®
Bu s s m a n n
Britis h Style BS 8 8
®
690V 6-700A
Electrical Characteristics
Total Clearing I2t
Arc Voltage
Power Losses
The total clearing I2t at rated voltage and This curve gives the peak arc voltage,
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, Kp,
is given as a function of the RMS load
current, Ib, in % of the rated current .
at power factor of 15% are given in the
electrical characteristics. For other volt-
ages, the clearing I2t is found by multi-
plying by correction factor, K, given as
a function of applied working voltage,
Eg, (RMS).
UL, which may appear across the fuse
during its operation as a function of the
applied working voltage, Eg, (RMS) at a
power factor of 15%.
1.0
Kp
1.6
K
1.4
UL
0.8
1500
1)
0.6
0.5
1.2
0.4
0.3
1.0
0.8
0.6
1000
2)
0.2
500
0.4
1)
2)
0.2
Ib
Eg
600 660
0.1
Eg
660
30 40 50 60
80 90 100%
70
200
400
200 300 400 500 600
1) CT, ET, EET, FE, FEE, MT, MMT
2) FM, FMM
1) CT
2) ET, FE, EET, FEE, FM, FMM
Dimensions
Fig. 1: CT
Fig. 2: ET, FE
Fig. 3: EET, FEE
4
8.7
7.1
5.5
46 70 94
54.8 64.3 74.6
63.5 77
48
11.9
9.7
31.8
37
12.7
17.1
6.4
8.7
8.7
Fig. 5: FMM, MMT
Fig. 4: FM, MT
19
25.4
19.1
25.4
“A”
Type
Dimension
50
A
113
FM
FMM
MT
80-85
80-85
85
50
A
113
MMT
85
14
13.5
10.3
10.3
83
Dimensions in mm.
1mm = 0.0394∑
41
1∑ = 25.4mm
38.1
38
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 contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications.
Form No.
Page 2 of 2
SB01191
7-18-01
BIF Doc #720024
COOPER [ COOPER BUSSMANN, INC. ]
