Omron APR-S Phase Reversal Relay 200/220VOmron APR S Phase Reversal Relay 200 220V The APR S is a compact phase sequence monitoring relay designed to protect three phase motors and equipment from phase reversal conditions. Operating at 200 220V, this Omron unit detects incorrect phase rotation and triggers immediate disconnection to prevent motor damage and costly downtime. Built with reliable electromagnetic technology, it integrates seamlessly into control panels and automation systems.