Electromechanical switching device for an electric power circuit comprising at least one system for detecting the contact or non-contact position of a blade of a contactor

A switching device comprising

• at least one main contactor,
• an upstream section of an electric power circuit, and
• a downstream section of the electric power circuit,
• the upstream section and the downstream section being positioned on either side of the main contactor,
• said main contactor being configured to assume open and closed states,
• a spring,
• a control power supply, and
• an actuator configured to cause the main contactor to change from the open state to the closed state against a force generated by the spring when the actuator is powered by a control signal generated by the control power supply that is equal to a first level,
• the spring being arranged to cause the main contactor to change from the closed state to the open state when the actuator is not powered,
• the main contactor comprising a blade and at least one terminal, the blade being configured to assume a position in contact with said terminal and a position not in contact with said terminal,
• wherein the switching device comprises a detection system configured to determine the contact or non-contact position of the blade of the main contactor, to generate at least one second signal as a function of the determined position of the blade of the main contactor and to transmit said second signal to the control power supply,
• wherein the control power supply is configured to generate a control signal configured to keep the main contactor in the closed state upon reception of the second signal, and
• wherein the control power supply is configured so that the control signal is equal to the first level for a first given duration starting from the reception of a first signal and then to a second level, lower than the first level, to keep the main contactor in the closed state as long as the main contactor has to be kept in the closed state, and to a third level higher than the second level upon reception of the second signal transmitted by the detection system.