Siemens SENTRON 3WA1 - Interlocking of Two Circuit Breakers Using a Bowden Cable

Accessories
4.9 Interlocking
3WA1 air circuit breaker
332 Equipment Manual, 02/2023, 92310000002-06
4.9.2 Interlocking of two circuit breakers using a Bowden cable
Example
Possible circuit breaker statuses
Q1
Q2
Description
In the case of a line infeed via transformer and a generator infeed, a circuit breaker can
only ever be closed when the other one is open. Power is provided either by the normal
power supply (circuit breaker Q1) or the standby power supply (circuit breaker Q2).
Required materials
An interlocking module with a Bowden cable is required for each circuit breaker, i.e. two
mechanical interlocks must be ordered.
Connections of the Bowden cables
1st Bowden cable:
Q1 A1 - Q2 E1
2nd Bowden cable:
Q2 A1 - Q1 E1