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

The product is designed to monitor voltage across a load (for example). An auxiliary supply (required to power the unit) must be present for the product to function.

Two monitoring modes available:

Under voltage:
In normal operation, the relay is in the energised state (monitored voltage above the set trip level). When the voltage decreases below the trip level, the relay will de-energise after the set delay. The voltage must increase above the trip level plus the hysteresis before the relay will re-energise.

Over voltage:
In normal operation, the relay is in the energised state (monitored voltage below the set trip level). When the voltage increases above the trip level, the relay will de-energise after the set delay. The voltage must decrease below the trip level minus the hysteresis before the relay will re-energise.

  • Monitoring function: Under or Over voltage
  • Monitored voltage ranges: 2 – 20V, 5 – 50V, 10 – 100V, 20 – 200V or 50 – 500V AC/DC
  • Trip level: 10 – 100% of selected range
  • Hysteresis: 2 or 10%
  • Time delay: 0.1 – 30s
  • Aux. supply voltage: 24 – 230V AC/DC (Order Code: 99-3004)
  • Output: SPDT 8A @ 250V (AC1)
  • Dimensions(mm): W:17.5 x H:89 x D:66.5
Distributors Stock Code Link
RS Components 8505405 (24-230VAC/DC) Go to product
Farnell 2677812 (24-230VAC/DC) Go to product

Typical applications include:

  • Industrial electrical control panels
  • Battery banks and DC power supplies
  • Generator auxiliary circuits
  • Electrical equipment test benches

Key benefits:

  • Identifies unsuitable voltage — Selectable undervoltage or overvoltage monitoring changes the output when the measured voltage remains beyond the chosen trip level.
  • Adapts to the monitored circuit — Selectable input ranges and an adjustable trip level allow the voltage threshold to suit different circuits within the documented measurement limits.
  • Reduces repeated switching — Adjustable trip delay and selectable hysteresis help avoid reacting to brief voltage changes or repeatedly switching around the trip level.
  • Retains the fault response — The latch option can keep a tripped output state available after the measured voltage returns to normal.

Alternative product:

Icon: switch product
LMCVR-20V AC/DC Voltage Monitor Relay
  • Under or Over voltage monitoring (selectable)
  • 5 Selectable voltage ranges (1V, 2V, 5V, 10V or 20V)
  • 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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