The present invention relates to a DC switching device (2) comprising a plurality of arc-extinguishing chambers (50, 50', 51, 51', 52, 52') and a plurality of contacting units (70, 71, 72) conductively connected in series to each other, each of the contacting units including a stationary contact (61, 61') and a movable contact (32) movable between a rest position and a working position, an air gap is formed between the contacts when the movable contact is moved from the working position to the rest position and each of the chambers (50, 50', 51, 51', 52, 52') enclosing a contacting unit (70, 71, 72) and comprising a splitter plate unit including one or more splitter plates (101-107) arranged for splitting and cooling an arc occurring in the air gap between the contacts. At least one of the chambers (50, 50', 52, 52) includes a permanent magnet (80, 80') for generating a magnetic field between the contacting unit (70, 72) and the splitter plate unit and the splitter plates are made of non-ferromagnetic material, and the splitter plates of at least one of the chambers (51, 51') are made of ferromagnetic material.