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Special Purpose Fuses
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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.
May be used wherever extremely fast acting, current-limiting fuses with
no time-delay are required.Features & Benefits
• Extremely current-limiting
• Low I2t 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
Ratings
150V: 1 – 6000A
250V: 1 – 4500A
300V: 35 – 4500A
500V: 10 – 1200A
600V: 1 – 2000A
700V: 6 – 2500A
1000V: 15 – 1000A
1200V: 1 – 30A
1300V: 50 – 1800A
Recommended Fuse Blocks:
LSCR and 1LS series: Refer to the Blocks & Holders section of this catalog
for additional information.
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Traditional Semiconductor Fuses
150/250/500/600/700 VAC • Very Fast Acting • 1 – 1200 Amperes
Ampere
Ratings
Series & Voltage
L15S
150V AC
150V DC (1 – 60A)
100V DC (70 – 1000A)
L25S*
250V AC
250V DC (1 – 200A)
200V DC (225 – 800A)
L50S
500V AC
450V DC
L60S
600V AC
KLC‡
600V AC
L70S*
700V AC
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
171⁄2– – – L60S 171⁄2KLC 171⁄2–
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 – – LA50P9004 – – LA70P9004
1000 L15S 1000 – LA50P10004 – – LA70P10004
1200 – – LA50P12004 – – LA70P12004
‡ KLC series fuses are recommended for replacement use only.
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/450 VDC
L60S: 600 VAC
KLC: 600 VAC
L70S: 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.
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Special Purpose Fuses
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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
Fig.
No.
Dimensions in Inches (mm in parentheses)
A B C D E F G H
1 – 30 1 11⁄2
(38.1) —
3⁄8
(9.5)
13⁄32
(10.3) — — — —
31 – 60 1 2
(50.8) —
5⁄8
(15.9)
13⁄16
(20.6) — — — —
61 – 450 3 15⁄32
(29.4)
17⁄8
(47.6)
23⁄16
(55.6)
221⁄32
(67.5)
1
(25.4)
43 ⁄64
(17.1)
5⁄16
(7.9)
3⁄16
(4.8)
451 – 1000 3 11⁄4
(31.8)
115⁄16
(49.2)
29⁄16
(65.1)
31⁄2
(88.9)
11⁄2
(38.1)
1
(25.4)
13⁄32
(10.3)
1⁄4
(6.4)
E
H
F
GA
B
C
D
Fig, 2
A
C
D
Fig. 1
Contact Littelfuse for characteristic curves.
L25S SERIES, 250 VOLTS AC
(Replaces KLB)
Ampere
Rating
Fig.
No.
Dimensions in Inches (mm in parentheses)
A B C D E F G H
1 – 30 1 2
(50.8) —
1⁄2
(12.7)
9⁄16
(14.3) — — — —
31 – 60 2 15⁄8
(41.3)
21⁄4
(57.2)
21⁄2
(63.5)
33⁄16
(81.0)
13⁄16
(20.6)
23⁄32
(18.3)
11⁄32
(8.7)
1⁄8
(3.2)
61 – 200 3 15⁄8
(41.3)
25⁄16
(58.7)
27⁄16
(61.9)
31⁄8
(79.4)
17⁄32
(31.0)
1
(25.4)
5⁄16
(7.9)
3⁄16
(4.8)
201 – 700 3 119⁄32
(40.5)
29⁄32
(57.9)
229⁄32
(73.8)
327⁄32
(97.6)
11⁄2
(38.1)
1
(25.4)
13⁄32
(10.3)
1⁄4
(6.4)
701 – 800 3 119⁄32
(40.5)
29⁄32
(57.9)
229⁄32
(73.8)
327⁄32
(97.6)
2
(50.8)
11⁄2
(38.1)
13⁄32
(10.3)
1⁄4
(6.4)
L50S SERIES, 500 VOLTS AC / 450 VOLTS DC
(Replaces KLH)
Ampere
Rating
Fig.
No.
Dimensions in Inches (mm in parentheses)
A B C D E F G H
10 – 30 1 2
(50.8) —
1⁄2
(12.7)
9⁄16
(14.3) — — — —
31 – 60 2 15⁄8
(41.3)
21⁄4
(57.2)
21⁄2
(63.5)
33⁄16
(81.0)
13⁄16
(20.6)
23⁄32
(18.3)
11⁄32
(8.7)
1⁄8
(3.2)
61 – 100 3 21⁄8
(54.0)
211⁄16
(68.3)
3
(76.2)
35⁄8
(92.1)
1
(25.4)
3⁄4
(19.1)
11⁄32
(8.7)
1⁄8
(3.2)
101 – 200 3 21⁄8
(54.0)
213⁄16
(71.4)
215⁄16
(74.6)
35⁄8
(92.1)
17⁄32
(31.0)
1
(25.4)
5⁄16
(7.9)
3⁄16
(4.8)
201 – 400 3 23⁄32
(53.2)
225⁄32
(70.6)
313⁄32
(86.5)
411⁄32
(110.3)
11⁄2
(38.1)
1
(25.4)
13⁄32
(10.3)
1⁄4
(6.4)
401 – 600 3 27⁄32
(56.4)
229⁄32
(73.8)
317⁄32
(89.7)
415⁄32
(113.5)
2
(50.8)
11⁄2
(38.1)
13⁄32
(10.3)
1⁄4
(6.4)
601 – 800 3 27⁄32
(56.4)
49⁄32
(108.7)
45⁄8
(117.5)
615⁄32
(164.3)
21⁄2
(63.5)
2
(50.8)
17⁄32
(13.5)
3⁄8
(9.5)
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F
GA
B
CE
J
H
Fig. 4
Traditional Semiconductor Fuses
150/250/500/600/700 VAC • Very Fast Acting • 1 – 1000 Amperes
L70S SERIES, 700 VOLTS AC / 650 VOLTS DC
Ampere
Rating
Fig.
No.
Dimensions in Inches (mm in parentheses)
A B C D E F G H J
10 – 30 1 2
(50.8) —
1⁄2
(12.7)
9⁄16
(14.3) — — — — —
31 – 60 3 27⁄8
(73.0)
37⁄16
(87.3)
325⁄32
(96.0)
43⁄8
(111.1)
1
(25.4)
43 ⁄64
(17.1)
11⁄32
(8.7)
1⁄8
(3.2) —
61 – 100 3 27⁄8
(73.0)
39⁄16
(90.5)
311⁄16
(93.7)
43⁄8
(111.1)
17⁄32
(31.0)
29⁄32
(22.9)
5⁄16
(7.9)
3⁄16
(4.8) —
101 – 200 3 227⁄32
(72.2)
317⁄32
(89.7)
45⁄32
(105.6)
53⁄32
(129.4)
11⁄2
(38.1)
1
(25.4)
13⁄32
(10.3)
1⁄4
(6.4) —
201 – 400 3 227⁄32
(72.2)
317⁄32
(89.7)
45⁄32
(105.6)
53⁄32
(129.4)
2
(50.8)
11⁄2
(38.1)
13⁄32
(10.3)
1⁄4
(6.4) —
401 – 600 3 227⁄32
(72.2)
429⁄32
(124.6)
51⁄4
(133.4)
73⁄32
(180.2)
21⁄2
(63.5)
2
(50.8)
17⁄32
(13.5)
3⁄8
(9.5) —
601 – 800 4 35⁄16
(84.1)
55⁄16
(134.9)
613⁄16
(173.0) —27⁄8
(73.0)
2
(50.8)
5⁄8
(15.9)
3⁄8
(9.5)
5⁄16
(7.9)
KLC SERIES, 600 VOLTS AC
Ampere
Rating
Fig.
No.
Dimensions in Inches (mm in parentheses)
A B C D E F G H
1 – 30 2 17⁄8
(47.6)
21⁄2
(63.5) —27⁄8
(73.0)
9⁄16
(14.3)
13⁄32
(10.3)
1⁄4
(6.4)
3⁄64
(1.2)
31 – 60 2 23⁄4
(69.9)
33⁄8
(85.7)
35⁄8
(92.1)
45⁄16
(109.5)
13⁄16
(20.6)
23⁄32
(18.3)
11⁄32
(8.7)
1⁄8
(3.2)
61 – 100 3 27⁄8
(73.0)
321⁄32
(92.9)
41⁄16
(103.2)
5
(127.0)
1
(25.4)
3⁄4
(19.1)
13⁄32
(10.3)
1⁄8
(3.2)
101 – 200 3 227⁄32
(72.2)
317⁄32
(89.7)
43⁄8
(111.1)
53⁄32
(129.4)
11⁄2
(38.1)
1
(25.4)
13⁄32
(10.3)
1⁄4
(6.4)
201 – 400 3 227⁄32
(72.2)
421⁄32
(118.3)
427⁄32
(123.0)
61⁄4
(158.8)
2
(50.8)
15⁄8
(41.3)
9⁄16
(14.3)
1⁄4
(6.4)
401 – 800 3 227⁄32
(72.2)
421⁄32
(118.3)
511⁄32
(135.7)
61⁄4
(158.8)
21⁄2
(63.5)
2
(50.8)
9⁄16
(14.3)
3⁄8
(9.5)
L60S SERIES, 600 VOLTS AC
Ampere
Rating
Fig.
