Protective electrical discharge device

Details Protective electrical discharge device Protective electrical discharge device

H - Electricity

01

L

356/114, 317/24

H01L 49/00 (2006.01) H01C 7/12 (2006.01) H01T 1/16 (2006.01)

Patent

CA 1125438

(Case No. 7011) ABSTRACT OF THE DISCLOSURE A varistor disc is press-fitted into recesses formed in opposite surfaces of two metal electrodes, its length selected so that a predetermined air gap remains between the electrode surfaces in parallel to the varistor path. The assembly is held by a vivet inserted through the three elements with a spring cup washer under the peened rivet end to absorb dynamic discharge forces. The rivet is insulated by a nylon tube integral with a dust and moisture cover, held at one end by the rivet head and open at its other end for release of gas and particles upon discharge. The varistor dissipates static voltage buildup and low voltage surges. High voltage causes arcing between varistor and electrodes within the air gap, which creates a surge discharge across the air gap between electrodes to dissipate surge energy and protect the varistor element.

347895

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