Device and method for monitoring the activity of processing units in an electric trip switch
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United States of America Patent
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Aug 18, 2020
Grant Date -
Mar 15, 2018
app pub date -
Sep 12, 2017
filing date -
Sep 15, 2016
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Abstract
A device for monitoring the activity of at least one first and one second processing unit fitted to an electric trip unit, each processing unit including a first activity-indicating circuit sending an activity signal to another processing unit and a monitoring circuit comparing a received activity signal with a reference signal. Each processing unit activates a first tripping circuit and/or an auxiliary output when the received activity signal is different from the reference signal. A circuit-breaker including such a monitoring device and a method for monitoring the operation of an electric trip unit including at least two processing units.
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