Getter and electrical switching system using such getter

Details Getter and electrical switching system using such getter Getter and electrical switching system using such getter

H - Electricity

01

H

252/18, 306/45.1

H01H 9/04 (2006.01) H01H 1/64 (2006.01)

Patent

CA 1179311

Abstract of the Disclosure A getter for use in a sealed contact chamber consists of a porous getter material which acts to absorb substances which could create film resistances on electrical contacts. By disposing such a getter within the contact chamber of a switching device, such as an electromagnetic relay, molecules of, for instance, organic compounds, may by selectively and over long terms adsorbed to the getter and thus kept away from the contracts. The selective adsorption of such molecules is achieved by a porous getter material in which the majori- ties of the pores have diameters greater than 3 nm and smaller than 100 nm, with the mean value of pore diameter ranging from about 7 nm to about 20 nm. The getter material may be substantially Al2O3.

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