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:
Sep. 06, 1988
Filed:
Feb. 19, 1987
Robert E Houf, Glendale, WI (US);
Sydney W Frey, Jr, Brookfield, WI (US);
Richard D Marasch, Germantown, WI (US);
Edwin J Wroblewski, Cudahy, WI (US);
Allen-Bradley Company, Inc., Milwaukee, WI (US);
Abstract
An electric load controller having a modular construction with the logic circuitry located in an enclosure. This circuitry comprises a microprocessor, I/O interface and a memory for storing the computer program to be executed by the microprocessor. The control logic supplies signals via the I/O interface to a set of three modules which switch the three phase electric current to the load. The switch modules each having a separate enclosure containing thyristors which apply the electricity to the load in response to control logic signals. The switch modules are mounted on a heat sink and the logic circuit enclosure is mounted on the switch modules. A protection circuit module may be included that provides a metal oxide varistor and a capacitor connected across each phase of the electric power.