Silver-based contact material for switchgear used in power engineering
AssigneeSiemens Aktiengesellschaft
InventorsFranz Hauner, Manfred Muller, Gunter Tiefel
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Abstract
Substitute materials are increasingly proposed for contact pieces in low-voltage switches, which until now frequently consisted of silver-nickel. In the case of such a substitute material which, besides silver, contains at least iron oxide (Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4) and zirconium oxide (ZrO.sub.2) as active components, the making capacity with regard to the critical welding current is improved by an addition of a further oxide of the sixth subgroup of the Periodic System and/or of a mixed oxide that consists of iron oxide and the oxide of an element of the sixth subgroup of the Periodic System. In this connection, the further additive is, in particular, ferro-wolframate (FeWO.sub.4).
Claims8
A silver-based contact material for switchgear used in power engineering, comprising:
- silver;
- iron oxide and zirconium oxide (ZrO.sub.2) as active components;
- and an oxide of an element of the sixth subgroup of the Periodic Table or a mixed oxide of iron and an element of the sixth subgroup of the Periodic Table.
Dependencies are inferred from the claim text.