High Speed Fuses
North American — FWX 250V: 35-2500A
FWX
Specifications
Description:
North American
style stud-mount and flush-end
fuses.
Dimensions:
See Dimensions
illustrations.
Ratings:
Volts: — 250Vac
Amps: — 35-2500A
IR: — 200kA RMS Sym.
Agency Information:
CE, UL Recognized & CSA
Component Acceptance on 35-800A fuses (20kA IR
@250Vdc).
Electrical
Characteristics
Total Clearing I
2
t
The total clearing I
2
t at rated
voltage and at power factor
of 15% are given in the
electrical characteristics.
For other voltages, the
clearing I
2
t is found by multi-
plying by correction factor,
K, given as a function of
applied working voltage, Eg,
(rms).
Dimensions (in)
Amp
Range
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
D
2.59
2.44
2.94
3.03
—
1.50
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
—
—
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
”
0.5
0.3
0.2
0.15
75
125
200
250
1) 35-800A Range
2) 1000-2500A Range
Arc Voltage
This curve gives the peak
arc voltage, UL, which may
appear across the fuse dur-
ing its operation as a func-
tion of the applied working
voltage, Eg, (rms) at a
power factor of 15%.
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 .
Catalog Numbers
2)
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
1.4
1.2
10
3
800
600
500
400
300
200
50
U
L
1)
2)
E
g
100
150
200
250
1) 35-800A Range
2) 1000-2500A Range
1.0
K
p
0.8
0.6
0.5
0.4
0.3
0.2
High Speed
Fuses
1.5
K
1.0
1)
0.1
30 40 50
60
70
I
b
80 90 100%
E
g
300
Fig. 1:
35-800A
J
Fig. 2:
1000-1200A
A
A
Fig. 3:
1500-2500A
A D E C
D
Electrical Characteristics
I
2
t (A
2
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
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
• Watts loss provided at rated current.
B
B
C
C
• See accessories on page 106.
F
G
Features and Benefits
• Excellent dc performance
• Low arc voltage and low
energy let-through (I
2
t)
• Superior cycling capability
Typical Applications
• DC common bus
• DC drives
• Power converters/rectifiers
• Reduced voltage starters
H
B
For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp
95
COOPER [ COOPER BUSSMANN, INC. ]
