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Low Cost Phase Monitor Relays

Phase Monitor Relays (sometimes called 3 Phase Monitors, Phase Loss Relays, Protective Relays or Phase Failure Relays provide protection against premature equipment failure caused by voltage faults on 3 Phase systems. These devices are designed to be compatible with most Wye or Delta systems. In Wye systems, a connection to a neutral is not required. Phase Monitor Relays protect against unbalanced voltages or single phasing regardless of any regenerative voltages.

 

PCP Series Image
  • Protects against phase reversal
  • One unit (PCP2) works on any 208-480VAC system (separate 120V-only version is available)
  • LED indicates normal and fault conditions
  • Plug-in case

 

PLP Series Image
  • Protects against phase loss & phase reversal
  • Nominal voltages of 120, 208, 240, 400 & 480VAC
  • LED indicates normal and fault conditions
  • Plug-in case

 

PAP Series Image
  • Protects against phase loss, phase reversal and undervoltage
  • Nominal voltages of 120, 208, 240, 400 & 480VAC
  • User-selectable undervoltage settings
  • LED indicates normal and fault conditions
  • Plug-in case

 

PMP Series Image
  • Protects against phase loss, phase reversal, phase unbalance, undervoltage & overvoltage
  • One unit (PMDU) works on any system from 208-480V (separate 120V-only version available)
  • User-selectable phase unbalance & undervoltage settings
  • User-adjustable time delay drop-out on undervoltage & time delay on both power-up and restart after a fault
  • LED indicates normal and fault conditions
  • Choice of automatic or manual reset
  • Plug-in mounting style

 

PMD Series Image
  • Protects against phase loss, phase reversal, phase unbalance, undervoltage & overvoltage
  • One unit (PMDU) works on any system from 208-480V (separate 120V & 600V-only versions available)
  • User-selectable phase unbalance & undervoltage settings
  • User-adjustable time delay drop-out on undervoltage & time delay on both
  • power-up and restart after a fault
  • LED indicates normal and fault conditions
  • Choice of automatic or manual reset
  • Surface-mount style