Patent ID: 7623326
Filing Date: 2009-11-24
Classification: H01F,H01H,H02H

Abstract:
1. A safety switching device for switching off an inductive load in a failsafe manner, the device comprising: a signal processing section for receiving and evaluating an input-sided switching-off signal, at least one first switching element, activated by the signal processing section, for switching off the load, a first threshold switch for limiting an inductive voltage to a predefined inductive voltage at the load during the switching-off, a monitoring circuit for monitoring the threshold switch, wherein the monitoring circuit is configured to generate an error signal when the inductive voltage drops below a threshold value, and at least one second threshold switch for limiting the inductive voltage to the predefined inductive voltage, the first and second threshold switches being arranged in such a manner that the magnitude of the inductive voltage is influenced by each of the threshold switches.