Device for braking electrically conducting strips

Device to brake an electrically conductive strip (B) which is located before a station for further processing in which the strip is processed under tensile stress and which is provided with a magnetic field generating device (3) which alternates an alternating magnetic field which induces eddy currents into the strip (B) which exert a force on said strip (B) that is contrary to the direction of its travel (F), whereby the magnetic field generating device (3) comprises at least two magnetic rollers (4, 5) rotating in a direction contrary to the direction of travel (F) of the strip (B) and are aligned at a right angle to the direction of travel of the strip (B) and which being provided with magnetic poles (6, 7) of different polarities that are placed in alternating sequence on its circumferential surface, whereby at least one magnetic roller (4) is assigned to the top (O) and at least one additional magnetic roller to the underside (U) of the strip (B), characterized in that each of the magnetic rollers (4, 5) is surrounded by a casing (8) made of a non-conductive material and in that they form an air gap (L) through which the strip (B) can be guided without contact with the magnetic roller (4, 5).