Under-voltage monitoring relay LINETRAXX® VMD420 series
over-voltagefrequencyphase sequence

under-voltage monitoring relay
under-voltage monitoring relay
under-voltage monitoring relay
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Measured/monitored value
under-voltage, over-voltage, frequency, phase sequence, phase loss, phase unbalance
Contact configuration
1 NO, 1 NC
AC, three-phase
Other characteristics
adjustable, multifunction, digital


The multi-functional VMD420 series voltage is used for observing frequency, under and over voltage. It also monitors the voltage between two limit values in 3 AC systems. This product has a digital screen where the currently measured value will be shown. The voltages are measured as R.M.S. values. The measured value is needed to trigger the alarm relay is stored. The installation-specific characteristics could be considered because of its flexible reaction times.


*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.