I think it's more than phase loss... it might be phase unbalance. These motors are on pumps that are reasonably loaded at start up (beam pumps). After an hour or so they will start tripping out. No all of them and not on over current. These is NO information although sometimes pushing the...
thread238-260801
These little buggers have a nasty habit of tripping and not showing why. I see SQ-D have an FAQ that gives a small glimpse into what's going on. I would not recommend these for new designs - particularly in remote unattended applications...