Switching apparatus and activation suppression method for electr

Details Switching apparatus and activation suppression method for electr Switching apparatus and activation suppression method for electr

1997-11-18

1999-08-10

Donovan, Lincoln

High-voltage switches with arc preventing or extinguishing devic

Arc preventing or extinguishing devices

Interposed non-conductor

218155, H01H 3306, H01H 3360, H01H 932

Patent

active

059362170

ABSTRACT:
A switching apparatus wherein the life and the reliability of an electric contact are improved by fundamentally suppressing formation of black powder and activation of the surface of the contact by a chemical reaction. Microcapsules in which organic acid or organic acid precursor from which organic acid is produced as time passes is enclosed are placed into the internal space of an enclosed case so that organic compounds produced on and in the proximity of contact surfaces is oxidized with organic acid which escapes from the microcapsules and vaporized in the enclosed case without forming a film on the surfaces of the contacts to suppress activation of the surfaces of the contacts.

REFERENCES:
patent: 2231576 (1941-02-01), Grosse
patent: 2377866 (1945-06-01), D'Alelio
patent: 3222489 (1965-12-01), Chaikin
patent: 5352424 (1994-10-01), Howard et al.
patent: 5554963 (1996-09-01), Johler et al.

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