An insulated glazing unit comprising: - a frame ; - at least two partially or totally transparent panes associated with said frame to define a gap ; - a box arranged proximate to an upper portion of the frame and inside the gap ; - screening means inserted in said gap and adapted to alternate at least between a retracted configuration in which they permit light passage through said gap and a deployed configuration in which they at least partially block light passage in said gap ; - actuator means arranged in the box and comprising an electric motor operably associated with said screening means to alternate them between the retracted configuration and the deployed configuration; - power supply means operably connected with said actuator means and comprising: - a stationary portion which comprises a support external to the gap and an electric cable , said electric cable electrically connecting said support to said electric motor , - a moving portion adapted to be electrically connected/disconnected to/from said stationary portion , - a control unit in signal communication with said electric motor , said control unit being configured to switch on/off said electric motor , wherein it comprises an active electronic circuit in signal communication with said control unit and at least configured to store identification data of said control unit , characterised in said active electronic circuit being integrated in said support of said stationary portion of said power supply means . - a frame ; - at least two partially or totally transparent panes associated with said frame to define a gap ; - a box arranged proximate to an upper portion of the frame and inside the gap ; - screening means inserted in said gap and adapted to alternate at least between a retracted configuration in which they permit light passage through said gap and a deployed configuration in which they at least partially block light passage in said gap ; - actuator means arranged in the box and comprising an electric motor operably associated with said screening means to alternate them between the retracted configuration and the deployed configuration; - power supply means operably connected with said actuator means and comprising: - a stationary portion which comprises a support external to the gap and an electric cable , said electric cable electrically connecting said support to said electric motor , - a moving portion adapted to be electrically connected/disconnected to/from said stationary portion , - a stationary portion which comprises a support external to the gap and an electric cable , said electric cable electrically connecting said support to said electric motor , - a moving portion adapted to be electrically connected/disconnected to/from said stationary portion , - a control unit in signal communication with said electric motor , said control unit being configured to switch on/off said electric motor , wherein it comprises an active electronic circuit in signal communication with said control unit and at least configured to store identification data of said control unit , characterised in said active electronic circuit being integrated in said support of said stationary portion of said power supply means . <EOS>