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:
Feb. 04, 1992
Filed:
Dec. 03, 1990
Applicant:
Inventors:
Kazuhiro Ishii, Hiroshima, JP;
Hideaki Moriwaki, Hiroshima, JP;
Assignee:
Mitsubishi Denki K.K., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 94 ; 361 87 ; 340664 ;
Abstract
A circuit breaker having the overcurrent tripping characteristic, which is capable of detecting an overcurrent flowing through main circuit between an ac source and a load. The circuit breaker comprises a pre-alarm circuit having a pre-alarm characteristic, a pre-alarm signal output circuit for producing an alarm in response to the output of the pre-alarm circuit and a photocoupler for controlling the data transmission between the circuits. The circuit breaker can detect the main circuit current before it becomes an overcurrent and generate the alarm accurately.