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Phase monitoring relays protect against equipment failure caused by faults in three-phase systems, such as phase reversal, phase loss, phase unbalance, overvoltage, and undervoltage. These relays are compatible with Delta or Wye systems and are available in a range of voltage inputs.
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Phase Monitoring Relays
Category Selection
Dold and ProSense brand phase monitoring relays protect equipment from failure caused by phase/voltage faults including undervoltage, phase unbalance, and phase loss in three-phase AC systems. Select models provide voltage and neutral monitoring options for single-phase applications.
For part listings and specifications, go to Shop Now
ProSense PMR Series
ProSense phase monitoring relays protect three-phase systems from voltage and phase anomalies, are compatible with Wye or Delta systems, and are available in a range of voltage inputs.
- 10A contact rating
- Up to 600 VAC input voltage
- PMRU-TL series relays protect against phase loss, phase reversal, phase unbalance, undervoltage, and overvoltage for 3-phase systems from 190 VAC to 500 VAC
- PMRR-TL series relays provide phase reversal protection in a compact low-cost design; one relay will work on any 3-phase system from 190 VAC to 500 VAC
- PMRRL-TL series relays provide phase loss, phase reversal, and undervoltage protection for 208, 240, and 480 VAC systems
- PMRU-2C series true RMS relays protect against phase loss, phase reversal, phase unbalance, undervoltage, and overvoltage in most generator and other applications from 190 VAC to 600 VAC and with non-sinusoidal waveforms
- DIN rail mount or plug-in socket mount (sold separately), depending on model
Components starting at
$49.50
(PMRR-1C-480A-TL)
Dold VARIMETER Series
New!
Dold VARIMETER series phase monitoring relays provide early detection of phase unbalance, phase reversal, phase loss, overvoltage, undervoltage, and missing or broken neutrals in AC systems. They offer wide voltage measuring ranges, compact frame sizes, and integrated terminal bases. Simple single-turn switches allow quick and easy configuration without a complex menu structure.
- 80-230 VAC or 175-525 VAC measuring range
- Single- or three-phase AC voltage monitoring
- 5A SPDT output contacts
- Voltage, hysteresis, time delay, or monitoring function configuration options (depending on model)
- Select models offer enhanced phase loss monitoring
- Fast fault detection
- DIN rail mounting
Starting at
$121.00
(RN9877-1203P4W525V)
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