Abstract: Breaking device (2) for singularizing ceramic conductor plates (18) along weakening lines (20) on a ceramic conductor plate (18), comprising a breaking trap (4, 6) with support plates (10, 12) displaceable relative to one another, which can be displaced from an initial position in which the support plates (10, 12) adjoin along a breaking line (14) and form an essentially flat support surface (16) into a breaking position in which the support plates (10, 12) are arranged with an angle toward one another and comprising a pinning device (50, 8) which is formed such that for a breaking operation the ceramic conductor plate is positioned against the support plates (10, 12), characterized in that the breaking trap (4, 6) comprising two support plates (10, 12), which adjoin along a breaking line (14), the pinning device (52, 8) comprising an oblong engagement section (58, 60) which is narrow transverse to the longitudinal direction, and the breaking device (2) comprising a positioning element (44) which is formed