Monitoring voltage relay HRN-33Serves to control supply voltage for appliances sensitive to supply toleranceDESCRIPTION Serves to control supply voltage for appliances sensitive to supply tolerance. Supply from monitored voltage (monitors level of its own supply). U max and U min can be monitored independently. Adjustable time delay for all types is 0 - 10 s (to eliminate short voltage drops or peaks). Voltage Umin adjusted as % of Umax. 1-phase desing.