Accessories
4.9 Interlocking
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
335
4.9.5 Interlocking of three circuit breakers, two of which are interlocked, using
a Bowden cable
Example
Possible circuit breaker statuses
Description
The normal power supply (circuit breaker Q1) and the standby power supply (circuit
breaker Q3) are isolated by means of a coupling (circuit breaker Q2). The normal power
supply can also supply the loads of the standby power supply via the coupling. The
standby power supply can only supply the loads of the standby power supply. The normal
power supply circuit breaker (Q1) can be closed and opened independently of the other
two. As the standby power supply can only supply the loads of the standby power supply,
the coupling (circuit breaker Q2) must be opened when the standby power supply infeed
(circuit breaker Q3) is switched on. Only interlocking of the two circuit breakers Q2 and
Q3 is required for this reason.
Required materials
An interlocking module with a Bowden cable is required for each circuit breaker, i.e.
three mechanical interlocks must be ordered.
Connections of the Bowden cables
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