The power supply Enertex KNX Dual PowerSupply 1280 (6 TE) provides two separately operating KNX power supplies with 1280 mA and 320 mA and a third 30V auxiliary voltage supply with 320 mA (100% overloadable). The device allows a compact realization of a powerful inner line in conjunction with another physically and topologically separated second outer line. The additional 30 V auxiliary voltage output provides a DC supply for other devices or a third KNX line (320 mA) via another external KNX choke. Each of the three outputs has its own current limiter, which protects against short circuit and overload. The limitation is selective so that the other two outputs or lines can continue to operate normally in the event of a short circuit of one output or KNX line. The device also has measurement and diagnostic functions. Measurements and device parameters are displayed on the OLED display of the device, e.g. for both KNX and auxiliary voltage outputs current, voltage and peak current with time stamp. Set-up, maintenance and analysis of the KNX installation is significantly simplified. Further measurement and diagnostic data are sent to the main line via group objects, including housing internal temperature, telegram rate, energy meter and the last bus voltage failure, the last bus voltage return and the last remote reset with time stamp. Communication via group addresses is carried out using standard KNX protocol unencrypted or encrypted with KNX Data Secure. With the help of two KNX group addresses, a separate bus reset can be executed for the main line and secondary line. In addition, the KNX Dual PowerSupply 1280 has an integrated real-time clock with power reserve of approx. 36 hours and can be parameterised as a timer. An extensive gear shift application is included.