A process for the deletion of an arc fault within a medium and high voltage switchgear, as well as short-circuit device itself

The invention relates to a process for the deletion of an internal arc in a medium and high voltage switchgear, wherein at least one short-circuit element between the phases of a three phase distribution is switched, according to the preamble of claims 1 and 3. Here, in order to make a reliable Storlichtbogenloschung, the invention proposes that by means of detected sensors of the arc and the shorting switching element is fired by means of a force acting directly on the short-circuit switching element explosive charge to a connected to the three phase conductors for short-circuit switching element complementarily shaped conical contact structure, such that with the aid of the complementary contours of short-circuit switching element and three-phase conductors a self-locking persistence in the short-circuit position, dispensing a holding force is achieved.