A contactor-circuit breaker device (2, 102, 202), comprising: - a mechanical switch including at least two pairs of contacts (10, 12), each pair of contacts (10, 12) comprising a stationary contact (14, 16) and a moving contact (18, 20) capable of being put in contact with each other, the stationary contacts (14, 16) being connected in series to an electrical circuit, the mechanical switch being capable of switching between a closed configuration of the electrical circuit, in which the stationary (14, 16) and moving (18, 20) contacts of each pair of contacts (10, 12) are in mechanical contact, and an open configuration of the electrical circuit, in which the stationary (14, 16) and moving (18, 20) contacts of at least one pair of contacts (10, 12) are separated from each other; - a support member for the moving contacts (18, 20); - a current cutoff module comprising a semiconductor device, the cutoff module being connected in parallel to one of the pairs of contacts (10, 12) when the switch is in the open configuration and being able, when the switch is in the open configuration and an electric arc appears in at least one of the pairs of contacts (10, 12), to switch the current from the electrical circuit to the cutoff module and interrupt the current circulating in the electrical circuit, and - a movement apparatus for moving the support member comprising an armature, the movement apparatus being capable of translating the armature such that the support member switches between the closed configuration and the open configuration of the electrical circuit through a translational and/or rotational movement, wherein the switch is capable of reaching a maximally open configuration and in that the device includes a stop part capable of stopping the translational and/or rotational movement of the support member when the switch reaches the maximally open configuration, the stop part being arranged to put in contact with the moving contact of the pair in which the distance between the moving contact and the stationary contact is smallest when the switch is in its maximally open configuration, characterized in that the cutoff module is connected to the stop part. - a mechanical switch including at least two pairs of contacts (10, 12), each pair of contacts (10, 12) comprising a stationary contact (14, 16) and a moving contact (18, 20) capable of being put in contact with each other, the stationary contacts (14, 16) being connected in series to an electrical circuit, the mechanical switch being capable of switching between a closed configuration of the electrical circuit, in which the stationary (14, 16) and moving (18, 20) contacts of each pair of contacts (10, 12) are in mechanical contact, and an open configuration of the electrical circuit, in which the stationary (14, 16) and moving (18, 20) contacts of at least one pair of contacts (10, 12) are separated from each other; - a support member for the moving contacts (18, 20); - a current cutoff module comprising a semiconductor device, the cutoff module being connected in parallel to one of the pairs of contacts (10, 12) when the switch is in the open configuration and being able, when the switch is in the open configuration and an electric arc appears in at least one of the pairs of contacts (10, 12), to switch the current from the electrical circuit to the cutoff module and interrupt the current circulating in the electrical circuit, and - a movement apparatus for moving the support member comprising an armature, the movement apparatus being capable of translating the armature such that the support member switches between the closed configuration and the open configuration of the electrical circuit through a translational and/or rotational movement, wherein