The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 2004
Filed:
May. 30, 2002
Uwe Kaltenborn, Baden-Dättwil, CH;
Lutz Niemeyer, Birr, CH;
ABB Research Ltd, Zurich, CH;
Abstract
In a fuse chamber ( ) there is arranged as a quenching gas source a burn-off element ( ), which concentrically surrounds an arc chamber ( ) and is separated from it by a fuse element ( ), which consists of metal foil, preferably silver foil, and the outer side of which is adjoined by the burn-off element ( ). The latter consists of an igniting material ( ), arranged in the form of a ring running around centrally, and a gas-evolving material ( ). Both materials consist, for example, of guanidine or guanidine derivatives as the combustible material and an oxidant, the proportion of which in the igniting material ( ) is hyperstoichiometric. The arc chamber ( ) is bounded at opposite ends by nozzles ( ), which connect it to exhaust volumes ( ). When there is an overcurrent, the fuse element ( ) heats up to the igniting temperature of the igniting material ( ) and is torn open centrally. The arc forming is axially blown by the quenching gas, which forms during the burning-off of the burn-off element ( ), and quenched. The fuse element ( ) may centrally have a triggering zone, where it is more easily interruptible, in particular meltable. The quenching gas source may also comprise compressed-gas tanks or cold-gas generators.