An automatic system (1) for closing windows or doors, comprising a counter-plate (2) provided with a first member (3) and a lock body (20). Closing means (4) is movable between a release configuration, in which it engages the counter-plate (2) when the latter is aligned with the lock body (20), and a retained configuration, in which it is maintained inside the lock body (20) and does not engage the counter-plate (2). A switch (5) is mounted in the lock body (20) and is configured to assume a locking configuration in which the switch (5) locks the closing means (4) in the retained configuration and an unlocking configuration in which the switch unlocks the closing means (4). The switch (5) and the first member (3) are configured to exchange an activation magnetic-type action adapted to switch the switch (5) from the locking configuration to the unlocking configuration only in a final approaching step of the lock body (20) to the counter-plate (2).
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