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®
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Rev: 4-E-012714
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Fuse Datasheet
5 of 8
LA50QS ALTERNATE DIMENSION SEMICONDUCTOR FUSES
500 VAC • Very Fast-Acting • 35-1200 A
Description
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.
Specifications
Voltage Rating AC: 500 V
DC: 500 V
Interrupting Rating AC: 200 kA
DC: 100 kA
Ampere Range 35 – 1200 A
Approvals UL Recognized
CSA Certified
Web Resources
For additional information, visit: littelfuse.com/la50qs
AMPERE
RATING
CATALOG
NUMBER
MOUNTING
TYPE
MAXIMUM
CLEARING I
2
t
@500 VAC
(A
2
s X 10
3
)
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
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 for reference only.
AMPERE
RATING
MOUNTING
TYPE
DIMENSIONS INCHES (mm)
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.
Dimensions
LA50QS Series
(1 pages)
(1 pages)
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