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➤AC: 35-60A
500VAC, 200kA I.R.
70-1200A
500VAC, 200kA I.R.
➤DC: 35-1200A
500VDC, 100kA I.R.
Ratings
A50QS Amp-trap® Form 101 fuses grew out of the
need to improve the overall performance of
semiconductor fuses in response to new equipment
requirements. The A50QS encompasses the best
protection features – lower I2t to provide better
protection for equipment, longer life when subjected
to cyclic loading and lower watts loss. A50QS is
today’s best choice for the protection of dynamic
solid state equipment such as motor drives,
inverters, UPS, etc.
➤UL Recognized
Component
➤AC: UL Guide No. JFHR2
➤DC Tested to UL
Standard 198L
parameters (70-1200A)
➤CSA Certified
LR12636
Approvals
A50 QS 250 - 4
Amp-trap®Fuse
Rated Volts - 500
Style
Amperes*
Mounting Type*
Blades, bolt-in
* For ampere ratings and types not listed, consult the factory.
Catalog Numbering System
A
50
QS
250
4
FUSE FUSE BLOCK
AMPERE MOUNTING CATALOG
RATING TYPE NUMBER
1 - 30
35-200 4 P243E
225-600 4 P266C
Single Pole Fuse Blocks for A50QS Fuses
Features/Benefits
➤Lowest l2tfor 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
HIGHLIGHTS:
➤500V AC/DC Rated
➤Lowest l2t
➤Low Watts Loss
➤Superior Cycling
Ability
APPLICATIONS:
➤Protection of 500V or
less motor drives,
UPS, inverters, etc.
AMP-TRAP®–Form 101
A50QS SEMICONDUCTOR PROTECTION FUSES
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AMPERE CATALOG AMPERE CATALOG
RATING NUMBER RATING NUMBER
35 A50QS35-4 250 A50QS250-4
40 A50QS40-4 300 A50QS300-4
50 A50QS50-4 350 A50QS350-4
60 A50QS60-4 400 A50QS400-4
70 A50QS70-4 450 A50QS450-4
80 A50QS80-4 500 A50QS500-4
90 A50QS90-4 600 A50QS600-4
100 A50QS100-4 700 A50QS700-4
125 A50QS125-4 800 A50QS800-4
150 A50QS150-4 900 A50QS900-4
175 A50QS175-4 1000 A50QS1000-4
200 A50QS200-4 1200 A50QS1200-4
225 A50QS225-4
Standard Fuse Ampere Ratings, Catalog Numbers
For ampere ratings and styles not listed, call Technical Services.
Dimensions
CATALOG MOUNTING DIMENSIONS - INCHES (mm)
NUMBER TYPE A B C D E F G H
A50QS35 to 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)
A50QS125 to 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)
A50QS225 to 400 4 4.34 1.50 2.09 3.41 2.78 0.41 1.00 0.25
(110) (38.1) (53.1) (86.6) (70.6) (10.4) (25.4) (6.4)
A50QS450 to 600 4 4.47 2.00 2.22 3.53 2.91 0.41 1.50 0.25
(114) (50.8) (56.4) (89.7) (73.9) (10.4) (38.1) (6.4)
A50QS700 to 800 4 6.47 2.50 2.22 5.00 3.44 .53 1.50 .25
(164.3) (63.5) (56.4) (127.0) (87.3) (13.5) (38.1) (6.4)
A50QS900 to 1200 4 6.97 3.00 3.22 5.47 4.47 .63 2.38 .44
(177.0) (76.2) (81.8) (138.9) (113.5) (15.9) (60.3) (11.1)
Percent Rated Current
Correction Factor for Watts Loss
Watts Loss vs. Percent Rated Current
AMPERE WATTS
RATING LOSS(w)
35 6
40 7
50 8
60 10
70 12
80 14
90 15
100 17
125 21
150 25
175 29
200 33
225 37
AMPERE WATTS
RATING LOSS(w)
250 41
300 49
350 57
400 65
450 69
500 77
600 92
700 110
800 130
900 140
1000 160
1200 175
Watts Loss at Rated Current
Correction factor example: At 80% rated current, watts
loss equals .54 times watts loss at rated current.
AMP-TRAP®–Form 101
A50QS SEMICONDUCTOR PROTECTION FUSES
http://store.iiic.cc/
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A50QS35 to 1200
Circuit Voltage (Volts RMS)
Maximum Peak Arc Volts
Maximum Arc Volts vs. System Voltage
Melting Time – Current Data, 500V Fuses
Available Current in RMS Symmetrical Amperes
Maximum Instantaneous Peak Let-Thru Amperes
Peak Let-Thru Current Data – A50QS35 to 1200, 500 Volts AC
AMP-TRAP®–Form 101
A50QS SEMICONDUCTOR PROTECTION FUSES
Time in Seconds
Current in Amperes
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Operating Voltage (AC RMS Volts)
Correction Factor for I2t
Clearing I2t vs. AC Operating Voltage
I2t DATA
FUSE MAX. CLEARING I2t @ 500VAC
AMPERE MELTING I2t 1 FUSE (Fig A) 2 FUSES IN SERIES
RATING (A2s x 103)(A
2s x 103)(A
2s x 103)(Fig B)
35 .09 .56 .34
40 .11 .69 .4
50 .18 1.1 .68
60 .25 1.6 .94
70 .31 1.9 1.1
80 .43 2.6 1.5
90 .57 3.6 2.1
100 .74 4.4 2.7
125 .94 5.6 3.4
150 1.5 9 5.4
175 2.5 15 9
200 3.3 20 12
225 4.1 25 15
250 4.9 29 18
300 9.2 55 33
350 15 88 53
400 16 98 59
450 21 130 76
500 26 160 94
600 37 220 130
700 53 270 160
800 72 360 220
900 98 500 300
1000 112 560 330
1200 200 930 550
Load
500 VAC Fault
Fig. A
Load
500 VAC Fault
Fig. B
AMPERE CLEARING I2tAMPERE CLEARING I2t
RATING (A2s x 103) RATING (A2s x 103)
35 .48 250 25
40 .58 300 47
50 1.0 350 75
60 1.3 400 83
70 1.6 450 110
80 2.2 500 130
90 3.0 600 190
100 3.8 700 220
125 4.8 800 260
150 7.7 900 350
175 13 1000 430
200 17 1200 660
225 21
Clearing I2t at 500V DC, 100kA, L/R = 10 ms
DC Application: A50QS Fuses have been designed for both AC
and DC operation. A50QS fuses (70-600) have UL Component
Recognition at 500V DC and have been tested to circuit parameters
as defined in Standard 198L.
L/R Time Constant (ms)
DC Voltage Capability vs. Time Constant
DC Voltage Capability
AMP-TRAP®–Form 101
A50QS SEMICONDUCTOR PROTECTION FUSES
I2t Data – 500 Volts AC
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