Switch unit with arc-extinguishing units

A switch suitable for DC applications, comprising:

• two fixed conductive contacts with first contact areas;
• a movable conductive bridge with two second contact areas for being connected to the two first contact areas in the on-status and for being disconnected from the two the first contact areas in the off-status;
• and
• two arc-extinguishing units configured to extinguish electric arcs occurring between the first and second contact areas after disconnecting the second contact areas from the first contact areas;
• wherein first conductive arc-guiding elements extend from each first contact area into the corresponding arc-extinguishing unit and at least one second conductive arc-guiding element extends into the arc-extinguishing units suitably shaped to guide the electric arcs from each of the second contact areas of the movable bridge into the arc-extinguishing units:
• wherein at least two permanent magnets are suitably arranged adjacent to the first and second contact areas to provide a magnetic field suitable to support the guiding of the electric arc into the arc-extinguishing units;
• and
• wherein at least parts of the second arc-guiding element are made of a magnetic permeable material, which are connected to the permanent magnets as a back iron for the permanent magnets to increase the strength of the magnetic field between the permanent magnets.