Bussmann
Ferrule
®
FWX 250V (U.L.)
1-30A
Ordering Information
Watts
Loss
Part
Number
Carton
Qty.
Carton
Weight
(kg)
Dimensions
Figure
Number
®
Size
Electrical Characteristics
I
2
t (A
2
S)
Rated
Current
Clearing
RMS-Amps
Pre-arc
at 250V
Curves
BIF #
1
—
—
—
FWX-1A14F
2
—
—
—
FWX-2A14F
3
—
—
—
FWX-3A14F
4
—
—
—
FWX-4A14F
14 ≈ 51mm
5
1.6
13
1.3
FWX-5A14F
10
0.225
Fig. 1
35785302
(·Ω¡§∑)
10
3.6
24
3.4
FWX-10A14F
15
14
83
3.8
FWX-15A14F
20
33
200
4.6
FWX-20A14F
25
58
300
5.3
FWX-25A14F
30
100
500
5.9
FWX-30A14F
50
200
1800
5.7
FWX-50A14F
Interrupting rating 200kA RMS Symmetrical.
1 kg = 2.2 lbs. 1 lb = 0.45 kg
Watts loss provided at rated current.
(250 Vdc/Interrupting rating 50kA) U.L. Recognition on 5 through 30 amperes only. Consult Bussmann for additional ratings.
See accessories on page 90.
Dimensions
Fig. 1: 1-30 Amp Range
50.8
(2.000")
14.3
(0.563")
Dimension in mm.
1mm = 0.0394∑
1∑ = 25.4mm
15.5
(0.610")
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 volt-
ages, the clearing I
2
t is found by multi-
plying by correction factor, K, given as
a function of applied working voltage,
E
g
, (RMS).
1.5
K
1.0
Arc Voltage
This curve gives the peak arc voltage,
U
L
, which may appear across the fuse
during its operation as a function of the
applied working voltage, E
g
, (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, K
p
,
is given as a function of the RMS load
current, I
b
, in % of the rated current .
1.0
K
p
0.8
0.6
0.5
0.4
0.3
0.2
1.4
1.2
10
3
800
U
L
0.5
0.3
0.2
0.15
75
125
200
250
E
g
300
600
500
400
300
200
50
100
150
200
E
g
250V
RMS
0.1
30 40 50
I
b
60
70
80 90 100%
7-18-01
SB01191
The only controlled copy of this BIF document is the electronic read-only version located on the
Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bulletin
is intended to clearly present comprehensive product data and provide technical information that will
help the end user with design applications. Bussmann reserves the right, without notice, to change
design or construction of any products and to discontinue or limit distribution of any products.
Bussmann also reserves the right to change or update, without notice, any technical information con-
tained in this bulletin. Once a product has been selected, it should be tested by the user in all possible
applications.
Form No.
Page 1 of 1
BIF Doc #720006
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