Electrical apparatus for the short circuit protection of a three phase load in a three phase system

摘要

The subject matter of the invention is an apparatus for the short circuit protection of a three phase load (1) in a three phase system comprising an input for connecting the apparatus (2 3 4) to a three phase power supply system (5) an output for connecting the three phase load (1) to the apparatus (2 3 4) a means for producing an auxiliary short circuit (4) in the three phase power supply system (5) by triggering the means (4) a means for identifying a short circuit (2) on the three phase load (1) and a means for generating a triggering pulse (3) when the short circuit is identified wherein the means for producing the auxiliary short circuit (4) and the means for identifying the short circuit (2) are provided in the current path between the input and the output and the means for producing the auxiliary short circuit (4) can be triggered by the triggering pulse.