LXPRC Three Phase Voltage Monitoring Relay

  • Under and Over voltage monitoring (Window)
  • Monitors own three phase, 3-wire supply
  • Detects phase loss
  • Adjustable 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 and the phase to phase voltages within the set Under/Over trip levels. If any of these conditions are not met, the relay will de-energise. This product operates irrespective of phase sequence.

  • Monitoring function: Under/Over voltage
  • Trip level: Under: 75 – 95%/Over: 105 – 125%
  • Hysteresis: ≈2%
  • Time delay: 0.2 – 10s
  • Output: SPDT 8A @ 250V (AC1)
  • Dimensions(mm): W:17.5 x H:89 x D:66.5

Monitored supply voltage options*:
110VAC (Order Code: 99-4051)
220VAC (Order Code: 99-4052)
400VAC (Order Code: 99-4053)
* To be specified when ordering

Distributors Stock Code Link
RS Components 8505373 (400VAC) Go to product
Farnell 2677804 (400VAC) Go to product

Typical applications include:

  • Electric heating systems
  • Industrial power-supply panels
  • Generator output panels
  • Electrical distribution panels

Key benefits:

  • Helps protect against unsuitable supply voltage — Under and over voltage monitoring allows an external control circuit to inhibit equipment when the measured supply leaves the set voltage window.
  • Avoids phase-order restrictions — The relay operates irrespective of phase sequence, allowing voltage supervision where phase order is immaterial or checked separately.
  • 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.
  • Helps avoid unnecessary voltage-fault trips — An adjustable fault delay allows brief voltage deviations to be tolerated before the relay changes state, subject to the documented immediate-trip conditions.

Alternative product:

Icon: switch product
LXPRC/S Three Phase Voltage Monitoring Relay
  • Under and Over voltage monitoring (Window)
  • 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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