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:
Mar. 31, 1981
Filed:
Oct. 06, 1978
Stanley E Zocholl, Holland, PA (US);
Gould Inc., Rolling Meadows, IL (US);
Abstract
A solid state relay for interrupting current flow in a power distribution circuit is disclosed. The relay includes a long time delay circuit which generates a first trip signal when the magnitude of the peak instantaneous line current rises above a pickup value I1 for a time period which varies as an inverse function of the magnitude of the peak instantaneous time current and which is determined by a first predetermined time current characteristic curve. The first predetermined time current characteristic curve defines the desired operating characteristic of the relay over a first current range extending between the pickup current I1 and the higher current I2. The predetermined time current characteristic curve is determined by a multi-node RC element in the feed back loop of an operational amplifier which forms part of the long time delay circuit.