No.
Dimensions in Inches (mm in parentheses)
A B C D E F G H
1 – 30 1 5
(127.0) —
5⁄8
(15.9)
13⁄16
(20.6) — — — —
31 – 60 2 225⁄32
(70.6)
37⁄16
(87.3)
311⁄16
(93.7)
43⁄8
(111.1)
13⁄16
(20.6)
23⁄32
(18.3)
11⁄32
(8.7)
1⁄8
(3.2)
61 – 100 2 229⁄32
(73.8)
317⁄32
(89.7)
325⁄32
(96.0)
415⁄32
(113.5)
11⁄16
(27.0)
23⁄32
(18.3)
11⁄32
(8.7)
1⁄8
(3.2)
101 – 200 2 229⁄32
(73.8)
39⁄16
(90.5)
33⁄4
(95.3)
413⁄32
(111.9)
15⁄16
(33.3)
1
(25.4)
5⁄16
(7.9)
3⁄16
(4.8)
201 – 400 2 229⁄32
(73.8)
331⁄32
(100.8)
45⁄32
(105.6)
51⁄8
(130.2)
137⁄64
(40.1)
1
(25.4)
13⁄32
(10.3)
1⁄4
(6.4)
401 – 600 2 27⁄8
(73.0)
331⁄32
(100.8)
49⁄64
(105.2)
51⁄8
(130.2)
21⁄16
(52.8)
11⁄2
(38.1)
13⁄32
(10.3)
1⁄4
(6.4)
601 – 800 2 31⁄32
(77.0)
55⁄32
(133.4)
511⁄32
(135.7)
71⁄4
(184.2)
21⁄2
(63.5)
2
(50.8)
17⁄32
(13.5)
3⁄8
(9.5
A
B
C
D
F
G
E
H
Fig. 3
Contact Littelfuse for characteristic curves.
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LA15QS Semiconductor Fuses
150 VAC • Very Fast Acting • 1 – 6000 Amperes
Specifications
Voltage Rating: AC: 150 volts
DC: 150 volts
Interrupting Rating: 100,000 Amperes
Ampere Range: 1 – 6000 Amperes
Approvals: UL Recognized under the components program.
LA 15 QS 400 -4 TI
Style
Littelfuse
Ampere Rating
Mounting Type
Voltage
(150)
Integral Blown-
Fuse Indicator
Ferrule 1
Ferrule, midget dim. 2
Blades/Bolt-in 4
Hockey Puck, bolt-in 128
Trigger Indicator TI
Trigger Actuator IL
Contact Littelfuse for characteristic curves.
Note: Mounting types and integral blown fuse indicators are optional for
specified ratings.
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 I2t 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
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Ampere
Rating
Littelfuse
Catalog Number
Mounting
Type
Maximum
Clearing I2t @150
VAC (A2S x 103)
Watts Loss @
Rated Current
(W)
1 LA15QS1-2 2 0.0002 0.68
2 LA15QS2-2 2 0.001 1.3
3 LA15QS3-2 2 0.003 1.7
4 LA15QS4-2 2 0.007 2.1
5 LA15QS5-2 2 0.012 2.8
6 LA15QS6-2 2 0.022 3.1
7 LA15QS7-2 2 0.011 2.2
8 LA15QS8-2 2 0.015 2.5
10 LA15QS10-2 2 0.019 2.6
12 LA15QS12-2 2 0.030 3
15 LA15QS15-2 2 0.042 3
20 LA15QS20-2 2 0.072 4
25 LA15QS25-2 2 0.14 5.2
30 LA15QS30-2 2 0.25 5.6
35 LA15QS35-1 1 0.21 9
40 LA15QS40-1 1 0.28 10
40 LA15QS40-4TI 4TI 0.39 3.1
45 LA15QS45-1 1 0.34 12
50 LA15QS50-1 1 0.47 13
50 LA15QS50-4 4 0.64 4
55 LA15QS55-1 1 Contact Factory Contact Factory
60 LA15QS60-1 1 0.94 14
70 LA15QS70-4 4 2 5.6
70 LA15QS70-4TI 4TI 2 5.6
80 LA15QS80-4 4 2.5 8
80 LA15QS80-4TI 4TI 2.5 8
90 LA15QS90-4 4 3.1 9
100 LA15QS100-4 4 3.6 10
100 LA15QS100-4TI 4TI 3.6 10
130 LA15QS130-4 4 5.3 14
130 LA15QS130-4TI 4TI 5.3 14
150 LA15QS150-4 4 6.8 16
150 LA15QS150-4IL 4IL 6.8 16
150 LA15QS150-4TI 4TI 6.8 16
200 LA15QS200-4 4 9 22
200 LA15QS200-4IL 4IL 9 22
250 LA15QS250-4 4 15 22
LA15QS Semiconductor Fuses
150 VAC • Very Fast Acting • 1 – 6000 Amperes
Catalog Numbers & Technical Data
Ampere
Rating
Littelfuse
Catalog Number
Mounting
Type
Maximum
Clearing I2t @150
VAC (A2S x 103)
Watts Loss @
Rated Current
(W)
250 LA15QS250-4TI 4TI 15 27
300 LA15QS300-4 4 22 33
300 LA15QS300-4IL 4IL 22 33
300 LA15QS300-4TL 4TI 22 33
350 LA15QS350-4 4 32 40
350 LA15QS350-4TI 4TI 32 40
400 LA15QS400-4 4 40 45
400 LA15QS400-4IL 4IL 40 45
400 LA15QS400-4TI 4TI 40 45
450 LA15QS450-4 4 50 50
450 LA15QS450-4IL 4IL 50 50
500 LA15QS500-4 4 90 30
500 LA15QS500-4IL 4IL 90 30
600 LA15QS600-4 4 130 35
600 LA15QS600-4IL 4IL 130 35
800 LA15QS800-4 4 290 57
1000 LA15QS1000-4 4 520 75
1000 LA15QS1000-4IL 4IL 520 75
1000 LA15QS1000-4TI 4TI 520 75
1000 LA15QS1000-128 128 540 88
1000 LA15QS1000-128IL 128IL 540 88
1200 LA15QS1200-128 128 680 100
1200 LA15QS1200-128IL 128IL 680 100
1500 LA15QS1500-128 128 1200 130
1500 LA15QS1500-128IL 128IL 1200 130
2000 LA15QS2000-128 128 1900 165
2000 LA15QS2000-128IL 128IL 1900 165
2500 LA15QS2500-128 128 3200 195
2500 LA15QS2500-128IL 128IL 3200 195
3000 LA15QS3000-128 128 4800 240
3000 LA15QS3000-128IL 128IL 4800 240
3500 LA15QS3500-128 128 6500 260
4000 LA15QS4000-128 128 8500 270
4000 LA15QS4000-128IL 128IL 8500 270
5000 LA15QS5000-128 128 Contact Factory Contact Factory
6000 LA15QS6000-128 128 Contact Factory Contact Factory
Dimensions Dimensions for reference only.
Amperes Mount.
Type
Fig.
No.
