How do I know what relay I should use
Basic relay selection guide:

are you switching AC or DC? The requirements are very different. In this case it's low current DC.

is the switched current and voltage less than the contact rating? It looks like it

what is the &quot;pull in&quot; and &quot;hold&quot; of the coil? Usually the first is much larger, and your driving circuit has to be able to supply that much current.

Don't forget the flyback diode (may be included in this module, not clear)