Arc chamber for a low-voltage switching device
AssigneeABB AB
InventorsPierantonio Arrighetti, Antonello Antoniazzi, Alessandro Adami, Daniele Torresin, Francesco Agostini
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Abstract
An arc chamber for a low voltage switching device including an insulating casing, having a first and a second lateral walls, a rear and a front wall, that defines an internal space housing a number or arc-breaking plates, a top wall of the casing having a discharge opening for venting off the gases from the internal space, the discharge opening being covered by a top cover. The arc chamber for a low voltage switching device includes a filter made of an open cell metal foam that is positioned at the discharge opening.
Claims20
An arc chamber for a low voltage switching device comprising an insulating casing, having a first and a second lateral walls a rear and a front wall, that defines an internal space housing a number of arc-breaking plates, a top wall of said casing having a discharge opening for venting off gases from said internal space, said discharge opening being covered by a top cover, wherein said top cover is entirely made of a filter comprising an open cell metal foam, and wherein said open cell metal foam of said filter has a thermal conductivity of lower than 10 W·m−1·K−1 to prevent said filter from melting said insulating casing when venting off said gases from said internal space.
Dependencies are inferred from the claim text.