Dimensions in Inches (mm in parentheses) Tap
A B C D E F G H
1 – 30 2 1 1.50 (38.1) 0.41 (10.4) – – – – – – –
35 – 60 1 1 2.00 (50.8) 0.81 (20.6) – – – – – – –
70 – 450 4, 4TI*, 4IL* 2, 3* 2.66 (67.6) 1.13 (28.7) 1.16 (29.5) 2.19 (55.6) 1.91 (48.5) 0.31 (7.9) 0.88 (22.4) 0.19 (4.8) –
500 – 1000 4, 4TI*, 4IL* 2, 3* 3.50 (88.9) 1.50 (38.1) 1.25 (31.8) 2.56 (65.0) 1.94 (49.3) 0.41 (10.4) 1.00 (25.4) 0.25 (6.4) –
750 – 2000 128, 128IL* 4, 5* 1.88 (47.9) 2.00 (50.8) 1.63 (41.4) 1.75 (44.5) 1.00 (25.4) – – – 3⁄8-24-1⁄2 deep
2500 – 3000 128, 128IL* 4, 5* 1.88 (47.9) 3.00 (76.2) 1.63 (41.4) 2.50 (63.5) 1.50 (38.1) – – – 1⁄2-20-1⁄2 deep
3500 – 4000 128, 128IL* 6, 7* 1.88 (47.9) 3.50 (88.9) 1.63 (41.4) 3.00 (76.2) 1.06 (27.0) 1.06 (27.0) – – 1⁄2-20-1⁄2 deep
5000 – 6000 128 8 2.38 (60.5) 5.75 (146) 1.88 (47.7) 5.00 (127) 1.50 (38.1) 1.50 (38.1) – – 1⁄2-20-1⁄2 deep
* Optional Trigger Actuator (IL)
Figure 1 Figure 2 Figure 3
Figure 4 Figure 5 Figure 6 Figure 7 Figure 8
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LA 30 QS 600 -4 TI
Style
Littelfuse
Ampere Rating
Mounting Type
Voltage
(300)
Integral Blown-
Fuse Indicator
Ferrule 1
Blades/Bolt-in 4
Hockey Puck, bolt-in 128
Trigger Indicator TI
Trigger Actuator IL
LA30QS Semiconductor Fuses
300 VAC • Very Fast Acting • 35 – 4500 Amperes
Specifications
Voltage Rating: AC: 300 volts
DC: 300 volts
Interrupting Rating: 200,000 Amperes
Ampere Range: 35 – 4500 Amperes
Approvals: UL Recognized under the components program.
Littelfuse LA30QS series Semiconductor protection fuses are intended
for the protection of Power Semiconductors such as diodes, phase
control SCR’s and other power semiconductor devices. The LA30QS is
recommended for new applications providing solutions for your critical
protection needs for 300V and less semiconductors.
Features
• Low I2t 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.
• Superior DC capabilities.
Applications
Protection of 300 volt heavy duty rectifiers and similar heavy duty
power supplies.
Ordering Information
Note: Mounting types and integral blown fuse indicators are optional for
specified ratings.
Contact Littelfuse for characteristic curves.
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LA30QS Semiconductor Fuses
300 VAC • Very Fast Acting • 35 – 4500 Amperes
Ampere
Rating
Littelfuse
Catalog
Number
Mounting
Type
Maximum
Clearing I2t
@300 VAC
(A2S x 103)
Watts Loss
@ Rated
Current (W)
35 LA30QS35-4 4 0.9 6.4
40 LA30QS40-4 4 1.2 7
50 LA30QS50-4 4 2 9.9
60 LA30QS60-4 4 2.7 11.6
70 LA30QS70-4 4 1.6 11
80 LA30QS80-4 4 2.6 11
90 LA30QS90-4 4 3.2 13
100 LA30QS100-4 4 4.1 13
100 LA30QS100-4TI 4TI 4.1 13
125 LA30QS125-4 4 6.3 16
130 LA30QS130-4 4 6.3 16
150 LA30QS150-4 4 9.3 19
150 LA30QS150-4TI 4TI 9.3 19
175 LA30QS175-4 4 10 27
200 LA30QS200-4 4 15 30
200 LA30QS200-4TI 4TI 15 30
225 LA30QS225-4 4 22 33
250 LA30QS250-4 4 25 41
250 LA30QS250-4TI 4TI 25 41
300 LA30QS300-4 4 37 47
300 LA30QS300-4TI 4TI 37 47
350 LA30QS350-4 4 62 49
400 LA30QS400-4 4 83 56
400 LA30QS400-4IL 4IL 83 56
400 LA30QS400-4TI 4TI 83 56
450 LA30QS450-4 4 130 53
Catalog Numbers & Technical Data
Ampere
Rating
Littelfuse
Catalog
Number
Mounting
Type
Maximum
Clearing I2t
@300 VAC
(A2S x 103)
Watts Loss
@ Rated
Current (W)
500 LA30QS500-4 4 160 59
550 LA30QS550-4 4 190 65
600 LA30QS600-4 4 230 69
600 LA30QS600-4TI 4TI 230 69
600 LA30QS600-4IL 4IL 230 69
700 LA30QS700-4 4 260 90
700 LA30QS700-128 128 260 73
800 LA30QS800-4 4 330 108
800 LA30QS800-4IL 4IL 330 108
800 LA30QS800-128 128 330 84
1000 LA30QS1000-128 128 460 105
1000 LA30QS1000-128IL 128IL 460 105
1200 LA30QS1200-128 128 880 110
1500 LA30QS1500-128 128 1400 140
1500 LA30QS1500-128IL 128IL 1400 140
1600 LA30QS1600-128 128 1690 150
2000 LA30QS2000-128 128 2600 190
2000 LA30QS2000-128IL 128IL 2600 190
2500 LA30QS2500-128 128 4000 230
2500 LA30QS2500-128IL 128IL 4000 230
3000 LA30QS3000-128 128 4700 340
3500 LA30QS3500-128 128 6500 380
3500 LA30QS3500-128IL 128IL 6500 380
4000 LA30QS4000-128 128 8600 450
4500 LA30QS4500-128 128 11000 500
1.17
C
A
D
B
E
F
0.50
TAP
[ 29.8 mm ]
[ 12.8 mm ]
Figure 1 Figure 2 Figure 3
Figure 4 Figure 5 Figure 6
Dimensions Dimensions for reference only.
Amperes Mount. Type Fig. No. Dimensions in Inches (mm in parentheses) Tap
A B C D E F G H
35 – 60 4 1 3.19 (81.0) 0.81 (20.6) 1.63 (41.4) 2.50 (63.5) 2.25 (57.5) 0.34 (8.6) 0.72 (18.3) 0.13 (3.3) –
70 – 200 4 2 3.13 (79.5) 1.22 (31.0) 1.63 (41.4) 2.44 (62.0) 2.31 (58.7) 0.31 (7.9) 1.00 (25.4) 0.19 (4.8) –
225 – 700 4, 4IL* 2, 3* 3.84 (97.5) 1.50 (38.1) 1.59 (40.1) 2.91 (73.9) 2.28 (57.9) 0.41 (10.4) 1.00 (25.4) 0.25 (6.4) –
700 – 1200 128 4 2.59 (65.8) 3.00 (76.2) 2.34 (59.4) 2.50 (63.5) 1.50 (38.1) – – – 3⁄8-24-1⁄2 deep
1500 – 2500 128, 128IL* 5, 6* 2.59 (65.8) 3.50 (88.9) 2.34 (59.4) 3.00 (76.2) 1.50 (38.1) 1.50 (38.1) – – 3⁄8-24-1⁄2 deep
3000 – 4500 128, 128IL* 5, 6* 2.59 (65.8) 4.50 (114) 2.34 (59.4) 3.75 (95.3) 1.50 (38.1) 1.50 (38.1) – – 1⁄2-20-1⁄2 deep
* Optional Actuator (IL)
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Special Purpose Fuses
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LA 50 QS 250 -4
Style
Littelfuse
Ampere Rating
Mounting Type
(Blades/Bolt-in)
Voltage
(500)
LA50QS Semiconductor Fuses
500 VAC • Very Fast Acting • 35 – 1200 Amperes
Specifications
Voltage Rating: AC: 500 volts
DC: 500 volts
Interrupting Rating: AC: 200,000 Amperes
DC: 100,000 Amperes
Ampere Range: 35 – 1200 Amperes
Approvals: UL Recognized under the components program
CSA Certified.
In response to new equipment requirements, Littelfuse LA50QS
series fuses were developed to improve the overall performance
of semiconductor fuses. The LA50QS provides the best protection
features including lower I2t, longer life when subjected to cyclic loading
and lower watts loss. LA50QS is today’s choice for the protection of
dynamic solid state equipment.
Features
• Lowest I2t for greatest protection of semiconductor circuits.
• Low watts loss for cooler operation.
• Superior cycling ability gives an equipment design advantage.
• State-of-the-art protection for 500 volt equipment.
• Ultra compact sizes allow down-sizing of existing equipment.
Applications
Protection of 500 volts or less solid state equipment such as motor
drives, UPS, inverters, etc.
