Digital voltage and frequency relay for single-phase AC and DC systems

The VME421H is a powerful, all-in-one unit for single-phase AC and DC systems for up to 300 V, monitoring over/undervoltage and over/underfrequency. Values are displayed and changed via a digital seven-segment display and menu. Values are displayed as true RMS values, and many different delays can be set.

The VME421H unit powers itself off of the line being monitored. For the version that utilizes an external supply voltage, please see the VME420.

Key Features
Technical Data
Ordering Information