- De-energizing an unsuppressed 24V DC solenoid coil can generate an inverse voltage spike exceeding 1,000 volts.
- High-voltage back-EMF arcs across open relay contacts, degrading contacts and resetting nearby microprocessors.
- For DC coils, wire a 1N4007 diode reverse-biased across the coil; for AC coils, install a series RC snubber.
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