Ordering Information
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LA50QS Semiconductor Fuses
500 VAC • Very Fast Acting • 35 – 1200 Amperes
Ampere
Rating
Littelfuse
Catalog
Number
Mounting
Type
Maximum
Clearing I2t @500
VAC (A2S x 103)
Watts Loss
@ Rated
Current (W)
35 LA50QS35-4 4 0.56 6
40 LA50QS40-4 4 0.69 7
50 LA50QS50-4 4 1.1 8
60 LA50QS60-4 4 1.8 10
70 LA50QS70-4 4 1.9 12
80 LA50QS80-4 4 2.6 14
90 LA50QS90-4 4 3.6 15
100 LA50QS100-4 4 4.4 17
125 LA50QS125-4 4 5.6 21
150 LA50QS150-4 4 9 25
175 LA50QS175-4 4 15 29
200 LA50QS200-4 4 20 33
225 LA50QS225-4 4 25 37
Catalog Numbers & Technical Data
Ampere
Rating
Littelfuse
Catalog
Number
Mounting
Type
Maximum
Clearing I2t @500
VAC (A2S x 103)
Watts Loss
@ Rated
Current (W)
250 LA50QS250-4 4 29 41
300 LA50QS300-4 4 55 49
350 LA50QS350-4 4 88 57
400 LA50QS400-4 4 98 65
450 LA50QS450-4 4 130 69
500 LA50QS500-4 4 160 77
600 LA50QS600-4 4 220 92
700 LA50QS700-4 4 270 110
800 LA50QS800-4 4 360 130
900 LA50QS900-4 4 500 140
1000 LA50QS1000-4 4 560 160
1200 LA50QS1200-4 4 930 175
Dimensions
Dimensions for reference only.
Amperes Mount.
Type
Dimensions in Inches (mm in parentheses)
A B C D E F G H
35 – 100 4 3.63
(92.2)
1.00
(25.4)
2.13
(54.1)
2.94
(74.7)
2.75
(69.9)
0.31
(7.9)
0.75
(19.1)
0.13
(3.3)
125 – 200 4 3.63
(92.2)
1.22
(31.0)
2.13
(54.1)
2.94
(74.7)
2.81
(71.4)
0.31
(7.9)
1.00
(25.4)
0.19
(4.8)
225 – 400 4 4.34
(110)
1.50
(38.1)
2.09
(53.1)
3.41
(86.6)
2.78
(70.6)
0.41
(10.4)
1.00
(25.4)
0.25
(6.4)
450 – 600 4 4.47
(114)
2.00
(50.8)
2.22
(56.4)
3.53
(89.7)
2.91
(73.9)
0.41
(10.4)
1.50
(38.1)
0.25
(6.4)
700 – 800 4 6.47
(164.3)
2.50
(63.5)
2.22
(56.4)
5.00
(127.0)
3.44
(87.3)
0.53
(13.5)
1.50
(38.1)
0.25
(6.4)
900 – 1200 4 6.97
(177.0)
3.00
(76.2)
3.22
(81.8)
5.47
(138.9)
4.47
(113.5)
0.63
(15.9)
2.38
(60.3)
0.44
(11.1)
Contact Littelfuse for characteristic curves.
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Special Purpose Fuses
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LA 60 Q 30 -2
Style
Littelfuse
Ampere Rating
Mounting Type
Voltage
(300)
Ferrule, midget dim. 1-½” x 13/32”
LA60Q Semiconductor Fuses
600 VAC • Very Fast Acting • 5 – 40 Amperes
Specifications
Voltage Rating: AC: 600 volts
DC: 600 volts
Interrupting Rating: AC: 200,000 Amperes
DC: 100,000 Amperes
Ampere Range: 5 – 40 Amperes
Approvals: UL Recognized under the components program.
Recommended Fuse Blocks
LPSM or L60030M
Catalog Numbers & Technical Data
Ampere
Rating
Littelfuse
Catalog
Number
Mounting
Type
Maximum
Clearing I2t @600
VAC (A2S)
Watts Loss @
Rated Current (W)
5 LA60Q5-2 2 60 0.7
8 LA60Q8-2 2 70 1.1
10 LA60Q10-2 2 110 1.6
12 LA60Q12-2 2 150 2
15 LA60Q15-2 2 180 3
20 LA60Q20-2 2 330 4.4
25 LA60Q25-2 2 440 5.5
30 LA60Q30-2 2 860 5.6
35 LA60Q35-2 2 1300 6.4
40 LA60Q40-2 2 1800 7
Contact Littelfuse for characteristic curves.
Littelfuse LA60Q semiconductor protection fuses feature a 600 volt
AC/DC rating in a compact size (11⁄2” x 13 ⁄32”). LA60Q also has the lowest
I2t of all similar fuses and excellent cycling ability. Applications include
inverters and small equipment requiring extremely fast response to
faults, without the need to carry sustained heavy overloads.
Features
• Lowest I2t of any fuse this size for greater protection.
• Excellent cycling ability gives advantage in equipment design.
Dimensions (in inches)
Ordering Information
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LA 60 X 700 -128
Style
Littelfuse
Ampere Rating
Mounting Type
Voltage
(300)
Hockey Puck, bolt-in
LA60X Semiconductor Fuses
600 VAC • Very Fast Acting • 700 – 2000 Amperes
Littelfuse LA60X semiconductor protection fuses are popular for the
protection of higher voltage heavy rectifiers such as traction rectifiers.
They can carry long sustained overloads common with heavy-duty
apparatus. The compact “hockey puck” design provides high power
protection in a small space.
Features
• Lowest I2t minimizes damage to protected components on
short- circuit.
• Controlled arc voltage reduces stress to circuit components during
fuse clearing.
Applications
Protection of heavy traction and electrochemical as well as rectifiers and
other heavy-duty equipment.
Ordering Information
Dimensions Dimensions for reference only.
Amperes Mount.
Type
Fig.
No.
Dimensions in Inches (mm in parentheses) Tap
A B C D E F
700 – 800 128 1 4.00
(102)
3.00
(76.2)
3.75
(95.3)
2.50
(63.5)
1.50
(38.1) -3⁄8-24-1⁄2 deep
1000 – 1200 128 2 4.00
(102)
3.50
(88.9)
3.75
(95.3)
3.00
(76.2)
1.50
(38.1)
1.50
(38.1)
3⁄8-24-1⁄2 deep
1500 – 2000 128 2 4.00
(102)
4.50
(114)
3.75
(95.3)
3.75
(95.3)
1.50
(38.1)
1.50
(38.1)
1⁄2-20-1⁄2 deep
Contact Littelfuse for technical information.
Figure 1 Figure 2
Specifications
Voltage Rating: AC: 600 volts
Interrupting Rating: AC: 100,000 Amperes
Ampere Range: 700 – 2000 Amperes
Approvals: UL Recognized under the components program.
Ampere Ratings
700 1200 1800
800 1500 2000
1000 1600
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LA 70 QS 150 -4
Style
Littelfuse
Ampere Rating
Mounting Type
Voltage
(300)
Blades/Bolt-in
LA70QS Semiconductor Fuses
700 VAC • Very Fast Acting • 35 – 800 Amperes
Littelfuse LA70QS semiconductor fuses were developed to provide
improved performance required by today’s new equipment. The
LA70QS features lower I2t, improved cycling, and lower watts loss. It is
the best choice for the protection of dynamic solid-state equipment.
Features
• Very low I2t improved protection of equipment.
• Superior cycling ability for long, reliable life on high cycling loading.
• Lower watts loss for cooler operation.
• 700 Volt AC/DC rating provides greater design versatility.
• Compact sizes allow downsizing of equipment.
Applications
Protection of 700 volt or less solid state equipment such as motor
drives, UPS, inverters, etc.
Ordering Information
Specifications
Voltage Rating: AC: 700 Volts
DC: 700 Volts
Interrupting Rating: AC: 200,000 Amperes
DC: 100,000 Amperes
Ampere Range: 35 – 800 Amperes
Approvals: UL Recognized under the components program.
CSA Certified.
