Fuse with overstoichiometric amount of oxidant
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United States of America Patent
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Feb 4, 2003
Grant Date -
Sep 6, 2001
app pub date -
Dec 8, 2000
filing date -
Dec 8, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fuse has a fuse element (6), composed of silver, with constrictions (7) which follow one another at regular intervals, and which fuse element makes contact with a combustible element (8), preferably over its entire length. The combustible element (8) is composed of a combustion compound, which is essentially of a fuel such as guanidine or a guanidine derivative and a metal such as Mg or Al and an oxidant such as KNO.sub.3, NaNO.sub.3, NH.sub.4 NO.sub.3, KClO.sub.4, NaClO.sub.4, KMnO.sub.4, the proportion of which is overstoichiometric by a factor of at least 1.1, and preferably of at least 10. The combustible compound also preferably contains a binding agent such as paraffin, a thermoplastic or an elastomer, so that it can be extruded. It has an ignition temperature of between 160.degree. C. and 260.degree. C. and emits more than 200 J/g of heat, so that it ignites even in the event of small overcurrents and melts the entire length of the fuse element (6).
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