(500 Vdc/Interrupting rating 50ka) U.L. Recognition for CT, ET, FE, EET, FEE, FM & FMM.
Watts loss provided at rated current.
Note: FC, 8ET, 12ET, 15ET, 20ET, 65EET and 75EET are available for replacement purposes on existing equipment.
7-18-01
SB01191
Form No.
Page 1 of 2
BIF Doc #720024
Bussmann
British Style BS 88
®
690V
6-700A
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%.
®
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).
1.6
1.4
1.2
1.0
0.8
0.6
500
0.4
0.2
200
1)
2)
E
g
300
400
500
600 660
200
400
1) CT, ET, EET, FE, FEE, MT, MMT
2) FM, FMM
1) CT
2) ET, FE, EET, FEE, FM, FMM
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
K
1500
U
L
1)
0.6
0.5
0.4
0.3
0.2
1000
2)
E
g
600 660
0.1
30 40 50
60
70
I
b
80 90 100%
Dimensions
Fig. 1: CT
4
5.5
Fig. 2: ET, FE
7.1
Fig. 3: EET, FEE
8.7
54.8 64.3 74.6
48 63.5 77
46 70 94
11.9
9.7
6.4
8.7
8.7
12.7
17.1
31.8
37
19
Fig. 4: FM, MT
25.4
19.1
Fig. 5: FMM, MMT
25.4
50
50
A
113
14
13.5
10.3
10.3
A
113
Type
FM
FMM
MT
MMT
“A”
Dimension
80-85
80-85
85
85
83
41
38.1
Dimensions in mm.
1mm = 0.0394∑
1∑ = 25.4mm
38
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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 selected, it should be tested by the user in all possible applications.