Special Purpose Fuses
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Special Purpose Fuses
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Ampere
Rating
Littelfuse
Catalog Number
Mounting
Type
Maximum
Clearing I2t @700
VAC (A2S x 103)
Watts Loss @
Rated Current (W)
200 LA70QS200-4 4 19 41
200 LA70QS200-4K 4 19 41
250 LA70QS250-4 4 42 42
300 LA70QS300-4 4 55 53
350 LA70QS350-4 4 72 64
400 LA70QS400-4 4 99 75
450 LA70QS450-4 4 125 75
450 LA70QS450-4K 4K 125 75
500 LA70QS500-4 4 150 92
500 LA70QS500-4K 4K 160 92
600 LA70QS600-4 4 222 116
600 LA70QS600-4K 4K 222 116
700 LA70QS700-4 4 332 125
800 LA70QS800-4 4 433 143
Ampere
Rating
Littelfuse
Catalog
Number
Mounting
Type
Maximum
Clearing I2t @700
VAC (A2S x 103)
Watts Loss @
Rated Current (W)
35 LA70QS35-4 4 0.47 6.2
40 LA70QS40-4 4 0.58 7.5
50 LA70QS50-4 4 0.88 9.8
60 LA70QS60-4 4 1.2 12
70 LA70QS70-4 4 1.8 15
80 LA70QS80-4 4 2.3 16
90 LA70QS90-4 4 3 20
100 LA70QS100-4 4 3.6 24
125 LA70QS125-4 4 6.9 22
125 LA70QS125-4K 4K 6.9 22
150 LA70QS150-4 4 11 28
150 LA70QS150-4K 4K 11 29
175 LA70QS175-4 4 14 35
175 LA70QS175-4K 4K 14 35
LA70QS Semiconductor Fuses
700 VAC • Very Fast Acting • 35 – 800 Amperes
Catalog Numbers & Technical Data
Dimensions Dimensions for reference only.
Amperes Mount. Type Dimensions in Inches (mm in parentheses)
A B C D E F G H
35 – 100 4 4.38
(111)
1.00
(25.4)
2.88
(73)
3.69
(93.6)
3.50
(88.9)
0.31
(7.9)
0.75
(19.0)
0.13
(3.2)
125 – 200 4 4.38
(111)
1.22
(31.0)
2.88
(73)
3.69
(93.6)
3.56
(90.5)
0.31
(7.9)
1.00
(25.4)
0.19
(4.8)
125 – 200 4K 5.09
(129)
1.22
(31.0)
2.88
(73)
4.19
(106)
3.50
(88)
0.41
(10.3)
1.00
(25.4)
0.19
(4.8)
225 – 400 4 5.09
(129)
1.50
(38.1)
2.84
(72.2)
4.16
(106)
3.53
(89.7)
0.40
(10.3)
1.50
(38.1)
0.25
(6.4)
450 – 600 4 5.09
(129)
2.00
(50.8)
2.84
(72.2)
4.16
(106)
3.53
(89.7)
0.41
(10.3)
1.50
(38.1)
0.25
(6.4)
450 – 600 4K 7.09
(180)
2.00
(50.8)
2.84
(72.2)
6.16
(156)
3.53
(89.7)
0.53
(13.5)
1.50
(38.1)
0.25
(6.4)
700 – 800 4 7.09
(180)
2.50
(63.5)
2.84
(72.2)
5.28
(134)
4.91
(125)
0.53
(13.5)
2.00
(50.8)
0.38
(9.5)
Contact Littelfuse for characteristic curves.
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Special Purpose Fuses
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LA 70 QS 20 -14F I
Style
Littelfuse
Ampere Rating
Size
Voltage
(700)
Optional Striker
14 x 51mm 14F
22 x 58mm 22F
(I)
LA70QS French Cylindrical Fuses
690 Volts • Very Fast Acting • 10 – 100 Amperes
Specifications
Voltage Rating: AC: 690 Volts
DC: 700 Volts
Interrupting Rating: AC: 200,000 Amperes
DC: 100,000 Amperes
Ampere Range: 10 – 100 Amperes
Approvals: UL Recognized under the components program.
CSA Certified.
Recommended Fuse Blocks
CYH series for non-striker fuses LA70QS(amp)22F
LPSG series for the striker style LA70QS(amp)22FI
Ordering Information
Catalog Numbers & Technical Data
Ampere
Rating
Littelfuse
Catalog
Number
(No Striker)
Littelfuse
Catalog
Number
(With Striker)
Body
Size
Maximum
Clearing I2t
@700 VAC
(A2S x 103)
Watts Loss
@ Rated
Current (W)
10 LA70QS10-14F LA70QS10-14FI 14x51 0.04 3.5
12 LA70QS12-14F LA70QS12-14FI 14x51 0.06 4.4
16 LA70QS16-14F LA70QS16-14FI 14x51 0.10 4.8
20 LA70QS20-14F LA70QS20-14FI 14x51 0.16 5.2
25 LA70QS25-14F LA70QS25-14FI 14x51 0.27 5.8
32 LA70QS32-14F LA70QS32-14FI 14x51 1.50 7.0
40 LA70QS40-14F LA70QS40-14FI 14x51 0.70 10.7
50 LA70QS50-14F LA70QS50-14FI 14x51 1.50 11.6
20 LA70QS20-22F LA70QS20-22FI 22x58 0.076 8.0
25 LA70QS25-22F LA70QS25-22FI 22x58 0.125 10.0
32 LA70QS32-22F LA70QS32-22FI 22x58 0.27 11.0
40 LA70QS40-22F LA70QS40-22FI 22x58 0.48 13.0
50 LA70QS50-22F LA70QS50-22FI 22x58 0.80 14.9
63 LA70QS63-22F LA70QS63-22FI 22x58 1.85 16.0
80 LA70QS80-22F LA70QS80-22FI 22x58 3.80 17.8
100 LA70QS100-22F LA70QS100-22FI 22x58 8.00 19.0
Fuse Size Dimensions in mm
A B C D E
14x51 (no striker) 14 51 14 – –
22x58 (no striker) 22 58 16 – –
14x51 (with striker) 14 51 14 7.5 3.8
22x58 (with striker) 22 58 16 7.5 3.8
Dimensions for reference only.
A
B
C
A
B
C
D
E
Littelfuse French Cylindrical style semiconductor fuses are an extension
to the LA70QS series. They offer a solid-fill design with high interrupting
ratings and an optional striker for visual or remote blown fuse indication.
The international 14x51mm and 22x58mm sizes are accepted
worldwide.
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LA 100 P 80 -4 TI
Style
Littelfuse
Ampere Rating
Mounting Type
Voltage
(1000)
Integral Blown-
Fuse Indicator
Ferrule 1
Blades/Bolt-in 4
Trigger Indicator TI
LA100P Semiconductor Fuses
1000 VAC • Very Fast Acting • 15 – 1000 Amperes
Specifications
Voltage Rating: AC: 1000 Volts
DC: 750 Volts
Interrupting Rating: 100,000 Amperes
Ampere Range: 15 – 1000 Amperes
Approvals: UL Recognized under the components program.
Littelfuse LA100P semiconductor protection fuses are rated 1000V,
extending the range of protection for UPS systems, AC and DC drives,
reduced voltage motor starters and similar applications where lower I2t
and superior reliability are needed. With ratings from 15-1000 amperes,
a wide range of high voltage applications can be served.
Features
• Low I2t minimizes damage to protected components on short-circuit.
• Controlled arc voltage reduces stress to circuit components during
fuse clearing.
Applications
Protection of UPS systems, AC/DC drives, reduced voltage motor
starters and other 1000V or less semiconductor devices.
Ordering Information
Note: Mounting types and integral blown fuse indicators are optional for
specified ratings.
Special Purpose Fuses
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Special Purpose Fuses
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Ampere
Rating
Littelfuse
Catalog
Number
Mounting
Type
Maximum
Clearing I2t @1000
VAC (A2S x 103)
Watts Loss @
Rated Current (W)
200 LA100P200-4 4 72 36
200 LA100P200-4TI 4TI 72 36
225 LA100P225-4 4 91 40
250 LA100P250-4 4 110 46
300 LA100P300-4 4 160 55
300 LA100P300-4TI 4TI 160 55
350 LA100P350-4 4 220 65
350 LA100P350-4TI 4TI 220 65
400 LA100P400-4 4 290 70
400 LA100P400-4TI 4TI 290 70
500 LA100P500-4 4 450 90
500 LA100P500-4TI 4TI 450 90
600 LA100P600-4 4 650 110
600 LA100P600-4TI 4TI 650 110
650 LA100P650-4 4 780 120
700 LA100P700-4 4 880 125
800 LA100P800-4 4 1200 140
800 LA100P800-4TI 4TI 1200 140
1000 LA100P1000-4 4 1900 190
Ampere
Rating
Littelfuse
Catalog
Number
Mounting
Type
Maximum
Clearing I2t @1000
VAC (A2S x 103)
Watts Loss @
Rated Current (W)
15 LA100P15-1 1 0.6 3.4
20 LA100P20-1 1 0.8 5.9
25 LA100P25-1 1 1,3 9
30 LA100P30-1 1 1.5 12.8
35 LA100P35-4 4 2.2 7.3
40 LA100P40-4 4 2.9 8.3
50 LA100P50-4 4 4.5 11
50 LA100P50-4TI 4TI 4.5 11
60 LA100P60-4 4 6.5 13
60 LA100P60-4TI 4TI 6.5 13
70 LA100P70-4TI 4TI 8.8 13
80 LA100P80-4 4 12 14
80 LA100P80-4TI 4TI 12 14
100 LA100P100-4 4 18 18
100 LA100P100-4TI 4TI 18 18
125 LA100P125-4 4 28 23
125 LA100P125-4TI 4TI 28 23
150 LA100P150-4 4 41 28
150 LA100P150-4TI 4TI 41 28
LA100P Semiconductor Fuses
1000 VAC • Very Fast Acting • 15 – 1000 Amperes
Catalog Numbers & Technical Data
Dimensions Dimensions for reference only.
