Special Purpose Fuses
Semiconductor Fuses
150 – 1300 VAC • Very Fast Acting • 1 – 6000 Amperes
Semiconductor Fuses
Littelfuse Semiconductor fuses are very fast acting fuses designed
specifically for the protection of diodes, thyristors, triacs, and other
solid-state power semiconductor devices. These fuses are used in
power electronic applications including variable speed drives, power
rectifiers, UPS systems, and DC power supplies. They can be used
wherever extremely fast acting, current-limiting fuses are needed to
provide superior protection against the potentially damaging effects of
short-circuit currents.
The extensive line of Littelfuse Semiconductor fuses includes the
traditional round body fuses, enhanced state-of-the-art round body
fuses, and North American style square body fuses. Available ratings
range from 150 to 1300 volts and up to 6000 amps.
Applications
Semiconductor fuses are 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.
Special Purpose Fuses
Features & Benefits
• Extremely current-limiting
• Low I
2
t and peak let-through currents
• Low watts loss
• High Interrupting ratings
• UL Recognized
• Wide range of ampere ratings
• Optional mounting types
• DC ratings
• Superior cycling abilities
• Compact sizes
• Optional blown fuse indicators
May be used wherever extremely fast acting, current-limiting fuses with
no time-delay are required.
Ratings
150V:
250V:
300V:
500V:
600V:
700V:
1000V:
1200V:
1300V:
1 – 6000A
1 – 4500A
35 – 4500A
10 – 1200A
1 – 2000A
6 – 2500A
15 – 1000A
1 – 30A
50 – 1800A
Recommended Fuse Blocks:
LSCR and 1LS series: Refer to the Blocks & Holders section of this catalog
for additional information.
84
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© 2005 Littelfuse
•
POWR-GARD
™
Products Catalog
Special Purpose Fuses
Traditional Semiconductor Fuses
150/250/500/600/700 VAC • Very Fast Acting • 1 – 1200 Amperes
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
1200
L15S
L25S*
150V AC
250V AC
150V DC (1 – 60A)
250V DC (1 – 200A)
100V DC (70 – 1000A) 200V DC (225 – 800A)
Specifications
KLC‡
600V AC
L50S
500V AC
450V DC
L60S
600V AC
L70S*
700V AC
650V DC
Voltage Ratings:
L15S:
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
LA50P9004
LA50P10004
LA50P12004
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
LA70P9004
LA70P10004
LA70P12004
L25S:
L50S:
L60S:
KLC:
L70S:
150 V AC/DC (1 – 60A)
150 VAC (70 – 1000A)
100 VDC (70 – 1000A)
250 V AC/DC (1 – 200A)
250 VAC (225 – 800A)
200 VDC (225 – 800A)
500 VAC/450 VDC
600 VAC
600 VAC
700VAC/650VDC
Interrupting Rating:
AC:
200,000 rms amperes
(L15S series 100,000A)
DC:
20,000 amperes
Ampere Range:
1 – 1200 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
L25S series fuses are Littelfuse Certified for
DC ratings shown in Rating Table.
*For availability of RoHS compliant
product, call 1-800-TEC-FUSE.
Special Purpose Fuses
‡ KLC series fuses are recommended for replacement use only.
© 2005 Littelfuse
•
POWR-GARD
™
Products Catalog
www.littelfuse.com
85
Special Purpose Fuses
Traditional Semiconductor Fuses
150/250/500/600/700 VAC • Very Fast Acting • 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
⁄
(9.5)
5 8
⁄
(15.9)
2
3
⁄
16
(55.6)
2
9
⁄
16
(65.1)
3 8
D
⁄
(10.3)
13 16
⁄
(20.6)
2
21
⁄
32
(67.5)
3
1
⁄
2
(88.9)
13 32
E
—
—
1
(25.4)
1
1
⁄
2
(38.1)
F
—
—
⁄
(17.1)
1
(25.4)
43 64
G
—
—
