High Speed Fuses
Ferrule — FWX 250V (UL): 1-50A
FWX (14 x 51mm)
Specifications
Description:
Ferrule style high
speed fuses.
Dimensions:
See Dimensions
illustration.
Ratings:
Volts: — 250Vac
Amps: — 1-50A
IR: — 200kA RMS Sym.
— 50kA @ 250Vdc
Agency Information:
CE, UL Recognition 1-50A & CSA
Component Acceptance: 5-30A
Electrical
Characteristics
1.0
1.5
K
Arc Voltage
This curve gives the
peak arc voltage, UL,
which may appear
across the fuse during
its operation as a func-
tion of the applied work-
ing voltage, Eg, (rms) at
a power factor of 15%.
Power Losses
Watts loss at rated current
is given in the electrical
characteristics. The curve
allows the calculation of
the power losses at load
currents lower than the
rated current. The
correction factor, Kp, is
given as a function of the
RMS load current, Ib, in %
of the rated current.
Catalog Numbers
E
g
75
125
200
250
300
Catalog
Number
FWX-1A14F
FWX-2A14F
FWX-3A14F
FWX-4A14F
FWX-5A14F
FWX-10A14F
FWX-15A14F
FWX-20A14F
FWX-25A14F
FWX-30A14F
FWX-50A14F
1.4
1.2
10
3
800
600
500
400
300
200
50
U
L
1)
2)
E
g
100
150
200
250
1.0
K
p
0.8
0.6
0.5
0.4
0.3
0.2
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 multiplying by
correction factor, K, given
as a function of applied
working voltage, Eg, (rms).
0.5
0.3
0.2
0.15
1)
2)
0.1
30 40 50
60
70
I
b
80 90 100%
Size
14 x 51mm
(
9
⁄
16
” x 2”)
Dimensions - mm (inches)
50.8
(2.000")
14.3
(0.563")
Electrical Characteristics
Rated
I2t (A2 Sec)
Current
Clearing
RMS-Amps
Pre-arc
at 250V
1
—
—
2
—
—
3
—
—
4
—
—
5
1.6
13
10
3.6
24
15
14
83
20
33
200
25
58
300
30
100
500
50
200
1800
Watts
Loss
—
—
—
—
1.3
3.4
3.8
4.6
5.3
5.9
5.7
• Watts loss provided at rated current.
• (250Vdc/Interrupting rating 50kA) UL Recognition & CSA Component Acceptance on 5
through 30A only. Consult Cooper Bussmann for additional ratings.
• See accessories on page 211.
15.5
(0.610")
Features and Benefits
• Excellent cycling capability and dc performance
• Low arc voltage and low energy let-through (I
2
t)
• Low watts loss in a compact size
• Used with finger-safe holders/blocks
Typical Applications
• DC common bus
• DC drives
• Power converters/rectifiers
• Reduced voltage starters
194
For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp
High Speed Fuses
Ferrule — FWX 250V (UL): 1-50A
FWX 1-30A: 250V (14 x 51mm)
Time-Current Curve
Did You Know?
All-Inclusive Elevator Disconnect
Simplifies Installation Plus a
Multitude of Codes and Standards
When the Westin
Hotel chain reno-
vated the historic
Cupples Station in
downtown St.
Louis, the hotel’s
design-and-build
electrical contrac-
tor specified the
Cooper
®
Power Module™ elevator shunt trip
Bussmann
disconnect. The primary reason was the savings in
man-hours with everything in one box: the fire alarm,
control wiring and power wiring; all the parts needed
to interface with a fire alarm system in a UL 98
Listed assembly. In addition, all the codes and
standards surrounding the elevator disconnecting
means – electrical, elevator, fire alarm and the
sprinkler
system – are met, including ANSI/ASME A17.1,
NFPA 72, NEC
®
620.62.
The contractor faced a unique situation when the
luxury hotel chain chose to revamp the old
warehouse versus tearing the structure down and
rebuilding. The hotel complex consists of four
buildings interconnected with walkways. A total of
eight elevators were installed with eight Power
Module switches, two per building. Each 30 HP
passenger elevator is fused with Cooper Bussmann
®
Low-Peak
®
Class J LPJ-70SP fuses while each
40HP service elevator uses the Class J
LPJ-90SP fuses.
High Speed
Fuses
Peak Let-Through Curve
Data Sheet: 35785302
For product data sheets, visit www.cooperbussmann.com/products/datasheet.asp
195
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