Accessories
4.9 Interlocking
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
339
4.9.8 Interlock system to prevent unauthorized closing
4.9.8.1 Description
An interlock system for interlocking three circuit breakers is available in which only two
circuit breakers can be closed.
In this interlock system, the open circuit breaker can only be closed if one of the two
closed circuit breakers is opened first.
The interlock system is based on the locking provision to prevent unauthorized closing -
Safe Open. The locks used have the same cylinder. However, only two keys are provided
and this ensures that one circuit breaker must always remain open.
The interlock system is not supplied preinstalled and can only be installed by the
customer.
The scope of supply includes:
• Three locks with the same cylinders for three circuit breakers
• Two identical keys
You will find more information in the operating instructions available on the internet
(https://support.industry.siemens.com/cs/ww/en/view/109783685
).
4.9.8.2 Activation
Activation is identical to the activation of a locking provision to prevent unauthorized
closing - Safe Open, see Chapter Activation (Page 308) on this topic.
4.9.8.3 Article number
Interlock system to prevent unauthorized closing
For 3 circuit breakers with key operation, made by CES
You can purchase the accessories in the Siemens Industry Mall
(http://www.siemens.com/product?3WA9111-0BA43
).
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