Amperes Mount. Type Fig. No. Dimensions in Inches (mm in parentheses)
A B C D E F G H J
15 – 30 1 1 2.53
(66.8)
0.56
(14.2) –––––––
35 – 60 4, 4TI 2 5.00
(127)
1.00
(25.4)
3.50
(173)
4.31
(109)
4.19
(106)
0.31
(7.9)
0.75
(19.1)
0.13
(3.3) –
65 – 100 4, 4TI 2 5.00
(127)
1.22
(31)
3.50
(173)
4.31
(109)
4.19
(106)
0.31
(7.9)
1.00
(25.4)
0.19
(4.8) –
125 – 200 4, 4TI 2 5.72
(145)
2.00
(38.1)
3.47
(88.1)
4.78
(121)
4.16
(106)
0.41
(10.4)
1.00
(25.4)
0.25
(6.4) –
225 – 400 4, 4TI 2 5.72
(145)
2.00
(50.8)
3.47
(88.1)
4.78
(121)
4.16
(106)
0.41
(10.4)
1.50
(25.4)
0.25
(6.4) –
500 – 600 4, 4TI 2 7.72
(196)
2.50
(63.5)
3.47
(88.1)
5.88
(149)
5.56
(147)
0.53
(13.5)
2.00
(50.8)
0.38
(9.7) –
650 – 800 4, 4TI 3 7.44
(189)
2.88
(73.2)
3.94
(100)
5.94
(151) –0.63
(16)
2.00
(50.8)
0.38
(9.7)
0.31
(7.9)
1000 4 4 8.22
(209)
3.50
(88.9)
4.47
(114)
6.59
(167)
5.84
(148)
0.63
(16)
2.75
(69.9)
0.50
(12.7)
1.38
(35.1)
Contact Littelfuse for characteristic curves.
Figure 1
Figure 3
Figure 2
Figure 4
Special Purpose Fuses
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LA 120 X 25 -1
Style
Littelfuse
Ampere Rating
Mounting Type
Voltage
(1200)
Ferrule
Catalog Numbers & Technical Data
Ampere
Rating
Littelfuse Catalog
Number Mounting Type Maximum Clearing I2t
@1200 VAC (A2S)
1⁄2LA120A1/2-1 1 1.9
1 LA120X1-1 1 7.5
2 LA120X2-1 1 30
3 LA120X3-1 1 69
4 LA120X4-1 1 120
5 LA120X5-1 1 190
6 LA120X6-1 1 280
10 LA120X10-1 1 970
15 LA120X15-1 1 2100
20 LA120X20-1 1 3700
25 LA120X25-1 1 5700
30 LA120X30-1 1 8300
LA120X Semiconductor Fuses
1200 VAC • Very Fast Acting • 1/2 – 30 Amperes
Littelfuse LA120X semiconductor protection fuses, rated 1/2 through
30A, 1200 VAC are popular for use in traction drive auxiliary circuits and
similar applications. LA120X fuses are also suitable for use on 1000VDC
auxiliary circuits with low time constants.
Features
• 1000 Volt DC rating for a wide range of circuits.
• Compact size fits in where competitive sizes will not fit.
Applications
Protection of traction drive auxiliary circuits, etc.
Dimensions
In Inches (mm in parentheses)
Ordering Information
Specifications
Voltage Rating: AC: 1200 Volts
DC: 1000 Volts
Interrupting Rating: 100,000 Amperes
Ampere Range: 1⁄2 – 30 Amperes
Note: Mounting type 1 can use 109002 and 129002 clips.
4 5/8
(117)
.812
(20.6)
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LA 070 URD 31 LI 350
Class
Littelfuse
Size
Mounting Type
Voltage
(070=700V
130=1300V)
Amp Rating
Straight-blade KI LI
Straight-blade LI LLI
Flat-type, one hole TTI TTI
700V 1300V
30
31
32
33
70
71
72
73
Square Body Semiconductor Fuses
700/1300 VAC • Very Fast Acting • 40 – 2500 Amperes
Littelfuse North American style square body semiconductor fuses
provide maximum flexibility in equipment design and ultimate protection
for today’s power conversion equipment. Available in different body
sizes and multiple mounting styles, the broad range of ampere ratings
allows great flexibility in equipment design.
Engineered to provide state-of-the-art protection for SCR’s, diodes,
thyristors, GTO’s, and IGBT devices, Littelfuse square body fuses have
pure die-cut elements embedded in solidified sand to control arcing and
lower I2t. All fuses are also equipped with a blown fuse trip indicator.
Features
• Choice of mounting styles provides a wide choice for equipment
design.
• Broad range of ampere ratings in a given body size for design
flexibility.
• Very low I2t minimizes damage to protected components.
• Superior cycling ability for long, reliable life on high cyclic loading.
• Extremely fast acting and current-limiting for improved protection to
equipment.
Applications
Protection of rectifiers, inverters, DC drives, UPS systems, reduced
voltage motor starters, and other equipment in globally accepted
applications.
Specifications
Voltage Rating: AC: 700 Volts (LA070)
1300 Volts (LA130)
DC: Contact factory
Interrupting Rating: AC: 200,000 Amperes (LA070)
100,000 Amperes (LA130)
DC: Contact factory
Ampere Range: 40 – 2500 Amperes
Approvals: UL Recognized Component
Ordering Information
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700 Volt North American Style Ratings and Application Data
Body Size Amp
Rating
Rated
Voltage
Melting I2t
(A2S x 103)
Total I2t
@ Rated
Voltage
(A2S x 103)
**Watts
Loss @ Rated
Current
(W)
Long Blade
Catalog No.
Type LI
Short Blade
Catalog No.
Type KI
Tapped Terminal
Catalog No.
