Contactor wiring diagram - auto transfer switch (single Phase)

How to wire a single phase contactor with an auto switch between two power sources Main and Backup to one load output with a full diagram.
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[@MI_44177]

very underrated video
thank you its useful

[@junaidshamsoodien4564]

Nice vid, but could you please label L and N ?

[@TripleRRS72]

Nice video, please what kind of contactor is this? I want to use two different power source so what kind of contactor should I buy?

[@salammahmood6037]

Excellent explanation. But the music is loud.