A double-break contactor comprising: - a movable bridge being movable between a closed state and an open state, comprising a first movable contact and a second movable contact, and, - a first fixed contact facing the movable contact and - a second fixed contact facing the movable contact, - wherein, in the closed state, the first and second movable contacts (2a, 2b) are in contact with the first and second fixed contacts (1, 1a, 1b) respectively and, in the open state, the first and second movable contacts (2a, 2b) are distant from the first and second fixed contacts (1a, 1b) respectively, - two magnets (13, 14) capable of generating a magnetic field having constant direction so as to generate a magnetic force to move an arc (9, 10) appearing between the fixed contacts (1, 1a, 1b), and the movable contacts (2a, 2b) of the movable bridge switching from a closed state to an open state, - two fin blocks (4, 5) each having: ∘ a first end (42, 52) and a second end (43, 53), ∘ fins between the first end (42, 52) and the second end (43, 53) of the corresponding fin block (4, 5), ∘ a first and a second extinction zone each formed by the fins, - four arc guides (7, 8) running from the movable contacts (2a, 2b) of the bridge to the two fin blocks (4, 5), - characterised in that fin notches forming a groove of fin blocks (4, 5) among the fins of each of the two fin blocks (4, 5) face each corresponding arc guide (7, 8), and in that the contactor further comprises four arc guides (21, 22) each running from one of the corresponding fixed contacts (1, 1a, 1b) to one of the corresponding fin blocks (4, 5) respectively. - a movable bridge being movable between a closed state and an open state, comprising a first movable contact and a second movable contact, and, - a first fixed contact facing the movable contact and - a second fixed contact facing the movable contact, - wherein, in the closed state, the first and second movable contacts (2a, 2b) are in contact with the first and second fixed contacts (1, 1a, 1b) respectively and, in the open state, the first and second movable contacts (2a, 2b) are distant from the first and second fixed contacts (1a, 1b) respectively, - two magnets (13, 14) capable of generating a magnetic field having constant direction so as to generate a magnetic force to move an arc (9, 10) appearing between the fixed contacts (1, 1a, 1b), and the movable contacts (2a, 2b) of the movable bridge switching from a closed state to an open state, - two fin blocks (4, 5) each having: ∘ a first end (42, 52) and a second end (43, 53), ∘ fins between the first end (42, 52) and the second end (43, 53) of the corresponding fin block (4, 5), ∘ a first and a second extinction zone each formed by the fins, ∘ a first end (42, 52) and a second end (43, 53), ∘ fins between the first end (42, 52) and the second end (43, 53) of the corresponding fin block (4, 5), ∘ a first and a second extinction zone each formed by the fins, - four arc guides (7, 8) running from the movable contacts (2a, 2b) of the bridge to the two fin blocks (4, 5), - characterised in that fin notches forming a groove of fin blocks (4, 5) among the fins of each of the two fin blocks (4, 5) face each corresponding arc guide (7, 8), and in that the contactor further comprises four arc guides (21, 22) each running from one of the corresponding fixed contacts (1, 1a, 1b) to one of the corresponding fin blocks (4, 5) respectively.