Monitoring voltage relay
HRN-57N

Serves to monitor voltage in a switchboard, protection of devices in 3-phase main

DESCRIPTION

  • Relay doesn’t monitor phase sequence.
  • Supply is done from monitored voltage.
  • Fixed T1(500ms) and adjustable T2 (0.1 – 10 s) delay to eliminate short voltage drops and peak.
  • In case supply voltage falls below 60 %Un (U off lower level) relay immediately switch OFF with no delay.
  • It is possible to set upper and lower level independently.
  • Monitoring voltage relay in two variants:

HRN-57: supply from all phases, means that relay is functional also in case of failure in one phase
HRN-57N: supply L1-N, means that relay monitors also failure of neutral wire, replacement for HRN-52

  • Faulty state is indicated by red LED and by breaking output relay contact.

TECHNICAL PARAMETERS

  • Monitored power voltage: 

HRN-57: 3 x 400 V 
HRN-57N: 3 x 400 V/ 230 V

  • Umax: 105 – 125% of monitored voltage.
  • Umin: 75 – 95% of monitored voltage.
  • Output contact: 1x changeover 8 A/250 V AC1 (AgNi, 2500 VA)
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Accessories for the set Monitoring voltage relay
HRN-57N

Single-function time relay CRM-81J photo

Single-function time relay CRM-81J

3 functions and 6 time ranges, multivoltage or 230V supply, output 16A changeover/SPDT Product detail

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