12/04
Semiconductor (A) fuses
Semiconductor (AC) fuses
SCAC24
American Round Fuses
Form 101 Range
A70QS
Semiconductor Protection Fuses
A70QS Amp-trap®Semiconductor Protection fuses were
developed in response to the need for improved overall
performance of 700 volt semiconductor fuses for new
equipment requirements. A70QS fuses have lower I2t for
better protection, longer life when subjected to cyclic
loading, plus lower watts loss. A70QS is the best choice
to protect dynamic solid state equipment
such as motor drives, UPS, etc.
• AC: 35-800A
700VAC, 200kA I.R.
• DC: 35-800A
700VDC, 100kA I.R.
L/R = 10ms
Ratings
Features/Benefits
• Very Low l2t for improved protection of equipment
• Superior cycling ability for long,reliable life
on high cyclic loading
• Low watts loss for cooler operation
• 700V AC/DC rating gives greater design versatility
• Ultra compact sizes allow down-sizing
of existing equipment
• UL Recognized
Component AC/DC
• AC: GuideNo.JFHR2
• DC: Tested to UL
Standard 198L
Parameters (35-800A)
• CSA Certified
File LR 12636
Approvals Highlights
• 700V AC/DC Rated
• Very low l2t
• Low Watts Loss
• Superior Cycling
Ability
Applications
• Protection of 700V
less motor drives,
UPS, inverters, etc.
Single Pole Fuse Blocks
for A70QS Fuses
Fuse Fuse block
Ampere Catalog Reference
Rating Number Number
35-200 P243C M219040
225-600 P266A Y212380
700-800 15C 375
A70 QS 150 - 4
Amp-trap®Fuse
Rated Volts - 700
Style
Amperes*
Mounting Types*
Blades, bolt-in.
Catalog Numbering System
A
70
QS
150
4,4K
* for ampere ratings and types not listed, consult the factory.
12/04
American Round Fuses
Form 101 Range
A70QS
SCAC25
Semiconductor (A) fuses
Semiconductor (AC) fuses
Semiconductor Protection Fuses
Load
700 VAC Fault
Fig. A
Load
700 VAC Fault
Fig. B
OPERATING VOLTAGE (AC RMS VOLTS)
CORRECTION FACTOR FOR I2T
Clearing I2t vs. AC Operating Voltage
For ampere ratings and styles not listed, ask sales agent. Mounting Type 4; note exception 4k
Standard Fuse Ampere Ratings, Catalog and ReferenceNumbers
Ampere Catalog Ref.
Rating Number Number
Dimensions
35 A7OQS35-4 D202748
40 A7OQS40-4 Y213829
50 A7OQS50-4 T217919
60 A7OQS60-4 H219473
70 A7OQS70-4 B201527
80 A7OQS80-4 X212816
90 A7OQS90-4 K214346
Ampere Catalog Ref.
Rating Number Number
100 A7OQS100-4 G214343
125 A7OQS125-4 L215865
125 A7OQS125-4K Q216375
150 A7OQS150-4 P218950
150 A7OQS150-4K F219471
175 A7OQS175-4 A223192
175 A7OQS175-4K J200982
Ampere Catalog Ref.
Rating Number Number
200 A7OQS200-4 V212814
200 A7OQS200-4K E213329
250 A7OQS250-4 L217406
300 A7OQS300-4 Q218951
350 A7OQS350-4 M211266
400 A7OQS400-4 J214345
450 A7OQS450-4 F214848
Ampere Catalog Ref.
