A device for connecting and disconnecting an electrical apparatus by a first line and a second line, the device comprising a first part, carrying at least one first pole belonging to the first line; a second part, carrying at least one second pole belonging to the first line; the first part being movable relative to the second part in a connection and disconnection direction; a movable support guided in movement with respect to the first part, the support carrying at least one first pole belonging to the second line; the second part carrying at least one second pole belonging to the second line; at least one lock for securing the support with respect to the first part; the connection and disconnection device defining a first operating area in which: the at least one first pole belonging to the first line is in contact with the at least one second pole belonging to the first line so as to close the first line, and the at least one first pole belonging to the second line is in contact with the at least one second pole belonging to the second line so as to close the second line, the distance separating the first part from the second part being less than a first threshold; the connection and disconnection device defining a second operating area in which: the at least one first pole belonging to the first line is separated from the at least one second pole belonging to the first line so as to open the first line, and the at least one first pole belonging to the second line is in contact with the at least one second pole belonging to the second line so as to close the second line, the distance separating the first part from the second part being comprised between the first threshold and a second threshold; the connection and disconnection device defining a third operating area in which: the at least one first pole belonging to the first line is separated from the at least one second pole belonging to the first line so as to open the first line, and the at least one first pole belonging to the second line is separated from the at least one second pole belonging to the second line so as to open the second line, the distance separating the first part from the second part being greater than the second threshold; the at least one lock being configured to secure the support and the first part when the distance separating the first part and the second part becomes greater than the second threshold, and to detach the support from the first part when the distance separating the first part and the second part becomes less than or equal to the second threshold.