38
9.4 Max. number of
breaking operations
for the vacuum
chambers
The diagrams define exclusively the
admissible number of breaking ope-
rations of the vacuum interrupter
chambers. They indicate whether the
vacuum interrupter chambers need
to be replaced.
The data for the rated normal current
and rated short-circuit opening cur-
rent are indicated on the rating plate.
Fig. 9.9
Rating plate
I
r
= Rated normal current [A]
I
sc
= Rated short-circuit breaking current [kA]
30,000
10,000
5,000
1,000
500
100
50
10
Breaking current log I
a
I
r
I
SC
No. of breaking operations n
To Next Page
Loading...