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®
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Rev: 4-E-012714
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Fuse Datasheet
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LA70QS ALTERNATE DIMENSION SEMICONDUCTOR FUSES
700 VAC/VDC • Very Fast-Acting • 35-800 A
AMPERE
RATING
CATALOG
NUMBER
MOUNTING
TYPE
MAXIMUM
CLEARING I
2
t
@700 VAC
(A
2
s X 10
3
)
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
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
Dimensions for reference only.
AMPERES
MOUNTING
TYPE
DIMENSIONS INCHES (mm)
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 (10 6) 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 (18 0) 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.
Description
Littelfuse LA70QS semiconductor fuses were developed
to provide improved performance required by today’s new
equipment. The LA70QS features lower I
2
t, improved cycling,
and lower watts loss. It is the best choice for the protection
of dynamic solid-state equipment.
Features/Benefits
• I
2
t 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
Specifications
Voltage Rating AC: 700 V
DC: 700 V
Interrupting Rating AC: 200 kA
DC: 100 kA
Ampere Range 35 – 800 A
Approvals UL Recognized
CSA Certified
Web Resources
For additional information, visit: littelfuse.com/la70qs
Dimensions
LA70QS Series Semiconductor Fuses
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