I have a DC motor running at 250V DC and it has a thermister switch wound into the windings. The Thermister circuit is fed 24V DC and the return sets an input in a PLC.
On two occasions now, 250V DC has fed back into the 24V DC circuit causing catastophic failure of most 24V DC componants.
What can I use as a safety circuit or voltage blocking device to protect the 24v DC circuit in the event of 250V DV being fed onto it?
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