The present invention relates to a discharger (1) of switching comprising at least one first electrode and a second electrode is electrically conductive, each comprising a zone of arc placed opposite the zone of an arc of the other electrode, the electrodes being adapted to be connected to terminals a voltage source, characterized in that the spark gap (1) has a generally tubular shape, said first electrode (2) forming a cylindrical body (3) of the spark gap, which is open at its two ends and the second electrode, called the central electrode (4), cylindrical and coaxial with the first extending along the axis of the spark gap of at least one end to the other of the cylindrical body (3).
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