Type TTI
63 700 0.2 1.2 14 LA070URD30LI0063 LA070URD30KI0063 LA070URD30TTI0063
80 700 0.33 1.9 19 LA070URD30LI0080 LA070URD30KI0080 LA070URD30TTI0080
100 700 0.47 2.7 26 LA070URD30LI0100 LA070URD30KI0100 LA070URD30TTI0100
125 700 0.85 4.9 30 LA070URD30LI0125 LA070URD30KI0125 LA070URD30TTI0125
160 700 1.6 9.2 37 LA070URD30LI0160 LA070URD30KI0160 LA070URD30TTI0160
200 700 3 16.7 42 ⁄ 43 LA070URD30LI0200 LA070URD30KI0200 LA070URD30TTI0200
30 250 700 5.8 32.4 48 ⁄ 50 LA070URD30LI0250 LA070URD30KI0250 LA070URD30TTI0250
315 700 12 67 53 ⁄ 55 LA070URD30LI0315 LA070URD30KI0315 LA070URD30TTI0315
350 700 15.5 86 57 ⁄ 60 LA070URD30LI0350 LA070URD30KI0350 LA070URD30TTI0350
400 700 23 130 60 ⁄ 65 LA070URD30LI0400 LA070URD30KI0400 LA070URD30TTI0400
450 700 26 165 80 ⁄ 88 LA070URD30LI0450 LA070URD30KI0450 LA070URD30TTI0450
500 700 41 264 80 ⁄ 88 LA070URD30LI0500 LA070URD30KI0500 LA070URD30TTI0500
550 700 52 330 80 ⁄ 90 LA070URD30LI0550 LA070URD30KI0550 LA070URD30TTI0550
200 700 2.5 14.6 45 LA070URD31LI0200 LA070URD31KI0200 LA070URD31TTI0200
250 700 4.7 27 52 LA070URD31LI0250 LA070URD31KI0250 LA070URD31TTI0250
315 700 7.5 43 65 LA070URD31LI0315 LA070URD31KI0315 LA070URD31TTI0315
350 700 10.5 59 67 LA070URD31LI0350 LA070URD31KI0350 LA070URD31TTI0350
400 700 19 110 68 LA070URD31LI0400 LA070URD31KI0400 LA070URD31TTI0400
31 450 700 26.5 150 70 LA070URD31LI0450 LA070URD31KI0450 LA070URD31TTI0450
500 700 37 210 70 ⁄ 72 LA070URD31LI0500 LA070URD31KI0500 LA070URD31TTI0500
550 700 52 300 70 ⁄ 75 LA070URD31LI0550 LA070URD31KI0550 LA070URD31TTI0550
630 700 75 421 75 ⁄ 85 LA070URD31LI0630 LA070URD31KI0630 LA070URD31TTI0630
700 700 95 530 85 ⁄ 95 LA070URD31LI0700 LA070URD31KI0700 LA070URD31TTI0700
800 700 140 880 105 ⁄ 120 LA070URD31LI0800 LA070URD31KI0800 LA070URD31TTI0800
400 700 15 86 72 ⁄ 75 LA070URD32LI0400 LA070URD32KI0400 LA070URD32TTI0400
450 700 22 124 77 ⁄ 80 LA070URD32LI0450 LA070URD32KI0450 LA070URD32TTI0450
500 700 28 157 85 ⁄ 90 LA070URD32LI0500 LA070URD32KI0500 LA070URD32TTI0500
550 700 37 211 90 ⁄ 95 LA070URD32LI0550 LA070URD32KI0550 LA070URD32TTI0550
630 700 54 302 95 ⁄ 105 LA070URD32LI0630 LA070URD32KI0630 LA070URD32TTI0630
700 700 76 432 100 ⁄ 110 LA070URD32LI0700 LA070URD32KI0700 LA070URD32TTI0700
32 800 700 115 648 110 ⁄ 120 LA070URD32LI0800 LA070URD32KI0800 LA070URD32TTI0800
900 700 170 972 110 ⁄ 125 LA070URD32LI0900 LA070URD32KI0900 LA070URD32TTI0900
1000 700 240 1350 115 ⁄ 135 LA070URD32LI1000 LA070URD32KI1000 LA070URD32TTI1000
1100 650 270 1620 140 ⁄ 165 LA065URD32LI1100 – LA065URD32TTI1100
1250 600 410 2100 150 ⁄ 180 LA060URD32LI1250 – LA060URD32TTI1250
1400 550 555 2600 160 ⁄ 190 LA055URD32LI1400 – LA055URD32TTI1400
1600 550 870 4000 165 ⁄ 195 LA055URD32LI1600 – LA055URD32TTI1600
1800 500 1050 4400 195 ⁄ 330 LA050URD32LI1800 – LA050URD32TTI1800
500 700 19 108 105 LA070URD33LI0500 LA070URD33KI0500 LA070URD33TTI0500
550 700 27 151 105 ⁄ 110 LA070URD33LI0550 LA070URD33KI0550 LA070URD33TTI0550
630 700 40 227 110 ⁄ 120 LA070URD33LI0630 LA070URD33KI0630 LA070URD33TTI0630
700 700 55 324 115 ⁄ 125 LA070URD33LI0700 LA070URD33KI0700 LA070URD33TTI0700
800 700 95 529 120 ⁄ 130 LA070URD33LI0800 LA070URD33KI0800 LA070URD33TTI0800
900 700 135 760 120 ⁄ 135 LA070URD33LI0900 LA070URD33KI0900 LA070URD33TTI0900
1000 700 170 970 135 ⁄ 155 LA070URD33LI1000 LA070URD33KI1000 LA070URD33TTI1000
33 1100 700 240 1360 135 ⁄ 160 LA070URD33LI1100 LA070URD33KI1100 LA070URD33TTI1100
1250 700 350 2000 150 ⁄ 180 LA070URD33LI1250 LA070URD33KI1250 LA070URD33TTI1250
1400 700 480 2700 160 ⁄ 200 LA070URD33LI1400 LA070URD33KI1400 LA070URD33TTI1400
1600 650 555 3250 210 ⁄ 240 LA065URD33LI1600 – LA065URD33TTI1600
1800 650 720 4330 225 ⁄ 260 LA065URD33LI1800 – LA065URD33TTI1800
2000 600 950 5000 250 ⁄ 290 LA060URD33LI2000 – LA060URD33TTI2000
2250 550 1250 5900 280 ⁄ 330 LA050URD33LI2250 – LA055URD33TTI2250
2500 500 1870 7600 280 ⁄ 330 LA050URD33LI2500 – LA050URD33TTI2500
** Watts loss data is published for both blade and tapped style mounting configurations.
When two watts loss values are shown, this represents tapped/blade values respectively.
Contact Littelfuse for characteristic curves.
Square Body Semiconductor Fuses
700/1300 VAC • Very Fast-Acting • 40 – 2500 Amperes
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Square Body Semiconductor Fuses
700/1300 VAC • Very Fast Acting • 40 – 2500 Amperes
1.93 MAX
[49]
2
[50.6]
A
B
C
A
.26
[6.7]
1.93 MAX
[49]
2
[50.6]
A
B
C
A
.26
[6.7]
North American Straight Blade, Type KI
Dimensions - 700V Fuses Dimensions for reference only.
Catalog Number Dimensions in Inches (mm in parentheses)
A B C D E F G H J
LA070URD30KI (63-550) 1.57
(40)
0.98
(25)
0.49
(12.5)
0.83
(21)
0.71
(18)
2.68
(68)
4.21
(107)
5.08
(129)
0.41
(10.5)
LA070URD31KI (200-800) 2.01
(51)
0.98
(25)
0.49
(12.5)
1.0
(25.5)
0.89
(22.5)
2.66
(67.6)
4.22
(107.1)
5.07
(128.8)
0.56
(14.3)
LA070URD32KI (400-1000) 2.36
(60)
1.26
(32)
0.63
(16)
1.18
(30)
1.06
(27)
2.92
(74.2)
4.29
(109)
5.28
(134)
0.57
(14.6)
LA070URD33KI (500-1400) 2.93
(74.5)
1.57
(40)
0.79
(20)
1.46
(37.2)
1.35
(34.2)
2.97
(75.4)
4.24
(107.6)
5.28
(134)
0.63
(15.9)
North American Straight Blade Types LI
Dimensions - 700V Fuses Dimensions for reference only.
Catalog Number Dimensions in Inches (mm in parentheses)
A B C D E F G H J
LA070URD30LI (63-550) 1.57
(40)
0.98
(25)
0.49
(12.5)
0.83
(21)
0.71
(18)
3.45
(87.6)
4.98
(126.6)
5.85
(148.6)
0.41
(10.5)
LA070URD31LI (200-800) 2.01
(51)
0.98
(25)
0.49
(12.5)
1.0
(25.5)
0.89
(22.5)
3.61
(91.6)
4.82
(122.4)
5.85
(148.6)
0.57
(14.6)
LA070URD32LI (400-1000)
LA065URD32LI (1250)
LA055URD32LI (1400-1600)
LA050URD32LI (1800)
2.36
(60)
1.26
(32)
0.63
(16)
1.18
(30)
1.06
(27)
3.71
(94.2)
5.08
(129)
6.02
(153)
0.57
(14.6)
LA070URD33LI (500-1400)
LA065URD33LI (1600-1800)
LA060URD33LI (2000)
LA055URD33LI (2250)
LA050URD33LI (2500)
2.93
(74.5)
1.57
(40)
0.79
(20)
1.46
(37.2)
1.35
(34.2)
3.72
(94.4)
4.98
(126.6)
6.02
(153)
0.63
(15.9)
North American Flat Single Hole, Type TTI
Dimensions - 700V Fuses Dimensions for reference only.)
