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:
Jul. 20, 2004
Filed:
Apr. 08, 2002
Norbert Elsner, Bubenreuth, DE;
Gerd Griepentrog, Gutenstetten, DE;
Reinhard Herbst, Wernberg-Koeblitz, DE;
Reinhard Maier, Herzogenaurach, DE;
Norbert Mitlmeier, Ursensollen, DE;
Diethard Runggaldier, Stegaurach, DE;
Christian Schreckinger, Koetzting, DE;
Bernhard Streich, Amberg, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
An electromagnetic switching device includes a contact arrangement with three contacts which couple a three-phase load to three phases of a three-phase power supply system, and disconnect the three-phase load from the three phases. Switching erosion takes place on the contacts. An overall erosion is determined for each contact, and is supplied to a drive circuit. The contact arrangement is operated by the drive circuit as a function of the overall erosion such that the overall erosion of the contacts are approximated to one another.