Electrical contact tip for switching applications and an electrical switching device
AssigneeABB Schweiz AG
InventorsGunnar Johansson, David Karlén, Erik Johansson, Reinhard Simon
Life of this patent
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Abstract
An electrical contact tip for switching applications. The contact tip includes a body having a first layer and a second layer. The first layer arranged on the second layer and adapted to come in contact with a corresponding contact tip during switching operations. The first and second layers consist of Ag-composites of one or more elements, compounds or alloys, where the hardness of the first layer is lower than the hardness of the second layer.
Claims13
An electrical contact tip for switching applications, the contact tip comprising:
- a body having a first layer and a second layer, the first layer is arranged on the second layer and is configured to come in contact with a corresponding contact tip during switching operations, wherein the first layer and the second layer are each made of a sintered Ag-composite, the Ag-composites of the first layer and the second layer each having an Ag-matrix with impurities and one or more elements, compounds, or alloys distributed in the Ag-matrix, wherein the hardness of the first layer is lower than the hardness of the second layer, wherein the thickness of the first layer is between 10% and 40% of the thickness of the second layer, and wherein the Ag-composite of the first layer comes into or out of contact with the corresponding contact tip to provide bypass-isolation switching, and when the first layer is worn off, the Ag-composite of the second layer comes into or out of contact with the corresponding contact tip to provide load switching.
An electrical switching device comprising an electrical contact tip including:
- a body comprising a first layer and a second layer, the first layer is arranged on the second layer and is configured to come in contact with a corresponding contact tip during switching operations, wherein the first layer and the second layer are each made of a sintered Ag-composite, the Ag-composites of the first layer and the second layer each having an Ag-matrix with impurities and one or more elements, compounds, or alloys distributed in the Ag-matrix, wherein the hardness of the first layer is lower than the hardness of the second layer, wherein the thickness of the first layer is between 10% and 40% of the thickness of the second layer, and wherein the Ag-composite of the first layer comes into or out of contact with the corresponding contact tip to provide bypass-isolation switching, and when the first layer is worn off, the Ag-composite of the second layer comes into or out of contact with the corresponding contact tip to provide load switching.
Dependencies are inferred from the claim text.