Rating Number Number
450 A7OQS450-4K H215356
500 A7OQS500-4 A218431
500 A70QS500-4K R218952
600 A7OQS600-4 Y219993
600 A7OQS600-4K P222676
700 A7OQS700-4 E202772
800 A7OQS800-4 Z213830
35 0.13 0.47 0.27
40 0.16 0.58 0.33
50 0.24 0.86 0.49
60 0.32 1.2 0.69
70 0.50 1.8 1.0
80 0.65 2.3 1.3
90 0.83 3.0 1.7
100 1.0 3.6 2.1
125 2.1 6.9 4.0
150 3.3 11 6.3
175 4.2 14 8.0
200 5.9 19 11
225 9.0 30 17
250 12.6 42 24
300 16.7 55 32
350 21.5 72 41
400 29.7 99 57
450 36.7 125 72
500 47.1 160 92
600 65.2 222 127
700 103.6 332 190
800 135.3 433 248
Fuse
Ampere
Rating
I2t data
clearing at 700V AC
Melting
x 103A2s
1 Fuse
(Fig. A)
x 103A2s
2 Fuses
in series(Fig. B)
x 103A2s
I2t Data – 700 Volts
AC, 100kA
Catalog Mounting Dimensions - Inches (mm)
Number Type ABCD E F GH
A70QS35 to 100 4 4.38 1.00 2.88 3.69 3.50 0.31 0.75 0.13
(111) (25.4) (73.0) (93.6) (88.9) (7.9) (19.0) (3.2)
A70QS125 to 200 4 4.38 1.22 2.88 3.69 3.56 0.31 1.00 0.19
(111) (31.0) (73.0) (93.6) (90.5) (7.9) (25.4) (4.8)
A70QS125 to 200 4K 5.09 1.22 2.88 4.19 3.50 0.41 1.00 0.19
(129) (31.0) (73.0) (106) (88.0) (10.3) (25.4) (4.8)
A70QS225 to 400 4 5.09 1.50 2.84 4.16 3.53 0.40 1.50 0.25
(129) (38.1) (72.2) (106) (89.7) (10.3) (38.1) (6.4)
A70QS450 to 600 4 5.09 2.00 2.84 4.16 3.53 0.41 1.50 0.25
(129) (50.8) (72.2) (106) (89.7) (10.3) (38.1) (6.4)
A70QS450 to 600 4K 7.09 2.00 2.84 6.16 3.53 0.53 1.50 0.25
(180) (50.8) (72.2) (156) (89.7) (13.5) (38.1) (6.4)
A70QS700 to 800 4 7.09 2.50 2.84 5.28 4.91 0.53 2.00 0.38
(180) (63.5) (72.2) (134) (125) (13.5) (50.8) (9.5)
12/04
Semiconductor (A) fuses
Semiconductor (AC) fuses
SCAC26
American Round Fuses
Form 101 Range
A70QS
Semiconductor Protection Fuses
Melting Time – Current Data, 700V Fuses
TIME IN SECONDS
AVAILABLE CURRENT IN RMS SYMMETRICAL AMPERES
MAXIMUM INSTANTANEOUS PEAK LET-THRU AMPERES
A70QS35 to 800
CURRENT IN AMPERES
Peak Let-Thru Current Data – A70QS35 to 800, 700 Volts AC
12/04
American Round Fuses
Form 101 Range
A70QS
SCAC27
Semiconductor (A) fuses
Semiconductor (AC) fuses
Semiconductor Protection Fuses
Ampere Clearing I2t
Rating (A2s x 103)
35 0.25
40 0.35
50 0.60
70 1.3
80 1.8
90 2.4
100 3.1
125 5.3
150 8.1
175 12
200 16
225 21.5
250 27.5
300 42
350 63
400 85
450 115
500 150
600 201
700 325
800 450
Clearing I2t at 700V DC,
100kA, L/R = 10 ms
L/R TIME CONSTANT (MS)
DC Voltage Capability vs. Time Constant
DC VOLTAGE CAPABILITY
Maximum Arc Volts vs. System Voltage
PERCENT RATED CURRENT
CORRECTION FACTOR FOR WATTS LOSS
MAXIMUM PEAK ARC VOLTS
Watts Loss vs. % Rated Current
Watts Loss at Rated Current
CIRCUIT VOLTAGE (VOLTS RMS)
Ampere
Rating
Watts
Loss (W)
Ampere
Rating
Watts
Loss (W)
35 6.2 200 41
40 7.5 225 37
50 9.8 250 42
60 12 300 53
70 15 350 64
80 18 400 75
90 20 450 78
100 24 500 92
125 22 600 116
150 29 700 125
175 35 800 143
