Arrangement of automatically restoring normal operation of latch-in relay.

摘要

In order to automatically restore a normal switching position of a relay, armature from an accidental OFF switching induced by external impact or the like, the output of the relay is monitored and is applied to a differentiating circuit. A comparator is provided to reflect on and off operations of a main switch. In the event that the output of the relay falls suddenly, the differentiating circuit outputs a pulse to a wave-shaping circuit (e.g., Schmitt trigger). An gate circuit is supplied with the outputs of the wave-shaping circuit and the comparator. The output of the gate circuit momentarily allows a relay driver to actuate the relay in response to the undesired change in relay status, and hence the relay armature resumes ON switching position.