• serves to control supply voltage for appliances sensitive to supply tolerance, protection of the device against under/over voltage
  

• HRN-3x is band voltage relay, HRN-6x is over/under voltage relay. For difference - pes see grach of function
  

• HRN-33, HRN-63
  

- monitors voltage in range AC 48 - 276 V
- U max and U min can be monitored independently

• HRN-34, HRN-64
  

- like HRN-33, but voltage range is DC 6 - 30 V
- monitoring of battery circuits (12, 24 V)

• HRN-35
  

- like HRN-33, but independent output relays for each voltage level
- switching of other loads possible

• HRN-37, HRN-67
  

- like HRN-33, monitors voltage in range AC 24 -150 V
- it is possible to monitor level of overvoltage and undervoltage independently

• adjustable time delay for all types is 0 - 10 s (to eliminate short voltage drops or peaks)
  

• voltage Umin adjusted as % of Umax
  

• 3-state indication - LEDs indicating normal state and 2 fault states
  

• supply from monitored voltage (monitors level of its own supply)
  

• 1-MODULE, DIN rail mounting