Macromatic's PMPU-FA8 3-phase line monitor is used in 190 to 500V three-phase systems to protect motors & equipment from 5 phase errors like phase loss, phase reversal, phase unbalance, undervoltage & overvoltage faults and rapid cycling. It can detect single-phasing & unbalanced voltages irrespective of regenerative voltages. This PMP Series voltage sensing relay continues functioning with a lost phase, unlike similar three-phase monitor relays for ease of troubleshooting.