Product Details:

Voltage TypeAC
Voltage (V)240/415
Number of Poles3 Pole & 4 Pole
ApplicationThree Phase Voltage & Contactor Output Monitoring
Current (Amps)5A @ 250V AC
Contact FormSPDT (1NO + 1NC)
TypeUnder voltage, Over voltage, Phase loss, Phase imbalance, Reverse phase sequence protection & Output monitoring

RNPP-301 voltage monitoring relay is designed for protection of three-phase loads against major type of mains faults, as:

  • RMS voltage reaching beyond admissible thresholds
  • Phase sequence order violation and phase coincidence
  • Violation of the mains voltage phase completeness and symmetry

The device performs monitoring the main circuit parameters and de-energizes load when the parameters fall beyond specified boundaries. The relay also tracks the status of magnetic starter power contacts at no-load and under load while monitoring their operability (burning or sticking).

The front panel LEDs display the following:

  • Presence of voltage in the mains
  • Load status (ON/OFF)
  • Type of fault

Six variable pot knobs on the front panel allow for setting:

  • The maximum allowable voltage tripping threshold
  • The minimum allowable voltage tripping threshold
  • Allowable phase imbalance threshold
  • Tripping time delay for load de-energizing in case of emergency voltage reduction
  • Tripping time delay for load de-energizing in case of other circuit faults
  • Time delay for load re-energizing after the circuit parameters recovery

The device can function a phase- or line- voltage monitor (user-selected). Three modifications of this device are currently produced.

Additional Information:

  • Item Code: RNPP-301
  • Port of Dispatch: New Delhi, India

Technical brief:

Rated phase/line voltage, V240/415
Mains frequency, Hz45-55
Harmonical configuration (nonsinusoidality) of power supply voltageEN 61000-3-2 (IEC 1000-3-2)
Adjustable range for Umin, % of nominal value5-25
Adjustable range for Umax, % of nominal value5-25
Adjustable range for phase imbalance/asymmetry, %5-20
Adjustable range for Tmin, sec0-20
Adjustable range for Toff, sec0-10
Adjustable range for Ton, sec0-600
Minimum trip delay when threshold settings are reached, sec0.1
Reset/energization delay when the relay energizes, sec, not more than0.2
Voltage hysteresis, V5-6
Accuracy of trip threshold for voltage, V, not more than3
Phase imbalance accuracy, %, not more than1.5
Safe operating voltage, % of rated value30-110
Power required (under load), VA, not more than3.0
Maximum switched current of output contacts, A5

Output contacts life:

  • under load 5A, no less than, operations
  • under load 1A, no less than, operations
1 mln.

Protection degree of:

  • apparatus
  • terminal block
Permissible contamination levelII
Overvoltage categoryIII
Nominal voltage of isolation, V450
Rated impulse withstand voltage, kV4
Cross-section area of connection terminals, mm²0.5-2
Maximum torque of terminal fixing, N*m0.4
Operating temperature range, °Cfrom -35 to +55
Weight, no more than, kg0.200
Case dimensions 4 modules of S-type
Mounting 35 mm DIN-rail
Mounting position as desired

RNPP-301 complies with requirements:

IEC 60947-1:2004, ІDТ; ІEC 60947-6-2:1992, ІDT; CISPR 11:2004, IDT; IEC 61000-4-2:2001, IDT