LMWVR AC/DC Voltage Monitoring Relay

  • Under and Over voltage monitoring (Window)
  • 7 Selectable nominal voltages (12V, 24V, 48V, 110V, 115V, 230V or 240V)
  • Adjustable Trip levels
  • Adjustable Time delay
  • Isolated Auxiliary supply
  • SPDT Relay output
  • 17.5mm wide, DIN Rail mount
  • UL Listed

The product is designed to monitor a nominal voltage on a separate supply and ensure it stays within the set limits. An auxiliary supply (required to power the unit) must be present for the product to function. When the monitored voltage is applied the relay will energise.

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

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

    • Monitoring function: Under and Over voltage
    • Monitored nominal voltages : 12V, 24V, 48V, 110V, 115V, 230V or 240V AC/DC
    • Trip level: Under: 70 – 90%/Over: 105 – 130% (of selected nominal voltage)
    • Hysteresis: ≈2%
    • Time delay: 0.1 – 30s
    • Aux. supply voltage: 24 – 230V AC/DC

(Order Code: 99-3005)

  • Output: SPDT 8A @ 250V (AC1)
  • Dimensions(mm): W:17.5 x H:89 x D:66.5

 

Distributors Stock Code Link
RS Components 8505418 (24-230VAC/DC) Go to product
Farnell 2677814 (24-230VAC/DC) Go to product

Typical applications include:

  • Battery-backed control systems
  • Industrial power-supply panels
  • Telecommunications DC power panels
  • Building automation control panels

Key benefits:

  • Checks both voltage limits — Simultaneous undervoltage and overvoltage monitoring changes the output if the measured supply leaves the selected voltage window.
  • Separates monitoring from relay power — An isolated auxiliary supply powers the relay independently of the circuit being measured.
  • Suits different control supplies — Seven selectable nominal voltages and adjustable trip levels allow the monitoring window to suit common AC and DC control supplies.
  • Reduces unnecessary interruptions — Adjustable trip delay and fixed hysteresis help avoid responses to brief voltage changes and repeated switching near a limit.

Alternative product:

Icon: switch product
LMCVR-500V AC/DC Voltage Monitor Relay
  • Under or Over voltage monitoring (selectable)
  • 5 Selectable voltage ranges (20V, 50V, 100V, 200V or 500V)
  • Adjustable Trip level, Hysteresis and Time delay + Latch
  • Isolated Auxiliary supply
  • SPDT Relay output
  • 17.5mm wide, DIN Rail mount
  • UL Listed
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