Phase monitoring relays protect against equipment failure caused by faults in a 3-phase system, such as phase reversal, phase loss, phase unbalance, overvoltage and undervoltage. These relays are compatible with Wye or Delta systems and are available in a range of voltage inputs.
It's vital for 3-phase motors and other rotating equipment that the supplied voltage phases remain stable, balanced, and in the correct order. Several conditions can lead to unintended operation or failure.
Phase monitor relays protect against equipment failure caused by these types of voltage faults and are compatible with typical Wye or Delta systems, protecting against single phasing, even when regenerative voltages are present.
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