
4-3/8
1
43/64
11/32
1/8
--
(73.0)
(87.3)
(96.0) (111.1) (25.4)
(17.1)
(8.7)
(3.2)
61 100
3
2-7/8
3-9/16 3-11/16
4-3/8
1-7/32
29/32
5/16
3/16
--
(73.0)
(90.5)
(93.7) (111.1) (31.0)
(22.9)
(7.9)
(4.8)
101 200
3
2-27/32 3-17/32 4-5/32
5-3/32
1-1/2
1
13/32
1/4
--
(72.2)
(89.7) (105.6) (129.4) (38.1)
(25.4)
(10.3)
(6.4)
201 400
3
2-27/32 3-17/32 4-5/32
5-3/32
2
1-1/2
13/32
1/4
--
(72.2)
(89.7) (105.6) (129.4)
(50.8)
(38.1)
(10.3)
(6.4)
401 600
3
2-27/32 4-29/32
5-1/4
7-3/32
2-1/2
2
17/32
3/8
--
(72.2) (124.6) (133.4) (180.2) (63.5)
(50.8)
(13.5)
(9.5)
601 800
4
3-5/16
5-5/16 6-13/16
--
2-7/8
2
5/8
3/8
5/16
(84.1) (134.9) (173.0)
(73.0)
(50.8)
(15.9)
(9.5)
(7.9)
AMPERE
RATING
DIMENSIONS IN INCHES (mm in parentheses)
FIG.
NO.
L70S SERIES, 700 VOLTS AC / 650 VOLTS DC
A
B
C
D
E
F
G
H
1 30
2
1-7/8
2-1/2
--
2-7/8
9/16
13/32
1/4
3/64
(47.6)
(63.5)
(73.0)
(14.3)
(10.3)
(6.4)
(1.2)
31 60
2
2-3/4
3-3/8
3-5/8
4-5/16
13/16
23/32
11/32
1/8
(69.9)
(85.7)
(92.1)
(109.5)
(20.6)
(18.3)
(8.7)
(3.2)
61 100
3
2-7/8
3-21/32
4-1/16
5
1
3/4
13/32
1/8
(73.0)
(92.9)
(103.2)
(127.0)
(25.4)
(19.1)
(10.3)
(3.2)
101 200
3
2-27/32 3-17/32
4-3/8
5-3/32
1-1/2
1
13/32
1/4
(72.2)
(89.7)
(111.1)
(129.4)
(38.1)
(25.4)
(10.3)
(6.4)
201 400
3
2-27/32 4-21/32 4-27/32
6-1/4
2
1-5/8
9/16
1/4
(72.2)
(118.3)
(123.0)
(158.8)
(50.8)
(41.3)
(14.3)
(6.4)
401 800
3
2-27/32 4-21/32 5-11/32
6-1/4
2-1/2
2
9/16
3/8
(72.2)
(118.3)
(135.7)
(158.8)
(63.5)
(50.8)
(14.3)
(9.5)
AMPERE
RATING
DIMENSIONS IN INCHES (mm in parentheses)
FIG.
NO.
KLC SERIES, 600 VOLTS AC
A
B
C
D
E
F
G
H
1 30
1
5
--
5/8
13/16
--
--
--
--
(127.0)
(15.9)
(20.6)
31 60
2
2-25/32
3-7/16
3-11/16
4-3/8
13/16
23/32
11/32
1/8
(70.6)
(87.3)
(93.7)
(111.1)
(20.6)
(18.3)
(8.7)
(3.2)
61 100
2
2-29/32 3-17/32 3-25/32 4-15/32
1-1/16
23/32
11/32
1/8
(73.8)
(89.7)
(96.0)
(113.5)
(27.0)
(18.3)
(8.7)
(3.2)
101 200
2
2-29/32
3-9/16
3-3/4
4-13/32
1-5/16
1
5/16
3/16
(73.8)
(90.5)
(95.3)
(111.9)
(33.3)
(25.4)
(7.9)
(4.8)
201 400
2
2-29/32 3-31/32
4-5/32
5-1/8
1-37/64
1
13/32
1/4
(73.8)
(100.8)
(105.6)
(130.2)
(40.1)
(25.4)
(10.3)
(6.4)
401 600
2
2-7/8
3-31/32
4-9/64
5-1/8
2-1/16
1-1/2
13/32
1/4
(73.0)
(100.8)
(105.2)
(130.2)
(52.8)
(38.1)
(10.3)
(6.4)
601 800
2
3-1/32
5-5/32
5-11/32
7-1/4
2-1/2
2
17/32
3/8
(77.0)
(133.4)
(135.7)
(184.2)
(63.5)
(50.8)
(13.5)
(9.5)
AMPERE
RATING
DIMENSIONS IN INCHES (mm in parentheses)
FIG.
NO.
L60S SERIES, 600 VOLTS AC
A
B
C
D
F
G
E
H
Fig. 3