Special Purpose Fuses
LA50QS Semiconductor Fuses
500 VAC • Very Fast Acting • 35 – 1200 Amperes
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 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
•
•
•
•
•
Lowest I
2
t 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
LA 50 QS 250 -4
Littelfuse
Special Purpose Fuses
Voltage
(500)
Style
Ampere Rating
Mounting Type
(Blades/Bolt-in)
Specifications
Voltage Rating:
Interrupting Rating:
Ampere Range:
Approvals:
AC: 500 volts
DC: 500 volts
AC: 200,000 Amperes
DC: 100,000 Amperes
35 – 1200 Amperes
UL Recognized under the components program
CSA Certified.
92
www.littelfuse.com
© 2005 Littelfuse
•
POWR-GARD
™
Products Catalog
Special Purpose Fuses
LA50QS Semiconductor Fuses
500 VAC • Very Fast Acting • 35 – 1200 Amperes
Catalog Numbers & Technical Data
Ampere
Rating
35
40
50
60
70
80
90
100
125
150
175
200
225
Littelfuse
Catalog
Number
LA50QS35-4
LA50QS40-4
LA50QS50-4
LA50QS60-4
LA50QS70-4
LA50QS80-4
LA50QS90-4
LA50QS100-4
LA50QS125-4
LA50QS150-4
LA50QS175-4
LA50QS200-4
LA50QS225-4
Maximum
Mounting
Clearing I
2
t @500
Type
VAC (A
2
S x 10
3
)
4
4
4
4
4
4
4
4
4
4
4
4
4
0.56
0.69
1.1
1.8
1.9
2.6
3.6
4.4
5.6
9
15
20
25
Watts Loss
@ Rated
Current (W)
6
7
8
10
12
14
15
17
21
25
29
33
37
Ampere
Rating
250
300
350
400
450
500
600
700
800
900
1000
1200
Littelfuse
Catalog
Number
LA50QS250-4
LA50QS300-4
LA50QS350-4
LA50QS400-4
LA50QS450-4
LA50QS500-4
LA50QS600-4
LA50QS700-4
LA50QS800-4
LA50QS900-4
LA50QS1000-4
LA50QS1200-4
Maximum
Mounting
Clearing I
2
t @500
Type
VAC (A
2
S x 10
3
)
4
4
4
4
4
4
4
4
4
4
4
4
29
55
88
98
130
160
220
270
360
500
560
930
Watts Loss
@ Rated
Current (W)
41
49
57
65
69
77
92
110
130
140
160
175
Special Purpose Fuses
Dimensions
Amperes
35 – 100
125 – 200
225 – 400
450 – 600
700 – 800
900 – 1200
Mount.
Type
4
4
4
4
4
4
Dimensions in Inches (mm in parentheses)
A
3.63
(92.2)
3.63
(92.2)
4.34
(110)
4.47
(114)
6.47
(164.3)
6.97
(177.0)
B
1.00
(25.4)
1.22
(31.0)
1.50
(38.1)
2.00
(50.8)
2.50
(63.5)
3.00
(76.2)
C
2.13
(54.1)
2.13
(54.1)
2.09
(53.1)
2.22
(56.4)
2.22
(56.4)
3.22
(81.8)
D
2.94
(74.7)
2.94
(74.7)
3.41
(86.6)
3.53
(89.7)
5.00
(127.0)
5.47
(138.9)
E
2.75
(69.9)
2.81
(71.4)
2.78
(70.6)
2.91
(73.9)
3.44
(87.3)
4.47
(113.5)
F
0.31
(7.9)
0.31
(7.9)
0.41
(10.4)
0.41
(10.4)
0.53
(13.5)
0.63
(15.9)
Dimensions for reference only.
G
0.75
(19.1)
1.00
(25.4)
1.00
(25.4)
1.50
(38.1)
1.50
(38.1)
2.38
(60.3)
H
0.13
(3.3)
0.19
(4.8)
0.25
(6.4)
0.25
(6.4)
0.25
(6.4)
0.44
(11.1)
Contact Littelfuse for characteristic curves.
© 2005 Littelfuse
•
POWR-GARD
™
Products Catalog
www.littelfuse.com
93
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