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.