Coupling contactor

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A coupling contactor is an electrical device in rail vehicles .

The coupling contactor is used to transfer the battery voltage of an intact system to the consumers of the failed system if an electrical system fails.

In the electric multiple units of the DB series 420 , these consumers are, for example, the inverter for the lighting as well as the computer and various other control systems. With this battery supply, a train can be driven from both driver's cabs even if a complete electrical system fails. The interior lighting also works in the entire multiple unit.

However, the drive power of the defective system is missing. Therefore, for safety reasons (lack of electrodynamic brake), the maximum speed should also be reduced to 70 km / h.