LBVR/A Battery Voltage Monitor Relay

  • Under voltage monitoring in battery applications
  • Monitors own supply
  • Adjustable Trip level
  • Adjustable Time delay
  • SPDT Relay output
  • 17.5mm wide, DIN Rail mount
  • UL Listed

When power is applied, the output relay will energise if the monitored voltage is above the set trip level. When the voltage decreases below the set trip level the relay will de-energise after the set time delay period. The voltage must then increase above the trip level and plus the hysteresis setting before it will energise again.

  • Monitoring function: Under voltage
  • Supply voltage: 12 – 24V DC (Order Code: 99-3001)
  • Trip level: 9 – 28V DC
  • Hysteresis: 5% (fixed)
  • Time delay: 1 – 30s
  • Output: SPDT 8A @ 250V (AC1)
  • Dimensions(mm): W:17.5 x H:89 x D:66.5
Distributors Stock Code Link
RS Components 8505411 Go to product
Farnell 2522315 Go to product

Typical applications include:

  • Generator starting batteries
  • Battery-backed control panels
  • Mobile equipment auxiliary batteries
  • Standby DC power systems

Key benefits:

  • Identifies low battery voltage — The adjustable undervoltage trip level allows the relay output to signal when battery voltage remains below the selected threshold.
  • Reduces unnecessary alarms — An adjustable trip delay helps avoid reacting to brief battery-voltage dips during otherwise acceptable operation.
  • Simplifies battery supervision — The relay is powered by the battery supply it monitors, avoiding the need for a separate auxiliary supply.
  • Supports stable recovery — Fixed hysteresis requires voltage to recover above the trip level before the output re-energises, helping reduce repeated switching near the threshold.

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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