Power Electronics Sequential Unbalance Monitor Neutral 3Ph With 8Pin PT431-8

It is used to protect asynchronous three-phase motors from irregularities in the electrical distribution network.

It monitors the voltage of the three-phase network for the loss of one or more phases or the neutral, the asymmetry of the three phases (adjustable 5-20%), their succession, overvoltage and undervoltage.

The supervisor relay is activated when all three phases of the network do not deviate from each other by more than the adjustable value, do not exceed 270VAC (phase voltage) and their sequence is correct.

In any other case, as well as in case of total loss of a phase (below 130VAC phase voltage), the relay is deactivated. It is digital and operates with a microcontroller.