Under-voltage monitoring relay LINETRAXX® VME421H series

over-voltagefrequency1 NO/NC

• Undervoltage, overvoltage and frequency monitoring of AC/DC systems 9.6…150 V (VME421H-D-1), 70…300 V (VME421H-D-2) • Integrated energy storage, is supplied by the system being monitored • Various monitoring functions selectable U, f • Password protection for device setting • Preset function (automatic setting of basic parameters) The voltage relays of the VME421H series are designed to monitor the frequency, undervoltage, overvoltage and the voltage between two threshold values (window discriminator function) in AC and DC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value leading to the activation of the alarm relays will be stored. Due to adjustable response times, installation-specific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. Device version VME421H takes the supply voltage from the system being monitored and utilizes an internal energy backup. • Undervoltage, overvoltage and frequency monitoring of AC/DC systems, 9.6…150 V (VME421H-D-1), 70…300 V (VME421H-D-2) • Without external supply voltage • Integrated energy backup • Different monitoring functions selectable U, f • Start-up delay, response delay, delay on release • Adjustable switching hysteresis • r.m.s. value measurement (AC + DC) • Digital measured value display via multi-functional LC display • Preset function (automatic assignment of basic parameters) • LEDs: Power On, Alarm 1, Alarm 2 • Measured value memory for operating value • Continuous self monitoring • Internal test/rest button