LCVR/2 AC Voltage Monitoring Relay

  • Under and Over voltage monitoring
  • Monitors own supply
  • Selectable nominal voltages
  • Adjustable Trip levels
  • Adjustable Time delay
  • 2 x SPDT Relay output
  • 17.5mm wide, DIN Rail mount
  • UL Listed

When power is applied, output relays RLY1 and RLY2 will energise provided the monitored supply voltage is above the set Under voltage trip level and below the set Over voltage trip level.

Under voltage:
If the voltage decreases below the set Under voltage trip level, RLY2 will de-energise after the set delay. The voltage must increase above the trip level plus the set hysteresis setting before RLY2 will re-energise.

Over voltage:
If the voltage increases above the set Over voltage trip level, RLY1 will de-energise after the set delay. The voltage must decrease below the trip level minus the set hysteresis setting before RLY1 relay will re-energise.

    • Monitoring function: Under and Over voltage
    • Trip level: Under: 75 – 100%/Over: 100 – 125%
    • Hysteresis: ≈2% (fixed)
    • Time delay: 0.2 – 10s
    • Output: 2 x SPDT 5A @ 250V (AC1)
    • Dimensions(mm): W:17.5 x H:89 x D:66.5

Monitored supply voltage options*:
110/115V AC (Order Code: 99-3012)
220/230/240V AC (Order Code: 99-3002)

* To be specified when ordering

Distributors Stock Code Link
RS Components 1356187 (230VAC) Go to product
Farnell 2677820 (230VAC) Go to product

Typical applications include:

  • Electrical distribution control panels
  • Generator and transfer control panels
  • Machine supply supervision panels
  • Building services electrical panels

Key benefits:

  • Distinguishes supply fault types — Separate relay outputs allow undervoltage and overvoltage conditions to be passed to different control or alarm circuits.
  • Matches the equipment voltage limits — Selectable nominal voltage and adjustable trip levels allow the monitored window to be set for the connected single-phase supply.
  • Avoids reacting to brief deviations — An adjustable trip delay helps accommodate short voltage changes before the relevant output de-energises.
  • Responds to severe voltage collapse — The additional fixed undervoltage threshold cancels the delay and de-energises both relays when the supply falls sufficiently low.

Alternative product:

Icon: switch product
LXCVR AC Voltage Monitoring Relay
  • Under and Over voltage monitoring (Window)
  • Monitors own supply
  • Adjustable Trip levels
  • Adjustable Time delay
  • SPDT Relay output
  • 17.5mm wide, DIN Rail mount
  • UL Listed
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