Fuse wire assembly for electrical fuse
AssigneeLittelfuse, Inc.
InventorSeibang Oh
Life of this patent
Estimating the term…
Abstract
A core assembly having a flexible insulating material core and a spirally wound inner fuse wire engages with one or more elongate bodies of the flexible insulating material to sandwich and compress the inner fuse wire therebetween. An arc burning between the blown ends of the inner fuse wire will be blocked and quenched by the core and body insulating materials expanding or moving into the space where the arc subsists and is burning away a portion of the inner fuse wire. An outer fuse wire, an outer wrapper of shrinkable tubing or twisting together the core assembly and the elongated body or bodies retains the core assembly and insulating body or bodies engaged along their length and forms a fuse wire assembly.
Claims30
A fuse wire assembly for suspension between and connection to a pair of spaced end cap terminals of an insulating cylindrical housing, said fuse wire assembly comprising:
- A. an elongated core assembly including an elongate core of insulating material and an inner fuse wire spirally wound on the core at a first pitch;
- and
- B. at least one body of flexible insulating material retained against said core assembly to engage against said inner fuse wire at plural locations along the length of said core assembly and sandwich said inner fuse wire between said core and body at said plural locations, so that an arc burning away a portion of said inner fuse wire between blown ends of said first fuse wire can be quenched by at least said insulating material of said body moving into the space where said arc burned away-said portion of said first fuse wire and said arc subsists.
A fuse wire assembly for suspension between and connection to a pair of spaced end cap terminals of an insulating cylindrical housing, said fuse wire assembly comprising:
- A. an elongated core assembly including an elongated substantially cylindrical core of flexible insulating material formed of an initially limp and substantially dead yarn made of twisted together strands of insulating filaments substantially devoid of filament binding material capable of forming a conductive path under fuse blowing conditions, and a inner fuse wire spirally wound therearound a number of times at a first pitch;
- B. an elongated body of said insulating material extending substantially rectilinearly along and engaged against substantially the length of said core assembly particularly to engage against said inner fuse wire at plural locations along said core assembly to sandwich and compress said inner fuse wire between said core and body of insulating materials;
- and
- C. an outer fuse wire spirally wound around said core assembly and said elongated body a number of times at a second pitch to maintain said elongated body against said core assembly and compress said inner fuse wire between said core and body so that an arc burning away a portion of said inner fuse wire between blown ends thereof can be quenched by the core and body insulating material moving into the space where said arc burned away said portion of said inner fuse wire and where said arc subsists.
A fuse wire assembly for suspension between and connection to a pair of spaced end cap terminals of an insulating cylindrical housing, said fuse wire assembly comprising:
- A. an elongated core assembly including an elongated substantially cylindrical core of flexible insulating material formed of an initially limp and substantially dead yarn made of twisted together stands of insulating filaments substantially devoid of filament binding material capable of forming a conductive path under fuse blowing conditions, and an inner fuse wire spirally wound therearound a number of times at a first pitch;
- B. an elongated body of said insulating material engaged against substantially the length of said core assembly particularly to engage against said inner fuse wire at plural locations along said core assembly where said inner fuse wire is sandwiched between said core and body of insulating materials;
- and
- C. one of said core assembly and said elongated body being spirally wound around the other to compress said inner fuse wire between said core and body so that an arc burning away a portion of said inner fuse wire between blown ends thereof can be quenched by the core and body insulating material moving into the space where said arc burned away said portion of said inner fuse wire and where said arc subsists.
Dependencies are inferred from the claim text.