Voltage Line Monitoring Relays, VMR 3P For Three Phase Systems, Phase Failure Relays, Reverse Phase Protectors, Single Phase Protectors Or Preventers, Digital Voltage Protection Relays, Digital Voltage Monitoring Relays, Digital Voltage Measuring Relays, Over And Under Voltage Protection Relays, Over And Under Voltage Monitoring Relays, Over And Under Voltage Measuring Relays, Over And Under Voltage Protection Relays, Three Phase Over And Under Voltage Protection Relays, Three Phase Over And Under Voltage Monitoring Relays, Three Phase Over And Under Voltage Measuring Relays, Manufacturer, Supplier, Exporter, Proton Power Control, Pune, Maharashtra, India

Voltage Monitoring Relay PR 07

Protection of 3 Phase devices against Over voltage, Under voltage,Single Phasing, Reverse Phasing & unbalance supply are one of the major issue in electrical systems. For safe running of 3-phase devices, special protections that keep a continuous watch on supply conditions are very essential. The major cause of maximum load burn-out is overloading which occurs due to unbalance supply, Single Phasing & Reverse Phasing conditions. VMR3P detects such Conditions & protect the load from burn out. PROTON's VMR 3P' offer above protections along with 3 digit display showing R-Y,Y-B,BR voltages in scanning mode with precise accuracy. LOW/HIGH voltage tripping to ensure trouble free running of 3-phase Loads.

  • Supply Voltage: 3 Phase 415 VAC,50 Hz (R,Y,B &N) (No auxilliary supply)
  • Output Contacts: Two changeover ( C-NO),Rating 5A at 230VAC
  • Voltage trip setting :
    Lower Limit is 340 for Under voltage (Resolution of 1 Volt)
    Upper Limit is 460 Volts for OV (resolution of 1 V)
    ( Hysterisis between cut off & cut in is 10V)
  • Trip Time delay: Trip time less than 100 msec.for SPP, Reverse Phasing & Over VoltageTrip Time is settable for Under Voltage & Unbalance.
  • ON Delay: Selectable by keys from 1 to 60 sec.
  • Reset Mode: Auto reset.
  • Indications:
    1. SPP : RED LED
  • Operating Temperature range: -5 0C to 60 0C.
  • Relative Humidity:10% to 95%
  • Mounting:
    Din rail:
    Base mounting dimensions 55 (W) x 65 (H) x 125 (D) mm.


  • Micro controller based technology.
  • Voltage protection along with digital voltage readout.
  • Wide range of supply variation.
  • Unit will also work if any one phase is present.
  • Protection against Under voltage.
  • Protection against Over voltage.
  • Single Phasing & Reverse Phasing protection.
  • All the set points stable by keys.
  • Trip Delay for Under voltage & Unbalance is stable.
  • Reverse Phasing Protection can be able to bypass through settings.
  • Indications for Low voltage , High Voltage, SPP & Relay ON .
  • Message Display for SPP, Reverse Phasing & Unbalance Faults.
  • No separate auxiliary supply required.
  • Hold feature: Press INC key in Running condition to observe particular supply voltage.

  • In the normal run mode, display shows Voltage Vrn.
  • If the supply is within the range then timer indication blinks for time set in the set point & after that Relay will be ON.
  • If Over voltage,Under voltage in the supply then Relay will be OFF & corresponding fault LED starts blinking.
  • Hysterisis betwen Cut off & cut in is 10V
  • 1. Under voltage
    2. Over voltage
    3.On Time for Relay
    Procedure to view/change the set point:
  • To view the set point, press FN key.
  • Function Mode Message"Fun" will flash 3 times & then message ""uV" will flash three times & after that Under voltage set point will be displayed
  • User can view set points one by one like that.
  • But if user wants to change the set point, he has to enter correct password which is 11(Factory set) with the help of arrow keys.
  • Password will flash on display.If Password is correct, message "YES" will be displayed.
  • User will now able to access & change set points by pressing FN & arrow keys.
  • If Password is incorrect,message"no" will be displayed & Display will come out to run mode.
  • Setpoint will be saved by pressing FN key .
  • Important Note: User has to enter password within timelimit otherwise display will come out run mode quickly.
  • After set point entered,the system goes into Run mode automatically after 5 sec.

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