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Ancillary circuitry that protects the main circuitry in case of a fault. Examples of faults protected against are: overvoltage, ESD, overheating, and overloading (too high of a current draw). In some cases the protection circuitry is sacrificial, being destroyed or degraded in the act of protecting.

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Will relays benefit from protection in form of a flyback diode?

I am unable to add a comment as i am yet to gain more reputation 😅, hence i am using this section to add my thoughts. The internal circuit of a relay can be seen in the datasheet provided by OEM. If …
AbhishekMitra_AIT's user avatar