The VME420 series of products is comprised of voltage relays that are designed to monitor the undervoltage, overvoltage and voltage between two threshold values. This item works with both DC and AC systems, while all voltages are measured as r.m.s. values. In addition, the measured values are shown on an LCD display.
The measured values leading to the activation of the alarm will always be stored, while the adjustable response times makes it possible to consider device-specific start-up procedures and short-time voltage fluctuations. Finally, the item also requires an external supply voltage, so make sure to take this into account.