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. 30, 1982
Filed:
Dec. 31, 1979
Odo J Struger, Chagrin Falls, OH (US);
Allen-Bradley Company, Milwaukee, WI (US);
Abstract
A secondary, protective triac is connected in series with a main load-control triac in an a-c output circuit for a programmable controller. The two triacs are coupled to a pair of digital inputs and when the main triac is conducting the secondary triac is not conducting--unless the main triac stays 'on' after an 'off' signal is received, signifying a shorted main triac. If that occurs, a triac-failure fuse is blown and the secondary triac switches to conduct current and complete a virtually short circuit through a main power fuse. The blowing of the triac-failure fuse illuminates a neon bulb to give an indication of a main triac failure, and the blowing of the main power fuse illuminates a corresponding neon bulb to indicate a failure on the module and its disconnection from the load.