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DEFA relay contact is adapted to DEFA PlugIn contacts and used for controlling the engine and interior heater together with DEFA control units. Can also be used for separat control of engine and interior heater together with DEFA SmartStart. At branching, use T or Y connectors. Note! You also need a DEFA extension cable to connect this relay contact to your DEFA system (Ref: relay contact userguide)