90
LA50QS Semiconductor Fuses
500 VAC
I
Very Fast-Acting
I
35 1200 Amperes
LA 50 QS 250 -4
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's
LA50QS series fuses were developed to improve the overall
performance of semiconductor fuses. The LA50QS provides
the best protection features including lower I
2
t, 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
I
Lowest I
2
t for greatest protection of semiconductor circuits.
I
Low watts loss for cooler operation.
I
Superior cycling ability gives an equipment design
advantage.
I
State-of-the-art protection for 500 volt equipment.
I
Ultra compact sizes allow down-sizing of existing equip-
ment.
APPLICATIONS
Protection of 500 volts or less solid state equipment such as
motor drives, UPS, inverters, etc.
ORDERING INFORMATION
Style
Littelfuse
Ampere Rating
Mounting T
ype
(Blades/Bolt-in)
V
oltage
(500)
NEW
35 100
4
3.63
1.00
2.13
2.94
2.75
0.31
0.75
0.13
(92.2)
(25.4)
(54.1)
(74.7)
(69.9)
(7.9)
(19.1)
(3.3)
125 200
4
3.63
1.22
2.13
2.94
2.81
0.31
1.00
0.19
(92.2)
(31.0)
(54.1)
(74.7)
(71.4)
(7.9)
(25.4)
(4.8)
225 400
4
4.34
1.50
2.09
3.41
2.78
.41
1.00
0.25
(110)
(38.1)
(53.1)
(86.6)
(70.6)
(10.4)
(25.4)
(6.4)
450 600
4
4.47
2.00
2.22
3.53
2.91
.41
1.50
0.25
(114)
(50.8)
(56.4)
(89.7)
(73.9)
(104)
(38.1)
(6.4)
700 800
4
6.47
2.50
2.22
5.00
3.44
.53
1.50
0.25
(164.3)
(63.5)
(56.4)
(127.0)
(87.3)
(13.5)
(38.1)
(6.4)
900 1200
4
6.97
3.00
3.22
5.47
4.47
.63
2.38
0.44
(177.0)
(76.2)
(81.8)
(138.9)
(113.5)
(15.9)
(60.3)
(11.1)
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
91
LA50QS Semiconductor Fuses
500 VAC
I
Very Fast-Acting
I
35 1200 Amperes
Ampere
Rating
Littelfuse
Catalog
Number
Catalog Numbers & Technical Data
Mounting
Type
Maximum
Clearing I
2
t
@500 VAC
(A
2
S x 10
3
)
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
Ampere
Rating
Littelfuse
Catalog
Number
Mounting
Type
Maximum
Clearing I
2
t
@500 VAC
(A
2
S x 10
3
)
Watts Loss
@ Rated
Current (W)
AMPERES
MOUNT.
TYPE
DIMENSIONS
Dimensions for reference only.
DIMENSIONS IN INCHES (mm in parentheses)
A
B
C
D
E
F
G
H
Contact Littelfuse for characteristic curves.
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