KNX System Components KNX Power Supply KNX power supplies generate voltage for the KNX system. (SELF) The KNX line is separated from the power supply by an insulated coil.The voltage output is protected against short circuit and overload. Indicates the device output status with two-color LED. It has an external 30VDC output.This product cannot be programmed over ETS. • Power Supply, 160mA • Power Supply, 320mA • Power Supply, 640mA