High-voltage fuse

Claim 2

A high-voltage fuse including a a tubular casing of electric insulating material; b a pair of terminal plugs closing the ends of said casing; c a pulverulent arc-quenching filler inside said casing; d helically wound fusible element means conductively interconnecting said pair of terminal plugs and submersed in said filler, the turns of said fusible element means being arranged in the lateral surfaces of a prism having a predetermined number of edges; and e insulating strip means supported on the ends thereof by said pair of terminal plugs and supporting each of the turns of said fusible element at a number of points smaller than said predetermined number.

Claim 3

A high-voltage fuse as specified in claim 1 wherein said insulating strip means are of a synthetic resin evolving gas under the action of electric arcs.

Claim 4

A high-voltage fuse as specified in claim 1 wherein the turns of said fusible element means are arranged in the lateral surfaces of a prism having four edges and wherein said insulating strip means support each turn of said fusible element means at only two points angularly displaced 180*.

Claim 5

An electric high-voltage fuse including a. a tubular casing of electric insulating material; b. a pair of terminal elements closing the ends of said casing; c. a pulverulent arc-quenching filler inside said casing; d. a pair of strip-shaped fusible element supports of electric insulating material supported by said pair of terminal elements, said pair of fusible element supports being arranged parallel to and in spaced relation from the axis of said casing; and c. a helically wound fusible element arranged in the lateral surfaces of a four sided prism, each of the turns of said fusible element being supported by said pair of fusible element supports at two points only, the portions of each said turns situated between said two points being supported by said arc-quenching filler only in the absence of additional supporting means for said portions.

Claim 6

An electric high-voltage fuse including a. a tubular casing of electric insulating material; b. a pair of terminal elements closing the ends of said casing; c. a pulverulent arc-quenching filler inside said casing; d. a pair of strip-shaped fusible element supports of electric insulating material supported by said pair of terminal elements, said pair of fusible element supports being arranged parallel to and in spaced relation from the axis of said casing; and c. a helically wound fusible element arranged in the lateral surfaces of a four sided prism, each of the turns of said fusible element being supported by said pair of fusible element supports at two points only, the portions of each said turns situated between said two points being supported by said arc-quenching filler only in the absence of additional supporting means for said portions.

Claim 7

A sub-assembly for manufacturing high-voltage fuses including a. a pair of spaced coaxially arranged plug terminals; b. a plurality of rods projecting from the axially outer end surface of one of said pair of plug terminals transversely through said one of said pair of plug terminals into blind holes in the axially inner end surface of the other of said pair of plug terminals; c. a strip of electric insulating material arranged in parallel relation to said plurality of rods and having axially outer ends projecting into recesses in the axially inner end surfaces of said pair of plug terminals; and d. a fusible element wound helically around said plurality of rods and said strip of electric insulating material and conductively connected with the ends thereof to said pair of plug terminals.

Claim 8

A sub-assembly for manufacturing high-voltage fuses including a. a pair of spaced coaxially arranged plug terminals; b. a plurality of rods projecting from the axially outer end surface of one of said pair of plug terminals transversely through said one of said pair of plug terminals into blind holes in the axially inner end surface of the other of said pair of plug terminals; c. a strip of electric insulating material arranged in parallel relation to said plurality of rods and having axially outer ends projecting into recesses in the axially inner end surfaces of said pair of plug terminals; and d. a fusible element wound helically around said plurality of rods and said strip of electric insulating material and conductively connected with the ends thereof to said pair of plug terminals.

Claim 9

A sub-assembly for manufacturing high-voltage fuses including a. a pair of spaced coaxially arranged terminal plugs; b. a pair of strip-shaped fusible element supports of electric insulating material arranged parallel to and in spaced relation from the axis of said pair of terminal plugs at opposite sides of said axis and having axially outer ends projecting into blind recesses in the axially inner end surfaces of said pair of terminal plugs; c. a pair of metal rods arranged parallel to and in spaced relation from said axis of said pair of terminal plugs at opposite sides of said axis and angularly displaced 90* relative to said pair of fusible element supports, each of said pair of metal rods projecting from the axially outer surface of one of said pair of terminal plugs transversely through said one of said pair of terminal plugs into blind holes in the axially inner end surface of the other of said pair of terminal plugs.

Claim 10

A sub-assembly for manufacturing high-voltage fuses including a. a pair of spaced coaxially arranged terminal plugs; b. a pair of strip-shaped fusible element supports of electric insulating material arranged parallel to and in spaced relation from the axis of said pair of terminal plugs at opposite sides of said axis and having axially outer ends projecting into blind recesses in the axially inner end surfaces of said pair of terminal plugs; c. a pair of metal rods arranged parallel to and in spaced relation from said axis of said pair of terminal plugs at opposite sides of said axis and angularly displaced 90* relative to said pair of fusible element supports, each of said pair of metal rods projecting from the axially outer surface of one of said pair of terminal plugs transversely through said one of said pair of terminal plugs into blind holes in the axially inner end surface of the other of said pair of terminal plugs.