Three Phase Voltage Monitoring Relay RNPP-311M


Voltage AC 400 – 415V, 3-4 Pole, 5A, Under Voltage, Over Voltage, Phase Loss, Phase Imbalance, Phase Sequence protection with ON delay & OFF delay timer. Country of Origin: India

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RNPP-311M voltage monitoring relay is designed for protection of three phase loads against major types of mains faults, such as:

  • RMS voltage reaching beyond admissible thresholds – over and under voltage
  • Phase loss or Single phasing
  • Phase sequence order violation or reverse phase sequence
  • Phase coincidence or shorting of two or more phases
  • Phase Imbalance or asymmetry

The device performs monitoring of the main circuit parameters and de-energizes (trips) load when the parameters fall beyond specified boundaries.

The front panel LEDs display the following:

  • Presence of true RMS voltage in the mains
  • Load status (On/Off)
  • Type of fault

Adjustment potentiometers allow for setting:

  • Tripping threshold for the minimum/the maximum voltage, (% of the rated voltage)
  • Time delay for load re-energizing (reset) after the circuit parameters recovery
  • Tripping time delay for load de-energizing (trip) in case of all circuit voltage faults

With DIP switches on the device’s front panel the user can select the type of circuit monitored 400 / 415V, and turn on/off monitoring of the following circuit parameters:

  • Phase sequence
  • Phase imbalance or asymmetry
  • Under voltage
  • Over voltage

Corresponding combinations of the RNPP-311M switches allow for functioning in various modes:

  • Mode of circuit voltage comprehensive monitoring
  • Minimum/the maximum voltage monitoring mode
  • Minimum voltage monitoring mode
  • Maximum voltage monitoring mode
  • Phase presence monitoring mode
  • Phase sequence violation and phase coincidence monitoring mode
  • Phase imbalance monitoring mode; and other modes

The phase availability monitoring function is maintained in any position of the switches, including OFF position. The feature of 24V DC online power supply is available (optional).

Documentation for this device

Additional Information:

Additional information

Weight 0.200 kg
Dimensions 9.3 × 3.5 × 6.5 cm




Country of Origin


1 review for Three Phase Voltage Monitoring Relay RNPP-311M

  1. waifxnlz

    3 phase voltage monitoring

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