⁄
(7.9)
13 32
⁄
(10.3)
5 16
H
—
—
⁄
(4.8)
14
⁄
(6.4)
3 16
L25S SERIES, 250 VOLTS AC
(Replaces KLB)
Ampere
Rating
1 – 30
31 – 60
61 – 200
Special Purpose Fuses
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
⁄
(12.7)
2
1
⁄
2
(63.5)
2
7
⁄
16
(61.9)
2
29
⁄
32
(73.8)
2
29
⁄
32
(73.8)
12
D
⁄
(14.3)
3
3
⁄
16
(81.0)
3
1
⁄
8
(79.4)
3
27
⁄
32
(97.6)
3
27
⁄
32
(97.6)
9 16
E
—
⁄
(20.6)
1
7
⁄
32
(31.0)
1
1
⁄
2
(38.1)
2
(50.8)
13 16
F
—
⁄
(18.3)
1
(25.4)
1
(25.4)
1
1
⁄
2
(38.1)
23 32
G
—
⁄
(8.7)
5 16
⁄
(7.9)
13 32
⁄
(10.3)
13 32
⁄
(10.3)
11 32
H
—
⁄
(3.2)
3 16
⁄
(4.8)
14
⁄
(6.4)
14
⁄
(6.4)
18
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)
C
D
E
F
12
9 16
⁄
⁄
—
—
(12.7)
(14.3)
13 16
23 32
2
1
⁄
2
3
3
⁄
16
⁄
⁄
(63.5)
(81.0)
(20.6)
(18.3)
3 4
3
3
5
⁄
8
1
⁄
(76.2)
(92.1)
(25.4)
(19.1)
2
15
⁄
16
3
5
⁄
8
1
7
⁄
32
1
(74.6)
(92.1)
(31.0)
(25.4)
3
13
⁄
32
4
11
⁄
32
1
1
⁄
2
1
(86.5)
(110.3)
(38.1)
(25.4)
3
17
⁄
32
4
15
⁄
32
2
1
1
⁄
2
(89.7)
(113.5)
(50.8)
(38.1)
4
5
⁄
8
6
15
⁄
32
2
1
⁄
2
2
(117.5)
(164.3)
(63.5)
(50.8)
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)
2
13
⁄
16
(71.4)
2
25
⁄
32
(70.6)
2
29
⁄
32
(73.8)
4
9
⁄
32
(108.7)
G
—
⁄
(8.7)
11 32
⁄
(8.7)
5 16
⁄
(7.9)
13 32
⁄
(10.3)
13 32
⁄
(10.3)
17 32
⁄
(13.5)
11 32
H
—
⁄
(3.2)
18
⁄
(3.2)
3 16
⁄
(4.8)
14
⁄
(6.4)
14
⁄
(6.4)
3 8
⁄
(9.5)
18
D
F
G
A
B
C
D
E
H
Contact Littelfuse for characteristic curves.
C
A
Fig. 1
Fig, 2
86
www.littelfuse.com
© 2005 Littelfuse
•
POWR-GARD
™
Products Catalog
Special Purpose Fuses
Traditional Semiconductor Fuses
150/250/500/600/700 VAC • Very Fast Acting • 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)
C
D
E
F
5 8
13 16
⁄
⁄
—
—
(15.9)
(20.6)
13 16
23 32
3
11
⁄
16
4
3
⁄
8
⁄
⁄
(93.7)
(111.1)
(20.6)
(18.3)
23 32
3
25
⁄
32
4
15
⁄
32
1
1
⁄
16
⁄
(96.0)
(113.5)
(27.0)
(18.3)
3
3
⁄
4
4
13
⁄
32
1
5
⁄
16
1
(95.3)
(111.9)
(33.3)
(25.4)
4
5
⁄
32
5
1
⁄
8
1
37
⁄
64
1
(105.6)
(130.2)
(40.1)
(25.4)
4
9
⁄
64
5
1
⁄
8
2
1
⁄
16
1
1
⁄
2
(105.2)
(130.2)
(52.8)
(38.1)
5
11
⁄
32
7
1
⁄
4
2
1
⁄
2
2
(135.7)
(184.2)
(63.5)
(50.8)
A
5
(127.0)
2
25
⁄
32
(70.6)
2
29
⁄
32
(73.8)
2
29
⁄
32
(73.8)
2
29
⁄
32
(73.8)
2
7
⁄
8
(73.0)
3
1
⁄
32
(77.0)
B
—
3
7
⁄
16
(87.3)
3
17
⁄
32
(89.7)
3
9
⁄
16
(90.5)
3
31
⁄
32
(100.8)
3
31
⁄
32
(100.8)
5
5
⁄
32
(133.4)
G
—
⁄
(8.7)
11 32
⁄
(8.7)
5 16
⁄
(7.9)
13 32
⁄
(10.3)
13 32
⁄
(10.3)
17 32
⁄
(13.5)
11 32
H
—
⁄
(3.2)
18
⁄
(3.2)
3 16
⁄
(4.8)
14
⁄
(6.4)
14
⁄
(6.4)
3 8
⁄
(9.5
18
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)
C
D
E
F
G
12
9 16
⁄
⁄
—
—
—
(12.7)
(14.3)
43 64
11 32
3
25
⁄
32
4
3
⁄
8
1
⁄
⁄
(96.0)
(111.1)
(25.4)
(17.1)
(8.7)
29 32
5 16
3
11
⁄
16
4
3
⁄
8
1
7
⁄
32
⁄
⁄
(93.7)
(111.1)
(31.0)
(22.9)
(7.9)
13 32
4
5
⁄
32
5
3
⁄
32
1
1
⁄
2
1
⁄
(105.6)
(129.4)
(38.1)
(25.4)
(10.3)
13 32
4
5
⁄
32
5
3
⁄
32
2
1
1
⁄
2
⁄
(105.6)
(129.4)
(50.8)
(38.1)
(10.3)
17 32
5
1
⁄
4
7
3
⁄
32
2
1
⁄
2
2
⁄
(133.4)
(180.2)
(63.5)
(50.8)
(13.5)
5 8
6
13
⁄
16
2
7
⁄
8
2
⁄
—
(173.0)
(73.0)
(50.8)
(15.9)
A
2
(50.8)
2
7
⁄
8
(73.0)
2
7
⁄
8
(73.0)
2
27
⁄
32
(72.2)
2
27
⁄
32
(72.2)
2
27
⁄
32
(72.2)
3
5
⁄
16
(84.1)
B
—
3
7
⁄
16
(87.3)
3
9
⁄
16
(90.5)
3
17
⁄
32
(89.7)
3
17
⁄
32
(89.7)
4
29
⁄
32
(124.6)
5
5
⁄
16
(134.9)
H
—
⁄
(3.2)
3 16
⁄
(4.8)
14
⁄
(6.4)
14
⁄
(6.4)
3 8
⁄
(9.5)
3 8
⁄
(9.5)
18
J
—
—
Special Purpose Fuses
—
—
—
—
⁄
(7.9)
5 16
F
G
A
B
C
D
H
E
KLC SERIES, 600 VOLTS AC
Ampere
Rating
1 – 30
31 – 60
61 – 100
Fig.
