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US 4,540,968 AGranted
Open fuse cutout
AssigneesNGK Insulators, Ltd., Takamatsu Electric Works, Ltd.
InventorsKazuaki Kato, Tomio Washizu
Life of this patent
Estimating the term…
Abstract
An open fuse cutout has a built-in lightning arrester. The open fuse cutout includes a supporting insulator with a protective cap fixed to an upper end thereof and containing the lightning arrester disposed laterally or vertically. The lightning arrester element has a charging electrode confronting an upper electrode across a first spark gap and a grounding electrode confronting a grounding member across a second spark gap.
Claims7
An open fuse cutout comprising:
- (a) a mounting member;
- (b) a supporting insulator supported on said mounting member;
- (c) first and second electrodes mounted on said supporting insulator;
- (d) a fuse tube extending between and supported on said first and second electrodes;
- (e) a protective cap fixed to an end of said supporting insulator;
- (f) a grounding member attached to said mounting member;
- (g) a lightning arrester element disposed in said protective cap and defining a first charging electrode and a grounding electrode, said charging electrode and said first electrode forming a first confronting pair and said grounding electrode and said grounding member forming a second confronting pair;
- and
- (h) at least one of said first and second confronting pairs having a spark gap.
6 more elements
Dependencies are inferred from the claim text.