Current limiting fuse having aluminum sulfate arc-quenching filler
First Claim
Patent Images
1. A current limiting fuse comprising:
- a fusible element; and
an arc quenching medium surrounding said fusible element, said arc quenching medium comprising aluminum sulfate.
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Accused Products
Abstract
A current limiting fuse construction including a fuse element extending between electrically conductive terminals carries a body of arc-quenching filler material within a hollow casing of electrical insulating material. The filler material includes a first portion of arc quenching aluminum sulfate mixed with calcium sulfate binder, and second portion of arc quenching silica sand arranged in stratified layers, with the aluminum sulfate layer being positioned closest to a weak spot of the fuse element, and the layer of silica sand being positioned closer to an end cap of the fuse casing.
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Citations
17 Claims
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1. A current limiting fuse comprising:
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a fusible element; and an arc quenching medium surrounding said fusible element, said arc quenching medium comprising aluminum sulfate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A current limiting fuse for interrupting an external direct current circuit comprising:
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a fusible element having a predetermined peak energy rating; and a predetermined amount of arc quenching medium surrounding said fusible element, said arc quenching medium including a predetermined amount of aluminum sulfate which absorbs heat energy from said fusible element during said interruption of said direct current, such that said fuse completely interrupts said direct current within a period of 30 milliseconds after an initial interuption of said direct current, without restriking after said 30 milliseconds. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A current limiting fuse comprising;
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a fusible element having at least one weak spot formed therein; an arc quenching medium including aluminum sulfate surrounding said weak spot of said fusible element; a stratified layer of sand surrounding said fusible element, adjacent said arc quenching medium.
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Specification