Electrical installation device e.g. key switch, releasing system, has transponder providing return radio signals to transmitting and receiving unit, and releasing unit releasing control signals of receiving unit to activate device

摘要

The system has a transmitting and receiving unit (4) transmitting radio signals with characteristic data in cyclical manner and an external transponder (6) containing the data. The transponder enters into a radio area of the unit and provides return radio signals to the unit. A releasing unit (3) releases control signals of the unit (4) for the activation of the function of an electrical installation device.