How could I build a circuit that dectects if all of the three ac phases (127v) are present? I thought about measuring voltage between AC1+AC2, AC1+AC3 and AC2+AC3, this way it will even detect if the same phase is present on two terminals
Is it the more easy and realiable way?
It must be a compact solution
This will be used to trigger a relay to power a three phase ac motor only when the three phase are present. I know there are such protection devices on the market, but I would embed some other functionalities to a very specific application