A diode connected across a coil will
- prevent the coil being fitted the wrong way.
- prevent back EMF and allow faster switching.
- suppress arcing when relay is opening and closing.
Explanation from PART66Online
A relay coil is inductive, so breaking its current produces a large back-EMF that arcs across the contacts. A diode connected across the coil gives the collapsing field a circulating path, clamping the spike and suppressing the arcing as the relay opens and closes, which also protects the switching contacts.
S
Storklubba asked · 19 Mar 2024
I think "prevent back EMF and allow faster switching" is the correct answer
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