Catalog Number Dimensions in Inches (mm in parentheses)
A B C
LA070URD30TTI (100-550) 1.57
(40)
1.00
(25)
5⁄16-18 x 0.35
LA070URD31TTI (200-800) 2.00
(50.8)
1.19
(30.2)
5⁄16-18 x 0.35
LA070URD32TTI (400-1000)
LA065URD32TTI (1100)
LA060URD32TTI (1250)
LA055URD32TTI (1400-1600)
2.37
(60.3)
1.50
(38.1)
3⁄8-16 x 0.35
LA060URD33TTI (1800)
LA070URD33TTI (500-1400)
LA065URD33TTI (1600)
LA060URD33TTI (2000)
LA055URD33TTI (2250)
LA050URD33TTI (2500)
2.94
(74.5)
1.81
(46)
1⁄2-18 x 0.35
TYPE TTI
TYPES KI AND LI
CB
F
G
H
J
1.925 MAX
[47.6]
D
A
E
A
.24
[6]
CB
F
G
H
J
1.925 MAX
[47.6]
D
A
E
A
.24
[6]
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105
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Square Body Semiconductor Fuses
700/1300 VAC • Very Fast Acting • 40 – 2500 Amperes
1300 Volt North American Style Ratings and Application Data
Body
Size Amp Rating Rated Voltage Melting I2t
(A2S x 103)
Total I2t @
Rated Voltage
(A2S x 103)
**Watts Loss @
Rated Current (W)
Long Blade
Catalog No. Type LI/LLI
Tapped Terminal
Catalog No. Type TTI
70
63 1300 0.21 1.8 26 LA130URD70LI0063 LA130URD70TTI0063
80 1300 0.47 4 27 LA130URD70LI0080 LA130URD70TTI0080
100 1300 0.83 7.2 30 LA130URD70LI0100 LA130URD70TTI0100
125 1300 1.3 11 38 LA130URD70LI0125 LA130URD70TTI0125
160 1300 2.5 22 45 LA130URD70LI0160 LA130URD70TTI0160
200 1300 4.7 40 54 ⁄ 56 LA130URD70LI0200 LA130URD70TTI0200
250 1300 9.6 82 58 ⁄ 61 LA130URD70LI0250 LA130URD70TTI0250
315 1300 20 172 66 ⁄ 72 LA130URD70LI0315 LA130URD70TTI0315
350 1200 28 205 68 ⁄ 75 LA120URD70LI0350 LA120URD70TTI0350
71
160 1300 2.6 22 46 LA130URD71IL0160 LA130URDT1TTI0160
200 1300 4.7 40 54 LA130URD71LLI0200 LA130URD71TTI0200
250 1300 8.9 76 61 LA130URD71LLI0250 LA130URD71TTI0250
280 1300 12 102 68 ⁄ 70 LA130URD71IL0280 LA130URD71TTI0280
315 1300 16 138 73 ⁄ 76 LA130URD71LLI0315 LA130URD71TTI0315
350 1300 22 190 76 ⁄ 80 LA130URD71LLI0350 LA130URD71TTI0350
400 1300 38 330 76 ⁄ 80 LA130URD71LLI0400 LA130URD71TTI0400
450 1300 47 405 87 ⁄ 95 LA130URD71LLI0450 LA130URD71TTI0450
500 1200 68 500 90 ⁄ 100 LA120URD71LLI0500 LA120URD71TTI0500
550 1200 84 620 98 ⁄ 112 LA120URD71LLI0550 LA120URD71TTI0550
630 1100 125 930 105 LA110URD71LLI0630 –
630 1200 125 930 120 – LA120URD71TTI0630
72
280 1300 10 90 72 LA130URD72LI0280 LA130URD72TTI0280
315 1300 15 130 76 LA130URD72LI0315 LA130URD72TTI0315
350 1300 21 180 77 LA130URD72LI0350 LA130URD72TTI0350
400 1300 32 285 80 LA130URD72LI0400 LA130URD72TTI0400
450 1300 44 380 87 ⁄ 89 LA130URD72LI0450 LA130URD72TTI0450
500 1300 57 500 94 ⁄ 98 LA130URD72LI0500 LA130URD72TTI0500
550 1300 68 590 110 ⁄ 120 LA130URD72LI0550 LA130URD72TTI0550
630 1200 105 920 113 LA120URD72LI0630 –
630 1300 105 920 125 – LA130URD72TTI0630
700 1100 145 1040 122 LA110URD72LI0700 -
700 1200 145 1040 140 – LA120URD72TTI0700
800 1100 215 1590 125 LA110URD72LI0800 –
800 1200 215 1590 146 – LA120URD72TTI0800
73
315 1300 12 102 84 LA130URD73LI0315 LA130URD73TTI0315
350 1300 17 150 86 LA130URD73LI0350 LA130URD73TTI0350
400 1300 25 220 93 LA130URD73LI0400 LA130URD73TTI0400
450 1300 35 310 99 ⁄ 100 LA130URD73LI0450 LA130URD73TTI0450
500 1300 44 390 110 ⁄ 112 LA130URD73LI0500 LA130URD73TTI0500
550 1300 57 500 116 ⁄ 120 LA130URD73LI0550 LA130URD73TTI0550
630 1300 84 730 125 ⁄ 132 LA130URD73LI0630 LA130URD73TTI0630
700 1300 110 960 135 ⁄ 146 LA130URD73LI0700 LA130URD73TTI0700
800 1200 190 1630 136 LA120URD73LI0800 –
800 1300 190 1630 148 – LA130URD73TTI0800
900 1100 250 2160 150 LA110URD73LI0900 –
900 1300 250 2160 170 – LA130URD73TTI0900
1000 1100 370 2430 152 ⁄ 174 LA100URD73LI1000 LA100URD73TTI1000
1100 1000 445 2580 168 ⁄ 208 LA100URD73LI1100 LA100URD73TTI1100
1250 1000 585 3480 186 ⁄ 200 LA100URD73LI1250 LA100URD73TTI1250
1400 900 755 3880 210 ⁄ 228 LA090URD73LI1400 LA090URD73TTI1400
1600 700 1430 5630 203 LA070URD73LI1600 LA070URD73TTI1600
1800 660 2040 7600 206 LA065URD73LI1800 LA065URD73TTI1800
** Watts loss data is published for both blade and tapped style mounting configurations.
When two watts loss values are shown, this represents tapped/blade values respectively.
Contact Littelfuse for characteristic curves.
Special Purpose Fuses
106 www.littelfuse.com
Special Purpose Fuses
© 2005 Littelfuse • POWR-GARD™ Products Catalog
Square Body Semiconductor Fuses
700/1300 VAC • Very Fast Acting • 40 – 2500 Amperes
2.85 MAX
[72.5]
2.91
[74]
A
B
A
C
0.2
[5.03]
North American Straight Blade, Types LI and LLI
Dimensions - 1300V Fuses Dimensions for reference only.
Catalog Number Dimensions In Inches (mm in parentheses)
A B C D E F G H J
LA130URD70LI (63-315)
LA120URD70LI (350)
1.57
(40)
0.98
(25)
0.49
(12.5)
0.83
(21)
0.71
(18)
3.60
(91.4)
5.13
(130.4)
6.00
(152.4)
0.41
(10.5)
LA130URD71LLI (160-450)
LA120URD71LLI (500-550)
LA110URD71LLI (630)
2.01
(51)
0.98
(25)
0.49
(12.5)
1.0
(26.5)
0.89
(22.5)
3.60
(91.4)
5.13
(130.4)
6.00
(152.4)
0.57
(14.6)
LA130URD72LI (280-550)
LA120URD72LI (800)
LA110URD72LI (700-800)
2.36
(60)
1.26
(32)
0.63
(16)
1.18
(30)
1.06
(27)
3.84
(97.6)
5.2
(132.4)
6.20
(157.4)
0.57
(14.6)
LA130URD73LI (315-700)
LA120URD73LI (800)
LA110URD73LI (900-1000)
LA090URD73LI (1400)
LA070URD73LI (1600)
LA065URD73LI (1800)
2.93
(74.5)
1.57
(40)
0.79
(20)
1.46
(37.2)
1.35
(34.2)
3.89
(98.8)
5.21
(132.4)
6.20
(157.4)
0.63
(15.9)
North American Flat Single Hole, Type TTI
Dimensions - 1300V Fuses Dimensions for reference only.
Catalog Number Dimensions in Inches (mm)
A B C
LA130URD70TTI (63-315)
LA120URD70TTI (350)
1.57
(40)
1.00
(26.4)
5⁄16-18 x 0.23 DP
LA130URD71TTI (160-450)
LA120URD71TTI (550-630)
2.01
(51)
1.19
(30.2)
5⁄16-18 x 0.36 DP
LA130URD72TTI (280-630)
LA120URD72TTI (700-800)
2.36
(60)
1.50
(38.1)
3⁄8-18 x 0.36 DP
LA130URD73TTI (315-900)
LA120URD73TTI (1000)
LA110URD73TTI (1250)
LA090URD73TTI (1400)
LA070URD73TTI (1600)
LA065URD73TTI (1800)
2.93
(74.5)
1.81
(46)
1⁄2-18 x 0.36 DP
TYPES LI AND LLI
TYPE TTI
J
2.85
[72.5]
F
G
H
B
C
A
D
E
A
0.2
[5.03]
