Accessories
4.10 Accessories for integration in the power distribution equipment
3WA1 air circuit breaker
344 Equipment Manual, 02/2023, 92310000002-06
4.10.4 Grounding connection between the guide frame and the circuit breaker
4.10.4.1 Description
Normally, the metal parts on the circuit breaker are grounded through the direct contact
of the circuit breaker feet with the guide frame. The accessory "Grounding connection
between the guide frame and the circuit breaker" uses contact modules to provide an
additional grounding connection for ground short-circuit currents ≤ 60 kA independent of
its mounting configuration.
• When the circuit breaker is racked into the guide frame, the leading grounding
connection contacts before the main contacts make contact.
• When the circuit breaker is racked out, the grounding connection is maintained until
the main contacts are isolated.
The grounding connection between the guide frame and the withdrawable circuit breaker
comprises:
• For the guide frame:
– Ground short-circuit currents ≤ 30 kA: One contact module
– Ground short-circuit currents ≤ 60 kA: Two contact modules
• For the withdrawable circuit breaker:
– One contact module
You will find more information in the operating instructions available on the internet
(https://support.industry.siemens.com/cs/ww/en/view/109783682
).
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