Siemens UL 489 - Mechanical Interlocking Two Sources with a Tie Circuit Breaker (Open Transition)

19 – 4
19.1.3 Mechanical interlocking two sources with a tie circuit breaker (open transition)
The two sources are interlocked to prevent paralleling (open transition).
Description:
Any two circuit breakers can be closed, with the third being interlocked.
Materials required:
Each circuit breaker has an interlocking module and a Bowden cables. Three additional Bowden cables must be ordered separately.
Order no.  (page 19-4)
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