Gas tube overvoltage protector with back-up gap

Details Gas tube overvoltage protector with back-up gap Gas tube overvoltage protector with back-up gap

H - Electricity

01

T

317/18

H01T 4/12 (2006.01) H01T 1/14 (2006.01)

Patent

CA 1172688

GAS TUBE OVERVOLTAGE PROTECTOR WITH BACK-UP GAP Abstract of the Disclosure A gas tube overvoltage protector has two opposed electrodes sealed in a tubular dielectric housing, the outer ends of the electrodes extending from the housing. The inner ends of the electrodes define a primary gap at sub-atmospheric pressure. The lower electrode has an extension of reduced diameter on its outer end. An auxiliary gap is formed by pushing on a metal cap over the lower end of the dielectric housing, with a thin flexible dielectric member between the cap and the outer end of the bottom electrode, the extension extending through the dielectric member and cap. One or more apertures in the thin dielectric member define the auxiliary gap, between metal cap and bottom electrode. A further feature is that the cage, within which the protector is positioned, has one or more legs preformed such that their lower ends are pushed into positive contact with the metal cap when assembled into a closed ended hollow cap for assembly into a protector block. - i -

408012

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