• The heat energy of even low-level fault currents can quickly
destroy a semiconductor device.
* Buss FW type fuse limits peak let-thru current to a level
which is a fraction of the potential available short-circuit peak
current.
• Fast speed-of-response to build-up of short-circuit current
and the quickly decaying short-circuit current as the fuse
suppresses internal arcing together can limit the I
2
t let-thru to
values substantially lower than the I
2
t withstand of the semi-
conductor device.
Current Rating.
• Current rating is given in AC (rms) for an ambient tempera-
ture of 20ºC (68ºF).
• Although these fuses can be operated at 100% of rating,
good design practice dictates some derating (i.e. for ambient
temperature), typically this is 20%.
Voltage Rating.
• Rated voltage of Semiconductor fuses is given in terms of
A.C. operation, 60Hz.
• When used in D.C. circuits no voltage derating is required
provided the minimum interrupting capability is eight times
the fuse rating and the time constant does not exceed those
specified in U.L. 198L.
Total Clearing I
2
t.
• Maximum values of total clearing I
2
t are obtained at the rated
A.C. voltage, an arcing angle between 60º and 90º, at an
available symmetrical rms current of 100,000 amperes, and
at a power factor of less than 15%.
Arc Voltage.
• The arc voltage which develops across a fuse when it is
clearing a fault current must always exceed the system volt-
age.
• This arc voltage may reach a value which is twice that of the
system applied voltage.
12-17-98
SB98107
Rev. A
Form No. FBP
Page 1 of 3
BIF Doc #720041
Bussmann
®
Semiconductor Fuses
700 Volts AC/DC, 35-1000 Amps
Dimensional Data
3.56"
(90.5mm)
FBP
5.09"
(129.0mm)
2.81"
0.31"
(7.9mm)
(71.4mm)
4.09"
0.75"
(19.1mm)
2.09"
(53.2mm)
0.81"
(20.6mm)
(104.0mm)
2.66"
(67.5mm)
2.5"
(63.5mm)
0.53"
(13.5mm)
0.16"
(4.0mm)
0.125"
(3.2mm)
2.0"
(50.8mm)
35-60 Ampere Rating
3.59"
(91.3mm)
2.84"
0.31"
(7.9mm)
(72.2mm)
0.16"
0.75"
(19.1mm)
2.125"
(54.0mm)
1.06"
(27.0mm)
(3.97mm)
450-600 Ampere Rating
0.38"
(9.53mm)
0.16"
(4.0mm)
0.125"
(3.2mm)
6.19"
(157.2mm)
4.69"
(119.1mm)
70-100 Ampere Rating
3.19"
(81.0mm)
3.125"
(79.4mm)
4.09"
(104.0mm)
0.63"
(15.9mm)
3.09"
0.41"
(10.3mm)
(78.6mm)
2.125"
(54.0mm)
1.0"
(25.4mm)
2.0"
1.34"
(34.1mm)
(50.8mm)
0.16"
0.16"
(4.0mm)
0.38"
(9.53mm)
0.25"
(6.4mm)
(3.97mm)
125-200 Ampere Rating
5.09"
(129.0mm)
700-800 Ampere Rating
3.97"
(100.8mm)
6.75"
(171.5mm)
2.63"
(66.7mm)
1.5"
(38.1mm)
1.22"
(31.0mm
4.75"
(120.7mm)
3.19"
(81.0mm)
3.5"
(88.9mm)
2.125"
(54.0mm)
1.38"
(34.9mm)
0.56"
(14.3mm)
2.0"
(50.8mm)
0.06"
(1.6mm)
0.25"
(6.35mm)
250-400 Ampere Rating
900-1000 Ampere Rating
0.63"
(15.9mm)
0.5"
(12.7mm)
12-17-98
SB98107
Rev. A
Form No. FBP
Page 2 of 3
BIF Doc #720041
Bussmann
®
Semi-Conductor Fuses
700 Volts AC/DC
Time-Current Characteristic Curves–Average Melt
400
600
800
1000
100
200
60
AMPERE
RATING
FBP
100
10
TIME IN SECONDS
1
.1
10,000
CURRENT IN AMPERES
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 BIF 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 contained in this bulletin. Once a product has been select-
ed, it should be tested by the user in all possible applications.
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