Abstract: The present invention relates to an insulated glazing unit (1) adapted to be inserted in a door or window comprising a frame (2); at least two partially or totally transparent panes (4) associated with said frame (2) to define a gap (5); screening means (6) inserted in said gap (5) and adapted to be alternated at least between a retracted configuration in which they allow the passage of light through said gap (5) and a deployed configuration in which they at least partially block the passage of light in said gap (5); actuator means (8) comprising an electric motor (8a) operably associated with said screening means (6) to alternate them at least between the retracted configuration and the deployed configuration; power supply means (13) operably connected to said actuator means (8) and comprising a stationary portion (14) and a moving portion (15) adapted to be electrically connected/disconnected to/from said stationary portion (14), a control unit (9) in signal communication with said electric motor (8a) of sa