Datasheet
Form No.
Page 2 of 2
BIF Doc #720024
Bussmann
®
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British Style BS 88
690V 6-700A
®
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).
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 .
Electrical Characteristics
Dimensions
200 300 400 500 600
660
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1)
2)
E
g
K
1500
1000
500
200
400 600 660
E
g
U
L
1)
2)
Kp
1.0
0.8
0.4
0.5
0.6
0.3
0.2
0.1
30 40 50 60
70
80 90 100%
I
b
7763.5
48
17.1
19.1
12.7
7.1
9.7
947046
37
19
31.8
8.7
11.9
113
A50
41
38.1
25.4
10.3
13.5
113A50
83
38
25.4
10.3
14
Fig. 2: ET, FE
74.664.354.8
6.4
8.7
8.7
4
5.5
Fig. 1: CT Fig. 3: EET, FEE
Fig. 4: FM, MT
Fig. 5: FMM, MMT
Dimensions in mm.
1mm = 0.0394∑ 1∑ = 25.4mm
1) CT, ET, EET, FE, FEE, MT, MMT
2) FM, FMM
1) CT
2) ET, FE, EET, FEE, FM, FMM
“A”
Type Dimension
FM 80-85
FMM 80-85
MT 85
MMT 85
7-18-01
SB01191