Phase and Voltage Monitoring Relays Offer Accurate Measurements

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The PMRU-2C series prevents equipment damage from multiple threats.

The PMRU-2C series true RMS phase monitor relays protect 3-phase equipment from damage that can occur when there is a phase loss, phase reversal, phase unbalance, undervoltage or overvoltage condition. These relays are designed to provide protection for most generator systems and applications that use non-sinusoidal waveforms. With non-sinusoidal waveforms, the true RMS voltage measurement ensures accurate sensing, eliminating nuisance tripping.

Also added are voltage monitor relays for AC single-phase (50 to 60 Hz) or DC circuits to protect equipment from voltage faults. Over/under voltage relays, with fixed or adjustable time-delay drop-out, offer protection from over-or under-voltage conditions. Voltage band relays protect equipment required to operate within an upper and lower voltage limit. The relay is energized if the monitored voltage remains within the adjustable range.

AutomationDirect

Phase and Voltage Monitoring Relays Offer Accurate Measurements