Reddit reviews RC840T-120 - OEM Upgraded Replacement for Honeywell Aube Electromechanical Relay with 120v 24v Transformer
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This is a Brand New OEM Aube Electromechanical Relay with 120v 24v TransformerTop Quality OEM Replacement Part!
The US standard is 120vac but just about everything will work with Mexican voltages.
The North American version of Nest needs 24vac to operate. Others have gotten them to work with their fan coil systems using a transformer and relays.
Using on a single fan speed you can get a Aube RC840T-120 relay