LPMP/2 Three Phase Voltage Monitoring Relay

  • Under/Over voltage and asymmetry monitoring
  • Selectable nominals for popular 3-wire or 4-wire supply voltages
  • Detects incorrect phase sequence, phase and neutral loss
  • Adjustable Trip level and Time delays
  • DPDT Relay output
  • 17.5mm wide, DIN Rail mount
  • UL Listed

The product monitors it’s own three-phase supply and can be set for either 3-wire or 4-wire monitoring. For the output relay to energise, all phases (and neutral – if applicable) must be present, phase sequence correct and measured phase asymmetry/unbalance within the set limits. If any of these conditions are not met, the relay will de-energise. An adjustable restart delay allows the user to set a period of time before the relay is allowed to re-energise.

    • Monitoring function: Under/over voltage + asymmetry
    • Monitored supply voltages: (3-wire) 380V, 400V or 415VAC/(4-wire) 220V, 230V or 240VAC

(Order Code: 99-4201)

  • Fixed trip levels: Under: 90% / Over: 110%
  • Hysteresis: ≈2%
  • Time delay: 0.2 – 10s (Restart delay: 1 – 500s)
  • Output: DPDT 5A @ 250V (AC1)
  • Dimensions(mm): W:17.5 x H:89 x D:66.5

 

Distributors Stock Code Link
RS Components 1356182 (400VAC) Go to product
Farnell 2677817 (400VAC) Go to product

Typical applications include:

  • Industrial chiller installations
  • Wastewater pumping stations
  • Compressed-air plant
  • Process motor control panels

Key benefits:

  • Helps reduce exposure to supply unbalance — Adjustable phase-asymmetry monitoring can release the equipment control permissive when the measured voltage unbalance exceeds the selected limit.
  • Allows a controlled return to operation — The adjustable restart delay holds the relay de-energised after acceptable supply conditions return, giving the control circuit a deliberate recovery interval.
  • Responds to phase and neutral faults — Phase-loss detection and neutral-loss detection in the supported four-wire arrangement can release the control permissive when the incoming supply is incomplete.
  • Covers low and high voltage conditions — Fixed under/over-voltage limits complement phase-asymmetry monitoring, providing a common relay response to several unsuitable supply conditions.
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