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Compound contact with higher welding resistance and high arc burning loss resistance

An arc burn-resistant, composite contact technology, used in circuit breaker contacts, circuit breaker parts, etc., can solve the problems of high resistivity, high price of silver alloy contacts, and temperature rise.

Inactive Publication Date: 2017-01-25
沈阳新同正复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the resistivity is high, the contact resistance increases due to the oxidation of the tungsten phase particle surface after breaking, and the temperature rises, and the electrical life is not long
And the price of silver alloy contacts is very high

Method used

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  • Compound contact with higher welding resistance and high arc burning loss resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The composite contact is composed of a silver alloy contact layer 1 and a copper alloy contact layer 2; the silver alloy contact layer 2 accounts for 10% of the thickness of the composite contact.

[0016] The specific composition and weight ratio of the silver alloy contact layer 1: molybdenum 5%, diamond 1%, silver balance.

[0017] The specific composition and weight ratio of the copper alloy contact layer 2: molybdenum 5%, graphite 4%, copper balance.

[0018] Installed on a small residual current protective circuit breaker for form test, test results

[0019] Running break breaking capacity 6 thousand amperes

[0020] Electrical life 3000 times

[0021] Temperature rise <60K after test.

Embodiment 2

[0023] The composite contact is composed of a silver alloy contact layer 1 and a copper alloy contact layer 2; the silver alloy contact layer 1 accounts for 20% of the thickness of the composite contact.

[0024] The specific composition and weight ratio of the silver alloy contact layer 1: molybdenum 15%, diamond 4%, silver balance.

[0025] The specific composition and weight ratio of the copper alloy contact layer 2: molybdenum 10%, graphite 10%, copper balance.

[0026] Installed on a small residual current protective circuit breaker for form test, test results

[0027] Running break breaking capacity 10,000 amperes

[0028] Electrical life 4000 times

[0029] Temperature rise <60K after test.

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PUM

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Abstract

The invention relates to a compound contact with higher welding resistance and high arc burning loss resistance. The compound contact is characterized by comprising a silver alloy contact layer and a copper alloy contact layer; the silver alloy contact layer is composed of the following components by weight percent: 1-20% of yttrium oxide, 1-10% of diamond and the balance of silver; and the copper alloy contact layer is composed of the following components by weight percent: 1-50% of molybdenum, 1-20% of graphite and the balance of copper. The compound contact provided by the invention has high welding resistance, high breaking capacity and obviously improved arc burning loss resistance.

Description

technical field [0001] The invention relates to a low-voltage electrical contact, in particular to a composite contact with stronger resistance to welding and arc burnout. Background technique [0002] Residual current protection circuit breaker is a kind of low-voltage electrical appliance that protects personal safety in the electrical circuit. This electrical appliance is more and more widely used in various industrial and civil buildings. In particular, the application of small residual current protection circuit breakers is very large. Residual current protective circuit breakers have high requirements on contacts. The contacts are required to have high resistance to fusion welding and the ability to withstand high-current arc burnout. At present, the small residual current protection circuit breaker uses Ag-Wu50 (silver + tungsten 50%) as the moving contact, and Ag-WC12-C3 (silver + tungsten carbide 12% + carbon 3%) as the asymmetric contact pairing of the static con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H73/04
CPCH01H73/04
Inventor 孔琦琪石钢
Owner 沈阳新同正复合材料有限公司
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