Voltage monitoring relays in 3 Phase


Voltage monitoring relays in 3P with adjustable levels HRN-57N, 3 x 172-287 V with NEUTRAL

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Product detail


  • It serves to monitor voltage, phase failure and sequence in switchboards, protection of devices in 3-phase mains.
  • It is possible to set upper and lower level of monitoring voltage.
  • Adjustable time delay eliminates short voltage peaks and failures in the main.
  • Supplied from monitored voltage.
  • Faulty state is indicated by red LED and by opening of output relay contact.
  • Output contact 1 or 2 x changeover / SPDT 8 A / 250 V AC1.
  • In case supply voltage falls below 60 %Un (UOFF lower level) relay immediately opens without delay.
  • HRN-54: supply from all phases which means that relay is functional also in case when one phase is faulty.
  • HRN-57N, 54N, 43N,: supply L1, L2, L3-N, means that relay monitors also failure of neutral wire.
  • 1 or 3 MODULE, DIN rail mounting.


  • Phase failure: Yes
  • Phase sequence: Yes / x
  • Overvoltage: Yes
  • Undervoltage: Yes
  • Asymmetry: Yes / x
  • Monitored range:  AC 3 x 172-287 V 
  • Supply voltage: 1 or 2 x CO, 8 A
  • Housing: 1 or 3 -MODULE
  • Power supply: from monitored voltage or External
MIT Maximize Integrated Technology Co.,Ltd.

MIT Maximize Integrated Technology Co.,Ltd. is a global leader in power quality, industrial automation and power control product and service solutions. Products include circuit breakers, switchgear, UPS and DC power systems, power distribution units, motor controls, meters, sensors, relays and inverters. The principal markets for the Electrical Sector are industrial, institutional, government, utility, commercial, residential, information technology, telecommunications and original equipment manufacturer customers.