Voltage Monitoring Relay HRN-35

Single-phase system Voltage Monitoring Relay with the range AC 48 - 276 V with separate output relays for Umin and Umax.

Quick Facts

  • over- and undervoltage independently monitored
  • 2 switching contacts for over- and undervoltage
  • 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. The HRN-35 variant uses a separate relay for each level, which is switched off in the normal state. In case of exceeding the upper level (e.g. overvoltage) the first relay switches on, in case of falling below the lower level (e.g. undervoltage) the second relay switches on. However, it is still possible to clearly identify the fault state. In order to avoid short-term peaks, there is a delay that can be set in the range 0-10s. This comes into effect when the device changes from the normal state to the fault state and avoids unnecessary flickering of the output relays. When resetting to the normal state, the delay is no longer effective, but the hysteresis (2-6% depending on the set voltage) is. Through the change-over contacts, further configurations and functions result depending on the current requirements of the application.

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 85g

Ordering Data and Conformity

Type designation HRN-35
Article no. EL200152
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)
OFFONUnderrun Umin (undervoltage)

Pin Assignment

3-pole connector

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

2x 3-pole connector

15 Umax switching output 250V (common)
16 Umax switching output 250V (NC)
18 Umax switching output 250V (NO)
25 Umin switching output 250V (common)
26 Umin switching output 250V (NC)
28 Umin switching output 250V (NO)



Article no.: EL200152

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