High Speed Fuses
North American — FWX 250V: 35-2500A
Arc Voltage
FWX
1.4
1.2
103
UL
This curve gives the peak
arc voltage, U , which may
appear across the fuse dur-
ing its operation as a func-
tion of the applied working
Specifications
L
Description: North American
style stud-mount and flush-end
fuses.
800
600
500
Dimensions: See Dimensions
illustrations.
voltage, E , (rms) at a
400
300
g
1)
power factor of 15%.
Ratings:
2)
Eg
Power Losses
Volts:— 250Vac
Amps:— 35-2500A
IR:— 200kA RMS Sym.
200
50
100
150
200
250
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 , is
given as a function of the
RMS load current, I , in %
of the rated current.
1) 35-800A Range
2) 1000-2500A Range
1.0
0.8
Kp
Agency Information: CE, UL Recognized & CSA
Component Acceptance on 35-800A fuses (20kA IR
@250Vdc).
0.6
0.5
0.4
0.3
Electrical
1.5
p
K
Characteristics
0.2
1.0
Total Clearing I2t
b
Ib
80 90 100%
0.1
2
1)
The total clearing I t at rated
0.5
30 40 50 60
70
Catalog Numbers
voltage and at power factor
of 15% are given in the
electrical characteristics.
Electrical Characteristics
I2t (A2 Sec)
2)
Rated
Current
RMS-Amps
35
0.3
Catalog
Number
FWX-35A
FWX-40A
Clearing Watts
at 250V
0.2
Pre-arc
50
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
For other voltages, the
230
310
390
520
740
1400
1850
2450
3150
4850
6950
9300
2
Eg
300
clearing I t is found by multi-
plying by correction factor,
K, given as a function of
0.15
40
45
50
60
70
80
90
100
125
150
175
200
225
250
275
300
350
400
450
500
600
700
800
60
80
100
140
330
430
570
740
75 125
200 250
FWX-45A
FWX-50A
FWX-60A
FWX-70A
FWX-80A
FWX-90A
1) 35-800A Range
2) 1000-2500A Range
applied working voltage, E ,
g
(rms).
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
Dimensions (in)
Tapped
Thread
Depth
1130
1620
2170
2790
3210
3960
4720
6000
10600
14500
22100
28000
41100
48800
59000
44000
92000
120000
160000
320000
670000
Amp
Range
35-60
70-200
225-600
700-800
1000-1200
1500-2500
Fig. A
B
C
D
E
F
G
H
J
1
1
1
1
2
3
3.19 0.81 1.59 2.59 2.25 0.34 0.63 0.13 0.52 —
3.13 1.22 1.59 2.44 2.19 0.34 1.00 0.19 0.47 —
3.84 1.50 1.59 2.94 2.25 0.41 1.00 0.25 0.75 —
3.84 2.00 1.59 3.03 2.28 0.41 1.50 0.25 0.78 —
2.59 3.00 1.50 —
12000
14700
18100
21600
27300
48600
66100
101000
128000
188000
190000
230000
360000
750000
880000
1200000
2300000
4700000
3
1
2
—
—
—
—
—
—
—
—
—
⁄
8
8
”-24 x ⁄
”
1
2
3
2.59 3.50 1.50 1.50 —
⁄ ”--24 x ⁄ ”
1mm = 0.0394” / 1” = 25.4mm
Fig. 1:
Fig. 2:
1000-1200A
Fig. 3:
35-800A
1500-2500A
J
1000
1200
1500
1600
2000
2500
A
A
D
E C
A
D
• Watts loss provided at rated current. • See accessories on page 106.
C
B
Typical Applications
• DC common bus
• DC drives
• Power converters/rectifiers
• Reduced voltage starters
Features and Benefits
• Excellent dc performance
• Low arc voltage and low
energy let-through (I t)
• Superior cycling capability
C
B
F
G
2
H
B
For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp
95
COOPER [ COOPER BUSSMANN, INC. ]
