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:
May. 20, 1980
Filed:
Apr. 10, 1978
Tibor Csizy, Budapest, HU;
Arpad Karpat, Budapest, HU;
Janos Melis, Budapest, HU;
Zoltan Szemerey, Budapest, HU;
Villamos Berendezes es Keszuvek Muvek, Budapest, HU;
Abstract
A fuse-element for electric fuses is shaped as a metal strip with one or more zones of diminished cross-section. The temperature rise conditions of the fuse-element and of its zones of diminished cross-section can be established and evaluated in combination and--based on these data--a fuse-element can be designed the temperature distribution characteristics of which include different local peak values and the spots where such peak values develop can be set in a manner that the whole fuse-element consists of two parts as far as the temperature distribution is concerned, i.e. a first part where this distribution is in accordance with a steady state distribution (the highest current value still failing to cause any melting), and a second part where the temperature rise distribution determines the character of the melting process, this being the so-called transient distribution characteristic. Such a design facilitates an essentially more exact setting of the rated currents and the desired melting time/current characteristics. The solution of this task, according to the invention, consists in that at least one of the zones of diminished cross-section, extending longitudinally along a part of the metal strip at which the operating temperature reaches relatively small values, is of a smaller cross-section than the remaining zones and exceeds the latter ones in length. The smallest cross-section is preferably arranged as a marginal zone, i.e. the zone is disposed next to one end of the fuse-element.