| CPC H01H 33/08 (2013.01) [H01H 33/53 (2013.01)] | 16 Claims |
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1. A switch pole for a low voltage switching device comprising:
an insulating casing defining an internal space with a contact region and an arc extinguishing region of the switch pole;
a fixed contact assembly and a movable contact assembly positioned in the contact region and including, respectively, one or more fixed contacts and one or more movable contacts, which can be mutually coupled or uncoupled; and
an arc chamber positioned in the arc extinguishing region and comprising a plurality of arc-breaking elements, wherein the plurality of arc-breaking elements comprise a plurality of parallel arc-breaking plates and a terminal arc-breaking element, the terminal arc-breaking element arranged in distal position from the fixed contact assembly compared to the plurality of parallel arc-breaking plates, wherein the terminal arc-breaking element comprises a plate portion arranged in parallel to the plurality of parallel arc-breaking plates and having a first surface facing the plurality of parallel arc-breaking plates, a second surface opposite to the first surface, and at least a first through-hole,
wherein the terminal arc-breaking element comprises a cover of electrically insulating material coating, at least partially, the second surface of the plate portion, and wherein the cover comprises at least a second through-hole in fluid-dynamic communication with the at least the first through-hole of the plate portion in such a way that hot gases or plasma can pass through the plate portion and the cover, during operation of the switch pole.
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