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. 31, 1990
Filed:
Jul. 07, 1988
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
307139 ; 307117 ; 3071 / ; 361115 ; 200 6102 ; 371 251 ;
Abstract
A circuit breaker for opening and closing contacts disposed on each phase of a multiphase electric power line has a photo-diode array and a light emitting diode array disposed on opposite sides of a driving rod of a driving mechanism, with a light passing aperture provided in the driving rod. When the aperture in the rod crosses the respective light paths between the photo-diodes and the corresponding light emitting diodes, the photo-diodes issue electric output signals corresponding to movement of the driving rod. By processing these output signals, any abnormal breaking of the breaker contacts among the phases is detected.