| 摘要 |
The invention relates to a switch (1) suitable for DC applications comprising two fixed conductive contacts (2) with first contact areas (21, 22), a movable conductive bridge (3) with two second contact areas (31, 32) for being connected to the two first contact areas (21, 22) in the on-status and for being disconnected from the two the first contact areas (21, 22) in the off-status and two arc-extinguishing units (41, 42) to extinguish electric arcs (51, 52) occurring between the first and second contact areas (21, 22, 31, 32) after disconnecting the second contact areas (31, 32) from the first contact areas (21, 22), wherein first conductive arc-guiding elements (61) extend from each first contact area (21, 22) into the corresponding arc-extinguishing unit (41, 42) and at least one second conductive arc-guiding element (62) extends into the arc-extinguishing units (41, 42) suitably shaped to guide the electric arcs (51, 52) from each of the second contact areas (31, 32) of the movable bridge (3) into the arc-extinguishing units (41, 42), wherein at least two permanent magnets (71, 72) are suitably arranged adjacent to the first and second contact areas (21, 22, 31, 32) to provide a magnetic field (B) suitable to support the guiding of the electric arc (51, 52) into the arc-extinguishing units (41, 42), wherein at least parts (621, 622) of the second arc-guiding element (62) are made of a magnetic permeable material, which are connected to the permanent magnets (71, 72) as a back iron for the permanent magnets (71, 72) to increase the strength of the magnetic field (B) between the permanent magnets (71, 72). |
