AMP-TRAP
®
–Form 101
A50QS
SEMICONDUCTOR PROTECTION FUSES
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 I
2
t 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.
Ratings
®
AC:
35-60A
500VAC, 200kA I.R.
70-1200A
500VAC, 200kA I.R.
®
DC:
35-1200A
500VDC, 100kA I.R.
Approvals
®
UL Recognized
Component
®
AC: UL Guide No. JFHR2
®
DC Tested to UL
Standard 198L
parameters (70-1200A)
®
CSA Certified
LR12636
Features / Benefits
®
Lowest l
2
t
for greatest protection of semiconductor
circuits
®
Low watts loss
for cooler operation
HIGHLIGHTS:
®
500V AC/DC Rated
®
Lowest l t
®
Low Watts Loss
®
Superior Cycling
2
APPLICATIONS:
®
Protection of 500V or
®
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
less motor drives,
UPS, inverters, etc.
Ability
Catalog Numbering System
Amp-trap
®
Fuse
Rated Volts - 500
A
50
QS
250
4
A 50 QS 250 - 4
Single Pole Fuse Blocks for A50QS Fuses
FUSE
AMPERE
RATING
1 - 30
35-200
225-600
FUSE BLOCK
MOUNTING
CATALOG
TYPE
NUMBER
4
4
P243E
P266C
Style
Amperes*
Mounting Type*
Blades, bolt-in
* For ampere ratings and types not listed, consult the factory.
D 12
AMP-TRAP
®
–Form 101
A50QS
AMPERE
RATING
35
40
50
60
70
80
90
100
125
150
175
200
225
CATALOG
NUMBER
A50QS35-4
A50QS40-4
A50QS50-4
A50QS60-4
A50QS70-4
A50QS80-4
A50QS90-4
A50QS100-4
A50QS125-4
A50QS150-4
A50QS175-4
A50QS200-4
A50QS225-4
AMPERE
RATING
250
300
350
400
450
500
600
700
800
900
1000
1200
SEMICONDUCTOR PROTECTION FUSES
CATALOG
NUMBER
A50QS250-4
A50QS300-4
A50QS350-4
A50QS400-4
A50QS450-4
A50QS500-4
A50QS600-4
A50QS700-4
A50QS800-4
A50QS900-4
A50QS1000-4
A50QS1200-4
Standard Fuse Ampere Ratings, Catalog Numbers
For ampere ratings and styles not listed, call Technical Services.
D
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)
DIMENSIONS - INCHES (mm)
D
E
2.94
(74.7)
2.94
(74.7)
3.41
(86.6)
3.53
(89.7)
5.00
(127.0)
5.47
(138.9)
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)
.53
(13.5)
.63
(15.9)
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)
.25
(6.4)
.44
(11.1)
Dimensions
CATALOG
NUMBER
A50QS35 to 100
A50QS125 to 200
A50QS225 to 400
A50QS450 to 600
A50QS700 to 800
A50QS900 to 1200
MOUNTING
TYPE
4
4
4
4
4
4
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)
Watts Loss vs. Percent Rated Current
Watts Loss at Rated Current
AMPERE
RATING
WATTS
LOSS(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
WATTS
LOSS(w)
41
49
57
65
69
77
92
110
130
140
160
175
Correction Factor for Watts Loss
35
40
50
60
70
80
90
100
125
150
175
200
225
Correction factor example: At 80% rated current, watts
loss equals .54 times watts loss at rated current.
Percent Rated Current
D 13
AMP-TRAP
®
–Form 101
A50QS
SEMICONDUCTOR PROTECTION FUSES
A50QS35 to 1200
Melting Time – Current Data, 500V Fuses
Time in Seconds
Current in Amperes
Peak Let-Thru Current Data – A50QS35 to 1200, 500 Volts AC
Maximum Instantaneous Peak Let-Thru Amperes
Maximum Arc Volts vs. System Voltage
Maximum Peak Arc Volts
Circuit Voltage (Volts RMS)
Available Current in RMS Symmetrical Amperes
D 14
AMP-TRAP
®
–Form 101
A50QS
I
2
t Data – 500 Volts AC
I
2
t DATA
FUSE
MAX. CLEARING I
2
t @ 500VAC
AMPERE MELTING I
2
t 1 FUSE
(Fig A)
2 FUSES IN SERIES
RATING
35
40
50
60
70
80
90
100
125
150
175
200
225
250
300
350
400
450
500
600
700
800
900
1000
1200
(A
2
s x 10
3
)
.09
.11
.18
.25
.31
.43
.57
.74
.94
1.5
2.5
3.3
4.1
4.9
9.2
15
16
21
26
37
53
72
98
112
200
(A
2
s x 10
3
)
.56
.69
1.1
1.6
1.9
2.6
3.6
4.4
5.6
9
15
20
25
29
55
88
98
130
160
220
270
360
500
560
930
(A
2
s x 10
3
)
(Fig B)
.34
.4
.68
.94
1.1
1.5
2.1
2.7
3.4
5.4
9
12
15
18
33
53
59
76
94
130
160
220
300
330
550
SEMICONDUCTOR PROTECTION FUSES
500 VAC
Fault
Load
500 VAC
Fault
Load
Fig. A
Fig. B
Clearing I
2
t vs. AC Operating Voltage
Correction Factor for I t
D
2
Operating Voltage (AC RMS Volts)
Clearing I
2
t at 500V DC, 100kA, L/R = 10 ms
AMPERE
RATING
35
40
50
60
70
80
90
100
125
150
175
200
225
CLEARING I
2
t
(A
2
s x 10
3
)
.48
.58
1.0
1.3
1.6
2.2
3.0
3.8
4.8
7.7
13
17
21
AMPERE
RATING
250
300
350
400
450
500
600
700
800
900
1000
1200
CLEARING I
2
t
(A
2
s x 10
3
)
25
47
75
83
110
130
190
220
260
350
430
660
DC Voltage Capability vs. Time Constant
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.
DC Voltage Capability
L/R Time Constant (ms)
D 15
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