Siemens SENTRON - Auxiliary Switch; Additional Components

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4.5.2 Auxiliary switch
Auxiliary switches can usually be retrotted on the residual current operated
circuit breaker by the customer. They indicate the circuit breaker’s switching state.
Three variants are possible (1 NO/1 NC; 2 NCs; 2 NOs).
4.5.3 Additional components
Depending on the residual current protective devices version, the following
additional components can be retrotted where required:
• Fault signal contacts
• Undervoltage releases
• Shunt trips