JohnO Posted June 11 Share Posted June 11 When the relay is closed, there would be 0V potential difference across the L and O terminals. So how does it stay powered on? Quote Link to comment Share on other sites More sharing options...
Members thgoebel Posted June 11 Members Share Posted June 11 (edited) In series to the relay contact is a MOSFET transistor arranged which augments its on-resistance at every zero-crossing of the consumer current. The small voltage drop generates enough energy to supply the processor. More details are to be found here: Click Edited June 11 by thgoebel 1 Quote Link to comment Share on other sites More sharing options...
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