PMD575 - 

The PMD575 provides protection for any 460-600 V three-phase system. The relay is energized and the LED is on when the phase sequence and all voltages are correct. Any one of the five fault conditions will de-energize the relay and provide fault indication with the LED.
Features:
Universal Voltage: One Unit Works on Any 460-600 V System
Adjustable Settings on Undervoltage (80-95% of Nominal), Time Delay on Undervoltage Trip and Start-Up and Phase Unbalance Setting (2-10%)
Choice of Automatic or Manual Reset
52.5 mm Din-Rail
Bi-Color LED Indicates Both Normal and Actual Fault Condition
Compatible with Both Wye and Delta Systems

Protects Against:
Phase Loss
Phase Reversal
Phase Unbalance
Undervoltage
Overvoltage

Specifications:
DPDT 10 A @ 277 VAC/30 VDC
Dimensions: 2.1" × 3.5" × 2.4"
Temperature: –28° to +65°C