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:
Jan. 23, 2007
Filed:
Jun. 07, 2001
Per Larsson, Vastersas, SE;
Magnus Backman, Vasteras, SE;
Lars Jonsson, Vasteras, SE;
ABB Group Services Center AB, Vasteras, SE;
Abstract
An apparatus for controlling an electric switching device () for alternating current arranged in a current path for opening the switching device and for breaking the current in the current path after occurrence of a fault current comprises members () adapted to detect the current in the current path and a unit () adapted to control the electric switching device to break the current in the current path directly after a half wave of the alternating current having a peak value below a predetermined current limit value, so that the breaking is completed through a zero-crossing of the alternating current terminating a said half wave.