Neon bubble anti-spark circuit

Select a neon bulb with a starting voltage greater than the relay operating voltage E and less than 400-500V and connect it to the contact S in parallel. When S
is disconnected and the voltage across the contact rises to zoo-500v, the neon bulb starts to discharge, thus preventing contact ablation. When the voltage
across S returns to the stable value E, the neon bulb goes out and blocks the leakage current.