Jævnstrømsomskifteranordning, elektronisk indretning og fremgangsmåde til omskiftning af et tilhørende jævnstrømskredsløb

摘要

A direct current (DC) switching apparatus comprising: - at least a first mechanical switching device which is suitable to be positioned along an operating path of an associated DC circuit and comprises a fixed contact and a corresponding movable contact which can be actuated between a closed position where they are coupled to each other and current flows along the operating path, to an open position where they are separated from each other so as to interrupt the flow of current along the operating path, wherein an electric arc can ignite between the contacts under separation. The apparatus further comprises electronic means comprising a semiconductor device which is suitable to be positioned along a secondary path and connected in parallel with the first mechanical switching device. The electronic means are configured to allow commuting the flow of current from the operating path to the secondary path and extinguishing through the semiconductor device an electric arc ignited when the movable contact separates from the fixed contact when the first mechanical switching device fails to extinguish it.