LXPRF Under Voltage Monitoring Relay

  • Under voltage monitoring
  • Monitors own three phase, 3-wire supply
  • Detects incorrect phase sequence and phase loss
  • Fixed Trip levels and Time delay
  • SPDT Relay output
  • 17.5mm wide, DIN Rail mount
  • UL Listed

The product monitors it’s own three-phase supply and for the output relay to energise, all phases must be present, the phase sequence correct and the phase to phase voltages above the fixed trip level. If any of these conditions are not met, the relay will de-energise.

  • Monitoring function: Under voltage
  • Monitored supply voltage: 280 – 520VAC (Order Code: 99-4008)
  • Under trip level: See min. working voltage
  • Hysteresis: ≈2%
  • Time delay: ≈ 100ms
  • Output: SPDT 8A @ 250V (AC1)
  • Dimensions(mm): W:17.5 x H:89 x D:66.5
Distributors Stock Code Link
RS Components 8505382 (280-520VAC) Go to product
Farnell 2677807 (280-520VAC) Go to product

Typical applications include:

  • Standard motor starter panels
  • Irrigation pump panels
  • Extraction and ventilation systems
  • Material-handling machinery

Key benefits:

  • Helps reduce low-voltage operation — Under-voltage monitoring releases the output relay when the monitored supply falls below the operating threshold, allowing equipment to be inhibited.
  • Helps prevent incorrect motor rotation — The relay requires correct phase sequence before energising, allowing a motor contactor to be inhibited when the incoming phases are reversed.
  • Helps avoid operation after phase loss — The output relay de-energises on phase loss, allowing an external contactor or control input to inhibit equipment on an incomplete supply.
  • Simplifies installation settings — Fixed trip and fault-delay settings remove user threshold adjustments where the documented operating limits suit the installation.

Alternative product:

Icon: switch product
LXPRT Phase Sequence / Failure / Under Voltage Monitoring Relay
  • Under voltage monitoring
  • Monitors own three phase, 3-wire supply
  • Detects incorrect phase sequence and phase loss
  • Adjustable Trip levels and Time delay
  • SPDT Relay output
  • 17.5mm wide, DIN Rail mount
  • UL Listed
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