Bussmann
FWX 250V 35-2500A
Electrical Characteristics Ordering Information Dimensions Curves
2 2
I t (A Sec)
Rated Carton
Current Clearing Watts Part Carton Weight Figure
Type RMS-Amps Pre-arc at 250V Loss Number Qty. (lbs) Number BIF #
35 50 230 4.2 FWX-35A
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40 60 310 5.2 FWX-40A
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45 80 390 5.7 FWX-45A 5 1.40
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50 100 520 6.0 FWX-50A
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60 140 740 8.1 FWX-60A
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70 330 1400 7.2 FWX-70A
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80 430 1850 8.1 FWX-80A
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90 570 2450 9.0 FWX-90A
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100 740 3150 10.0 FWX-100A
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0.32 359
125 1130 4850 12.5 FWX-125A
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150 1620 6950 15.7 FWX-150A
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175 2170 9300 18.5 FWX-175A
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Fig. 1
200 2790 12000 22 FWX-200A
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225 3210 14700 24 FWX-225A
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250 3960 18100 27 FWX-250A
FWX ______________________________________________________________________________________
250V
275 4720 21600 31 FWX-275A
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300 6000 27300 32 FWX-300A
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350 10600 48600 39 FWX-350A 1 0.52
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400 14500 66100 44 FWX-400A
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450 22100 101000 49 FWX-450A
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500 28000 128000 54 FWX-500A
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600 41100 188000 62 FWX-600A
______________________________________________________________________________________ ______________
700 48800 190000 72 FWX-700A
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0.90
800 59000 230000 84 FWX-800A
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1000 44000 360000 100 FWX-1000AH
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Fig. 2
1200 92000 750000 103 FWX-1200AH
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1500 120000 880000 140 FWX-1500AH 35785299
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2.86
1600 160000 1200000 140 FWX-1600AH
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Fig. 3
2000 320000 2300000 151 FWX-2000AH
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2500 670000 4700000 163 FWX-2500AH
U.L. Recognition on 35 through 800 amperes only. 1 kg = 2.2 lbs 1 lb = 0.45 kg
n Interrupting rating 200kA RMS Symmetrical.
n Watts loss provided at rated current.
n (250 Vdc/Interrupting rating 20kA) U.L. Recognition on 35 through 800 amperes only.
Form No. FWX 250
Page 1 of 2
7-11-01 SB01191
BIF Doc #720005
Bussmann
FWX 250V 35-2500A
Electrical Characteristics
2
Total Clearing I t Arc Voltage Power Losses
2
The total clearing I t at rated voltage and This curve gives the peak arc voltage, Watts loss at rated current is given in
at power factor of 15% are given in the U , which may appear across the fuse the electrical characteristics. The curve
L
electrical characteristics. For other volt- during its operation as a function of the allows the calculation of the power
2
ages, the clearing I t is found by multi- applied working voltage, E , (RMS) at a losses at load currents lower than the
g
plying by correction factor, K, given as power factor of 15%. rated current. The correction factor, K ,
p
a function of applied working voltage, is given as a function of the RMS load
E , (RMS). current, I , in % of the rated current .
g b
1.4 1.0
1.5
Kp
U
K 1.2
L 0.8
3
10
1.0
0.6
0.5
800
0.4
600
1)
0.5
0.3
500
2)
400
0.2
1)
0.3
0.2 300
2)
E
g I
b
Eg
0.1
200
0.15
30 40 50 60 80 90 100%
50 100 150 200 250 70
75 125 200 250 300
1) 35-800 Amp Range 1) 35-800 Amp Range
2) 1000-2500 Amp Range 2) 1000-2500 Amp Range
Dimensions
Fig. 1: 35-800 Amp Range Fig. 2: 1000-1200 Amp Range Fig. 3: 1500-2500 Amp Range
J
A
A
ADCE
D
C
B
B C
F
G
H
B
Order # Fig. A B C D E F G H J Thread Depth
FWX-35A-60A 1 3.19 0.81 1.59 2.59 2.25 0.34 0.63 0.13 0.52
FWX-70A-200A 1 3.13 1.22 1.59 2.44 2.19 0.34 1.00 0.19 0.47
FWX-225A-600A 1 3.84 1.50 1.59 2.94 2.25 0.41 1.00 0.25 0.75
FWX-700A-800A 1 3.84 2.00 1.59 3.03 2.28 0.41 1.50 0.25 0.78
FWX-1000AH-1200AH 2 2.59 3.00 1.50 Tapped -24
FWX-1500AH-2500AH 3 2.59 3.50 1.50 1.50 Tapped -24
Dimension in inches.
1mm = 0.0394 1 = 25.4mm
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Form No.FWX 250
Page 2 of 2
7-11-01 SB01191 BIF Doc #720005