3-phase voltage monitor relay

24 March 2004 Circuit & System Protection

Citels' VM230/TRI is designed to continuously control a 3-phase 230/400 V network in order to detect any kind of AC failures that may disturb or destroy sensitive equipment. Some of these are overvoltages, undervoltages, a missing phase, phase inversion or frequency shifts.

In case of failure detection, the VM230/TRI will activate an output dry contact in order to drive an external line contactor and to disconnect the internal network from the external electrical grid. After the fault has cleared, it will reset automatically and reconnect the AC line through the contactor. The VM230/TRI is equipped in front side with LCD display for: permanent display of the AC voltage of each phase, information of the type of failure detected, tuning the thresholds (voltage detection and reset time).

The product is a modular type to fit on standard symmetrical DIN rails. To provide maximum safety, especially in case of lightning surge voltages, it is recommended that an AC Surge Protector (CITEL DS44 type) is installed upstream of the VM230/TRI.

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