Electrical fuselinks
AssigneeDubilier PLC
InventorsRussell Brown, John D. Flindall
Life of this patent
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Abstract
An electrical fuselink having improved surge-resistant characteristics comprises a fuse element (1) disposed in an electrically insulating enclosure (4) having all or part of the air-space within the enclosure filled with a microporous or microcellular insulating material (2) which has low intrinsic thermal conductivity and cavities or cells of a size less than the average inter-molecular collision distance of the gas, normally air, occupying its cavities or cells. The fuse element is connected between electrical leads (3) which project from the enclosure for connecting the fuselink in an electrical circuit.
Claims7
In an electrical fuselink including a fuse element connected between terminal means and solid thermal insulating material arranged about said fuse element in a manner to reduce heat loss therefrom, the improvement which provides for further reducting heat loss from said fuse element and enhancement of the surge resistance thereof and which is characterised in that said insulating material includes a multiplicity of cavities having walls of said insulating material and occupied by gas, said cavities being sufficiently small in size so that the maximum distance apart of said walls of each said cavity is less than the mean free path of a molecule of said gas occupying said cavities.
Dependencies are inferred from the claim text.