Contact construction for DC loads and switching device...

Details Contact construction for DC loads and switching device... Contact construction for DC loads and switching device...

2006-03-14

2006-03-14

Donovan, Lincoln (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Polarity-responsive

C200S265000

Reexamination Certificate

active

07012492

ABSTRACT:
A contact construction and switching device for DC loads that can be repeatedly used while minimizing problems such as cut-off failure, locking and deposition due to an abnormal continuation of an arc between the contacts, burning and destruction of the contacts, and an increase in contact resistance has a construction that includes a stationary contact and a movable contact that are opposite to each other, and a magnetic unit which applies a magnetic field orthogonal to the moving direction of the movable contact. In the contact construction, the anode-side contact is made of an AgSnO2-based alloy which contains at least Ag and SnO2, and the cathode-side contact is made of one of an AgNi-based alloy which contains at least Ag and Ni and an AgCuO-based alloy which contains Ag and CuO. The switching device has the above-mentioned contact construction.

REFERENCES:
patent: 4050930 (1977-09-01), Motoyoshi et al.
patent: 4817695 (1989-04-01), Wingert et al.
patent: 4846901 (1989-07-01), Lima et al.
patent: 5546061 (1996-08-01), Okabayashi et al.
patent: 6831533 (2004-12-01), Sato et al.
patent: 4024939 (1992-02-01), None
patent: 59-70741 (1984-04-01), None

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