Monitoring voltage relay, 3 phases - monitors overvoltage / undervoltage, phase failure

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44.20 €
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53.48 €
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HRN-57N | Relay for monitoring over/under voltage in 3-phase mains


  • It serves to monitor voltage in a switchboard, protection of devices in 3-phase main.
  • It monitors the value of voltage in 3-phase main.
  • It is possible to set upper and lower level independently.
  • Adjustable time delay eliminated short voltage peaks and failures in the main.
  • The device is supplied from monitored voltage.
  • Faulty state is indicated by a red LED and by breaking output relay contact.
  • Output contact 1x changeover / SPDT 8 A / 250 V AC1.
  • Relay doesn’t monitor the phase sequence.
  • HRN-57: supply from all phases, means that relay is functional also in case of failure in one phase.
  • HRN-57N: supply L1, L2, L3-N, means that relay monitors also a failure of the neutral wire.
  • 1-MODULE, DIN rail mounting.


Technical parameters


  • Monitoring terminals: L1, L2, L3, N
  • Voltage: 3x 400 V / 230 V / 50-60 Hz
  • Burden: max. 2 VA
  • Number of contacts: 1x changeover / SPDT (AgNi / Silver Alloy)
  • Output indication: red LED
  • Operating temperature: -20 °C to 55 °C
  • Operating position: any
  • Mounting: DIN rail EN 60715
  • Protection degree: IP40 from front panel / IP10 terminals
  • Dimensions: 90 x 17.6 x 64 mm
  • Weight: 66 g
Documents in current location:
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ELKO EP, s.r.o., Holešov

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