Direct current load breaking contact point constitution and...

Details Direct current load breaking contact point constitution and... Direct current load breaking contact point constitution and...

2005-08-23

2005-08-23

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

C361S115000

Reexamination Certificate

active

06934134

ABSTRACT:
The invention intends to provide a direct current load breaking contact point constitution that can make and break an electrical circuit under both direct current loads of direct current resistance load and direct current inductance load over a long period of time without causing problems such as {circle around (1)} the conduction defect due to the consumption of the contact point, {circle around (2)} the locking due to material transfer from one contact point to the other contact point, {circle around (3)} the welding between the contact points, and {circle around (4)} the abnormal arc continuation, and a direct current load breaking switching mechanism such as a relay, a switch and so on that has the contact point constitution. The direct current load breaking contact point constitution according to the invention comprises a movable contact point and a stationary contact point that face each other; wherein the movable contact point is made of AgSnO2In2O3alloy that contains at least Ag, 8 to 15% by weight in total of metal oxides including SnO2and In2O3, 6 to 10% by weight of SnO2and 1 to 5% by weight of In2O3; the stationary contact point is made of AgZnO alloy that contains at least Ag and 7 to 11% by weight of ZnO; and polarity of a movable side is (+) and that of a stationary side is (−).

REFERENCES:
patent: 4204863 (1980-05-01), Schreiner
patent: 4855104 (1989-08-01), Rothkegel et al.
patent: 5798468 (1998-08-01), Weise et al.
patent: 0 318 892 (1989-06-01), None
patent: 2 307 358 (1976-11-01), None
European Search Report dated Jun. 11, 2003, 4 pages.

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