Voltage Monitoring Relay HRN-33

Single-phase system Voltage Monitoring Relay with the range AC 48 - 276 V

Quick Facts

  • over- and undervoltage independently monitored
  • AC 48 - 276V
  • Umax adjustable in V
  • Umin adjustable in % of Umax
  • delay: 0 - 10 sec. adjustable

The HRN-3 Monitoring Relay is used to monitor the voltage level in single-phase systems. The monitored voltage is also the supply voltage. With the relay it is possible to set 2 independent levels. With the HRN-33, the relay is permanently switched on in the normal state. If the set value is exceeded or not reached, the relay is switched off. This combination of the output relay circuit is advantageous if there is a total failure of the supply voltage, or a voltage drop within the set level. In both cases the output relay is always switched off.

Electrical Data

Operating voltage AC 48 - 276 V / 50Hz
Power consumption AC max. 1.2 VA
Switching output 250 V AC1 / 24 V DC
Mechanical life 3 x 10^7
Connection screw terminals 2.5mm²
Max. ambient temperature -20°C to +55°C
Storage temperature -30°C to +70°C
Protection class IP40
Voltage limitation class III
Pollution degree 2

Design, Dimensions, Weight

Design DIN rail plastic housing light grey, snap-on on 35mm DIN rail 1 HP
Dimensions WxHxD 17.6x90x64mm
Weight 61g

Ordering Data and Conformity

Type designation HRN-33
Article no. EL200150
Make Elko
Conformity CE


Umax [V] Upper limit setting Umax
t [s]Setting the delay
Umin [%Umax]Lower limit setting Umin

Function Indicators (LEDs on the Module)

ONOFFNormal state
ONONExceeding Umax (overvoltage), underrun Umin (undervoltage)

Pin Assignment

3-pole connector

A1 Supply AC 48 - 276 V
A2 Supply AC 48 - 276 V

3-pole connector

15 Switching output 250V (common)
16 Switching output 250V (NC)
18 Switching output 250V (NO)




Article no.: EL200150

Single-phase system voltage monitoring relay with the range AC 48-276V

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