Voltage Monitoring HRN-41/HRN-42

Single-phase system monitoring: DC and AC, in 3 ranges / HRN-41 "hysteresis" function / HRN-42 "window" function

Quick Facts

  • monitoring of DC and AC voltage in single-phase systems in 3 ranges
  • voltage monitoring: in 2 independent levels (overvoltage/undervoltage)
  • 2 versions, HRN-41: "HYSTERESIS" function and HRN-42: "WINDOW" function
  • "MEMORY" function - for resetting from fault state to normal state - press "RESET
  • function of the 2nd relay (independent/parallel)
  • adjustable delay to avoid voltage peaks
  • galvanic isolated supply

The relay is delivered in 2 variants - depending on how the voltage levels are set and monitored.

HRN-41 has a "hysteresis" function, i.e. only the upper level (Umax) is set and the lower level (Umin) is set in % of the upper level. Therefore, the lower level changes automatically as soon as the upper level changes.

HRN-42 has a "window" function, i.e. the upper level (Umax) and the lower level (Umin) are set individually in % of the monitored voltage. Both types have a "MEMORY" function. If the relay enters the fault state, the setting is stored until the reset button is pressed. DIP switch no. 3 is used to set whether the relays should switch independently for each level or in parallel if the voltage level is exceeded or not reached. DIP switch no. 4 is used for hysteresis setting, which takes effect when resetting from fault state to normal state. The relay is protected against reverse polarity of the DC voltage or wrong AC/DC input voltage. This is indicated by simultaneous blinking of both LEDs (LED <U and LED >U).

Electrical Data

Operating voltage AC 110 V, AC 230 V, AC 400 V or AC/DC 24 V (AC 50-60Hz)
Power consumption max. 4.5 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 3 HP
Dimensions WxHxD 90x52x65mm
Weight 239g

Ordering Data and Conformity

Type designation HRN-41 / HRN-42
Article no. EL200153 / EL200155
Make Elko
Conformity CE


Umax [%U] Upper limit setting - Umax
t1 [s]t1 - delay Umax
Umin [%Umax]Lower limit setting - Umin
t2 [s]t2 - delay Umin

DIP Switches

DIP StateSetting
DIP-1ACMeasured voltage AC
DCMeasured voltage DC
DIP-2OFFMemory function inactive
ONMemory function active
DIP-312nd relay parallel
22nd relay independent
DIP-45%Hysteresis setting 5%
10%Hysteresis setting 10%

Function Indicators (LEDs on the Module)

UnSupply display
>UDisplay Umax
RelayOutput display
<UDisplay Umin

Pin Assignment

6-pole connector

A1 Supply
A2 Supply
C Potential
B1 10-50 V (AC 50Hz)
B2 32-160 V (AC 50Hz)
B3 100-500 V (AC 50Hz)

6-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.: EL200153

Single-phase system monitoring: DC and AC, in 3 ranges

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