The D65VMLS Voltage Monitoring Relay is a protective device for three-phase, Wye or Delta connected, power distribution networks supplying motor circuits. It may be installed in a motor feeder and control the supply to a number of motors or in a motor branch circuit to protect a single motor and its load. The D65VMLS automatically operates when one or more phases of the three-phase supply is lost, or when the phase sequence is reversed.

Each D65VMLS also responds to overcharge conditions (+10% fixed), a pre-selected under voltage threshold, and a pre-selected percent of phase imbalance. The percent phase imbalance is adjustable from 2-10% and the under voltage dropout can be set at 80-95% of the operating voltage. The adjustable time delay dropout on under voltage (0.3-30 seconds) eliminates nuisance tripping caused by momentary voltage fluctuations. There is also an adjustable time delay (1-300 seconds) on both power up and on restart after a fault has been cleared.

• Full-featured voltage/phase monitoring relays

• Undervoltage, overvoltage, phase imbalance, phase loss (single-phasing), phase reversal

• Universal voltage range of 208–480V provides the flexibility to cover a variety of applications; 120V and 600V units also available

• Automatic or manual reset after the fault condition is corrected

• User-adjustable settings include nominal voltage, percent phase imbalance, undervoltage drop-out, time delay on undervoltage and time delay on restart after fault

• Motor Control Protection Catalog (eaton.com)

• Spec Sheet 480V (eaton.com)