High Speed Fuses
North American — FWX 250V: 35-2500A
FWX
Arc Voltage
This curve gives the peak
arc voltage, UL, which may
appear across the fuse
during its operation as a
function of the applied
working voltage, Eg, (rms)
at a power factor of 15%.
Specifications
Description: North American
style stud-mount and flush-end
fuses.
Dimensions: See Dimensions
illustrations.
Ratings:
Volts: — 250Vac/dc
Amps: — 35-2500A
IR: — 200kA RMS Sym.
Agency Information: CE, UL Recognized & CSA
Component Acceptance on 35-800A fuses (20kA IR
@250Vdc).
Power Losses
Watts loss at rated current is
given in the electrical char
acteristics. The curve allows
the calculation of the power
losses at load currents lower
than the rated current . The
correction factor, K p , is
given as a function of the
RMS load current, Ib , in %
of the rated current .
1.5
Electrical
Characteristics
K
1.0
Total Clearing I t
2
The total clearing I2t at rated
voltage and at power factor
of 15% are given in the
electrical characteristics.
For other voltages, the
clearing I2t is found by
multiplying by correction
factor, K, given as a
function of applied working
voltage, Eg, (rms).
0.5
1)
0.3
0.2
Eg
0.15
Fig. 1:
35-800A
D
2.59
2.44
2.94
3.03
—
1.50
75
125
200
250
300
1) 35-800A Range
2) 1000-2500A Range
E
2.25
2.19
2.25
2.28
—
—
F
0.34
0.34
0.41
0.41
—
—
G
0.63
1.00
1.00
1.50
—
—
Fig. 2:
1000-1200A
H
0.13
0.19
0.25
0.25
—
—
J
0.52
0.47
0.75
0.78
—
—
Tapped
Thread
Depth
—
—
—
—
3
⁄8”-24 x 1⁄2”
3
⁄8”--24 x 1⁄2”
Fig. 3:
1500-2500A
J
A
A
A D E C
D
B
F
G
800
600
500
400
Catalog
Number
FWX-35A
FWX-40A
FWX-45A
FWX-50A
FWX-60A
FWX-70A
FWX-80A
FWX-90A
FWX-100A
FWX-125A
FWX-150A
FWX-175A
FWX-200A
FWX-225A
FWX-250A
FWX-275A
FWX-300A
FWX-350A
FWX-400A
FWX-450A
FWX-500A
FWX-600A
FWX-700A
FWX-800A
FWX-1000AH
FWX-1200AH
FWX-1500AH
FWX-1600AH
FWX-2000AH
FWX-2500AH
Rated
Current
RMS-Amps
35
40
45
50
60
70
80
90
100
125
150
175
200
225
250
275
300
350
400
450
500
600
700
800
1000
1200
1500
1600
2000
2500
C
C
102
2)
Eg
200
50
100
150
200
250
1) 35-800A Range
2) 1000-2500A Range
1.0
Kp
0.8
0.6
0.5
0.4
0.3
0.2
Ib
0.1
60
Electrical Characteristics
I2t (A2 Sec)
Clearing
Pre-arc
at 250V
50
230
60
310
80
390
100
520
140
740
330
1400
430
1850
570
2450
740
3150
1130
4850
1620
6950
2170
9300
2790
12000
3210
14700
3960
18100
4720
21600
6000
27300
10600
48600
14500
66100
22100
101000
28000
128000
41100
188000
48800
190000
59000
230000
44000
360000
92000
750000
120000
880000
160000
1200000
320000
2300000
670000
4700000
70
80 90 100%
Watts
Loss
4.2
5.2
5.7
6.0
8.1
7.2
8.1
9.0
10.0
12.5
15.7
18.5
22
24
27
31
32
39
44
49
54
62
72
84
100
103
140
140
151
163
• See accessories on page 113.
Features and Benefits
• Excellent DC performance
• Low arc voltage and low
energy let-through (I2t)
• Superior cycling capability
•
•
•
•
Typical Applications
DC common bus
DC drives
Power converters/rectifiers
Reduced voltage starters
H
B
1)
300
30 40 50
• Watts loss provided at rated current.
B
UL
103
Catalog Numbers
2)
Dimensions (in)
Amp
Rang e
Fig. A
B
C
35-60
1
3.19 0.81 1.59
70-200
1
3.13 1.22 1.59
225-600
1
3.84 1.50 1.59
700-800
1
3.84 2.00 1.59
1000-1200
2
2.59 3.00 1.50
1500-2500
3
2.59 3.50 1.50
1mm = 0.0394” / 1” = 25.4mm
1.4
1.2
Data Sheet: 720005
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
High Speed Fuses
North American — FWX 250V: 35-2500A
FWX 35-800A: 250V
FWX 1000-2500A(H): 250V
Time-Current Curve
Time-Current Curve
104
6
4
104
2
103
3
10
FWX-200A
FWX-350A
FXW-400A
FWX-500A
FWX-600A
FWX-800A
6
4
2
FWX-1000AH
FWX-1200AH
FWX-1500AH
FWX-1600AH
FWX-2000AH
FWX-2500AH
2
10
101
6
4
2
Virtual Pre-Arcing Time In Seconds
100
FWX-35A
FWX-40A
FWX-60A
FWX-70A
FWX-100A
FWX-150A
10–1
10–2
10–3
10–4
102
2
103
Prospective Current In Amps RMS
104
1
High Speed
Fuses
Virtual Pre-arcing Time In Seconds
102
10
6
4
2
100
6
4
2
10–1
6
4
2
10–2
6
4
Peak Let-Through Curve
2
105
10–3
6
4
B
2
FWX-800A
FWX-600A
FWX-400A
FWX-300A
FWX-200A
10–4
2
103
4
6 8
2
4
6
104
Prospective Current In Amps RMS
8
105
Peak Let-Through Current
104
Peak Let-Through Curve
105
6
FWX-2500AH
4
103
A
Peak Let-Through Current
FWX-150A
FWX-100A
FWX-70A
FWX-60A
FWX-45A
FWX-35A
FWX-2000AH
FWX-1600AH
FWX-1500AH
FWX-1200AH
2
FWX-1000AH
104
6
4
102
102
103
104
105
Prospective Short-Circuit Current Symmetrical RMS
2
103
103
2
4
6
104
2
4
6
105
2
4
6
Prospective Short-Circuit Current Symmetrical RMS
Data Sheet: 359
Data Sheet: 35785299
For product data sheets, visit www.cooperbussmann.com/datasheets/ulcsa
103