No.
2
2
3
3
3
3
Dimensions in Inches (mm in parentheses)
C
D
E
F
78
9 16
13 32
2⁄
⁄
⁄
—
(73.0)
(14.3)
(10.3)
13 16
23 32
3
5
⁄
8
4
5
⁄
16
⁄
⁄
(92.1)
(109.5)
(20.6)
(18.3)
3 4
4
1
⁄
16
5
1
⁄
(103.2)
(127.0)
(25.4)
(19.1)
4
3
⁄
8
5
3
⁄
32
1
1
⁄
2
1
(111.1)
(129.4)
(38.1)
(25.4)
4
27
⁄
32
6
1
⁄
4
2
1
5
⁄
8
(123.0)
(158.8)
(50.8)
(41.3)
11 32
14
12
5 ⁄
6⁄
2⁄
2
(135.7)
(158.8)
(63.5)
(50.8)
Fig. 3
F
G
A
B
C
J
E
H
101 – 200
201 – 400
401 – 800
Fig. 4
A
1
7
⁄
8
(47.6)
2
3
⁄
4
(69.9)
2
7
⁄
8
(73.0)
2
27
⁄
32
(72.2)
2
27
⁄
32
(72.2)
2
27
⁄
32
(72.2)
B
2
1
⁄
2
(63.5)
3
3
⁄
8
(85.7)
3
21
⁄
32
(92.9)
3
17
⁄
32
(89.7)
4
21
⁄
32
(118.3)
4
21
⁄
32
(118.3)
G
⁄
(6.4)
11 32
⁄
(8.7)
13 32
⁄
(10.3)
13 32
⁄
(10.3)
9 16
⁄
(14.3)
9 16
⁄
(14.3)
14
H
⁄
(1.2)
18
⁄
(3.2)
18
⁄
(3.2)
14
⁄
(6.4)
14
⁄
(6.4)
3 8
⁄
(9.5)
3 64
Contact Littelfuse for characteristic curves.
© 2005 Littelfuse
•
POWR-GARD
™
Products Catalog
www.littelfuse.com
87
Special Purpose Fuses
LA15QS Semiconductor Fuses
150 VAC • Very Fast Acting • 1 – 6000 Amperes
Littelfuse LA15QS series Semiconductor fuses were designed for the
specific protection of diodes and other semiconductor devices rated
150VAC/DC. The LA15QS product line compact design is perfect for
those applications that have limitations on available space.
Features
• Low I
2
t minimizes damage to protected components on short-circuit.
• Controlled arc voltage reduces stress to circuit components during
fuse clearing.
• Choice of mounting types provides options for unique termination
requirements.
• Indicator options allow identification of blown fuses.
Applications
Protection of heavy duty devices such as electromechanical rectifiers.
Ordering Information
LA 15 QS 400 -4 TI
Littelfuse
Voltage
Special Purpose Fuses
(150)
Style
Ampere Rating
Mounting Type
Ferrule
Ferrule, midget dim.
Blades/Bolt-in
Hockey Puck, bolt-in
1
2
4
128
Integral Blown-
Fuse Indicator
Trigger Indicator
Trigger Actuator
TI
IL
Note: Mounting types and integral blown fuse indicators are optional for
specified ratings.
Specifications
Voltage Rating:
Interrupting Rating:
Ampere Range:
Approvals:
AC: 150 volts
DC: 150 volts
100,000 Amperes
1 – 6000 Amperes
UL Recognized under the components program.
Contact Littelfuse for characteristic curves.
88
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Products Catalog
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