as David pointed out on the nameplate that I missed, 220/440 volts. You will only find 440-480 in three phase. I cani imagine this little motor 3 phase, but it could very well be, If you had people look at it, than it must be. I have never seen a three phase motor with a twist lock plug on it, Big surprise to you if you unplug that under load, that’s why you never use plug on three phase,But , anyways, they will straighten it out and you’ll be good to go.. Nice piece of equipment