Voltage relay for three-phase AC systems


The VMD258 series voltage relay monitors for undervoltage and overvoltage in threephase AC systems. Both overvoltage and undervoltage are monitored for simultaneously. Alarm values are set as a percentage of the system voltage (see ordering information for more). Power for the monitoring is derived from the monitored system; an external supply voltage is not required. Many different system voltage ratings are available, up to 690 VAC. 2 DPDT contact outputs are available.

The device contains analog-only components and is not microprocessor controlled. The supply of the electronics and relays are isolated by means of double isolation. Special input transformers attenuate system interferences.

Key Features
Technical Data
Ordering Information