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:
May. 03, 1988
Filed:
Oct. 20, 1986
Burkhard Tigges, Kirchhundem, DE;
Werner Turck GmbH & Co. KG, Halver, DE;
Abstract
A fault current circuit breaker for monitoring electrical circuits having a total current converter with a primary circuit including supply and return leads which are to be monitored and a secondary winding acting upon an electronic limiting value circuit which controls an electromagnetic retaining device. Switch contacts are provided for switching the circuit to be monitored when a predetermined fault current is exceeded. In order to enable self-monitoring, a current is briefly and periodically fed into an additional winding of the total current converter, with the current simulating a fault current, and a pulse voltage which appears at the output of the electronic limit value circuit due to the current in the additional winding is fed to an evaluation circuit, which causes the switch contacts to open in the absence of periodic pulses coming through the electromagnetic retaining device.