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:
Apr. 19, 1983
Filed:
Mar. 17, 1981
Applicant:
Inventors:
Pierre Demeyer, Uriage, FR;
Paul Claudin, Grenoble, FR;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ; H02H / ;
U.S. Cl.
CPC ...
361 96 ; 361 44 ; 361100 ; 361101 ;
Abstract
The invention concerns a solid state trip unit having long time delay, short time delay and ground fault trip circuits. It comprises a metering resistor (40) electrically connected in a series circuit (42) including additionally a power supply (44) for the trip circuits LR, CR and H, and a trip coil (22). A switch (52) connected in parallel with the coil (22) which may be either in an ON-state to shunt the coil (20), or in an OFF-state after a trip signal is delivered from one of the trip circuits, so as to cause an increase of the impedance of the series circuit (42) and the excitation of the trip coil (22). The trip unit can be applied to low-voltage circuit breakers.