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Circuit-breakers
Shutdown of the undervoltage release
 
Interlocking of several circuit-breakers using an undervoltage release
When interlocking 3 or more circuit-breakers, each circuit-breaker must be interlocked with the series-connected normally closed contacts of the auxiliary contacts on the other circuit-breakers using one contactor relay – for contact duplication – per auxiliary contact. If one of the circuit-breakers is closed, the others cannot be closed.

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