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Ashley JonesAug 13, 2025
What to do if Siemens GMSG-GCB Circuit breakers fails to close?
- VVanessa MunozAug 13, 2025
If a Siemens circuit breaker fails to close, it could be due to a few reasons. Check if the secondary control circuit is de-energized or if the control circuit fuses are blown, and energize or replace them if needed. Also, check if the secondary disconnect contacts 15 or 16 are engaging properly, and replace if required. Inspect for any damage to wiring, terminals, or connectors, and repair as necessary. If the charging motor (88) has failed, replace it. Also, see if the motor cut-off switch LS21 or LS22 is not operating, and replace it if necessary.
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