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 1125437

ABSTRACT OF THE DISCLOSURE A varistor element is press-fitted into a recess formed in one surface of a metal electrode and protrudes a preselec- ted distance out from the electrode surface. A second metal electrode is positioned in line with but spaced from the varistor by a TEFLON* washer of selected thickness of fix the length of the air gap between the varistor and second elec- trode. The length of the copositioned air gap between the metal electrodes is similarly fixed by the washer and the protruding portion of the varistor. The assembly is held by a central rivet with a spring cup washer positioned under its peened and to hold elements in contact while absorbing some of the discharge force. The rivet is insulated by a nylon tube integral with an open-end cover for the assembly held at the closed end by the rivet head. When a high voltage surge is applied across the arrester assembly, the varistor-to-metal gap ionized quickly to initiate discharge. Ionization products of the initial discharge, plus the varistor resistance, trigger a shift of the surge discharge to the metal-to-metal gap to protect the varistor from damage by large energy surges. *trademark

347894

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