Automatic main on-off switch for energy-saving operation readiness/stand-by of telecommunication devices i.e. facsimile has double layer capacitor for storing energy

摘要

Line voltage for telecommunication device is switched with very small control power/performance via an electronic load relay. In the idle condition no auxiliary energy is needed and the activation energy stored in a double layer capacitor. As soon as the incoming call has been recognized and the telephone line activated, the energy store is recharged with the aid of the flowing current loop.