ABB VD4 Series Instruction Manual - page 8
a) Circuit-breaker type VD4, 36 kV and 40.5 kV
Rated short-circuit breaking current 25 kA
b) Circuit-breaker type VD4, 36 kV and 40.5 kV
Rated short-circuit breaking current 31.5 kA
Breaking current I (kA)
a
Breaking current I (kA)
a
10
8
8
6
4
3
2
10 5
8
6
4
3
2
4
10
8
8
6
4
3
2
3
10
8
6
4
3
2
2
10
8
6
5
0.05
0.1
0.2
0.3 0.4 0.6 0.8 1
2
3
4
6
8 10
20
30 40 60
10
8
8
6
4
3
2
10 5
8
6
4
3
2
4
10
8
8
6
4
3
2
3
10
8
6
4
3
2
2
10
8
6
5
0.05
0.1
0.2
0.3 0.4 0.6 0.8 1
2
3
4
6
8 10
20
30 40 60
Rated
current
1250 A
1600 A
2000 A
2500 A
2.4 Permissible number of vacuum interrupter switching
operations in relation to breaking current
See figure 2/1.
Rated
current
1250 A
1600 A
2000 A
2500 A
8 Technical data | VD4 Vacuum Circuit-breaker
Figure 2/1 Permissible number of vacuum interrupter operating cycles n as a function of the breaking current I
a
Figure 2/1