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:
Aug. 14, 2012
Filed:
Feb. 07, 2007
Bardo Koppmann, Kaltenbrunn, DE;
Siegfried Neumann, Kümmersbruck, DE;
Ludwig Niebler, Laaber, DE;
Bernhard Streich, Amberg, DE;
Alf Wabner, Amberg, DE;
Norbert Zimmermann, Sulzbach-Rosenberg, DE;
Bardo Koppmann, Kaltenbrunn, DE;
Siegfried Neumann, Kümmersbruck, DE;
Ludwig Niebler, Laaber, DE;
Bernhard Streich, Amberg, DE;
Alf Wabner, Amberg, DE;
Norbert Zimmermann, Sulzbach-Rosenberg, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A protective device is disclosed for combination with an electrical switching device including a main current line or for integration in such a switching device. In at least one embodiment, the protective device includes a switching element and a switching apparatus, which is provided for the actuation of the switching element and is influenced by a current flow through the main current line. In at least one embodiment, in order to influence the switching apparatus, a current transformer is integrated in the main current line and an electrical resistance of a secondary winding surrounded by the current transformer can be measured. A method for operating a protective device is also disclosed wherein the switching apparatus is triggered so as to actuate the switching element if the measured resistance reaches or exceeds a predetermined or predeterminable threshold value.