Siemens UL 489 - Mechanical Interlocking Feeder Circuit Breakers (Single Load, Open Transition)

19 – 5
19.1.4 Mechanical interlocking feeder circuit breakers (single load, open transition)
The feeder breakers are interlocked so that only one feeder may be closed at a time.
Description:
When one circuit breaker is closed, the other two cannot be closed.
Materials required:
Each circuit breaker has an interlocking module and a Bowden cable. Three additional Bowden cables must be ordered separately.
Order no.  (page 19-5)
Connections of Bowden cables:
Example Possible circuit breaker states
S
1
S
2
S
3
1st Bowden cable: S
1
A
1
- S
2
E
1
2nd Bowden cable: S
1
A
2
- S
3
E
1
3rd Bowden cable: S
2
A
1
- S
1
E
1
4th Bowden cable: S
2
A
2
- S
3
E
2
5th Bowden cable: S
3
A
1
- S
1
E
2
6th Bowden cable: S
3
A
2
- S
2
E
2
S
1
S
2
S
3