An apparatus (10) for interrupting a light beam, in particular a laser light beam, with a light beam deflection device (24), wherein the light beam deflection device (24) is arrangeable in the light path of the light beam. An apparatus (10) is characterized in that the light beam deflection device (24) is arranged on a bendable material strip (18), wherein the material strip (18) is held on one side on one end and magnetizable or magnetic sections (20, 22) are arranged on the area facing away from the held end of the material strip (18), preferably on both sides of the material strip (18), wherein a magnet (40, 42) is provided for each section arranged on the material strip (18) and wherein the sections (20, 22) are or can be brought in engagement with the magnetic field of each magnet (40, 42).