Siemens UL 1066 User Manual

19 – 6
19.1.5 Mechanical interlocking three sources (open transition to standby system)
The standby system is mechanically interlocked with the two source circuit breakers to prevent paralleling the standby system with either or
both primary source(s).
Description:
Two circuit breakers (S
1
, S
3
) can be independently opened and closed, the third (S
2
) being ready to close only if the other two are open. If
the third is closed, the other two cannot be closed.


Materials required:
Each circuit breaker has an interlocking module and a Bowden cable. A Bowden cable must be ordered separately.
Order no.  (page 19-6)
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
2
A
1
- S
1
E
1
3rd Bowden cable: S
2
A
2
- S
3
E
1
4th Bowden cable: S
3
A
1
- S
2
E
2
S
1
S
2
S
3

Siemens UL 1066 Specifications

General

Brand	Siemens
Model	UL 1066
Category	Circuit breakers
Language	English