Märklin-6084
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The Märklin k84 is one of the components of the Märklin Digital system for controlling model trains.
The Märklin k84 module is essentially 4 digital relays each with 2 mutually exclusive outputs. These modules are used for switching current on and off. The address of each module is set by a DIP switch inside the housing.
The current that is produced is continuous. Momentary switching for the purposes of switching electromagnetic devices is handled by a separate module - the k83.