Three-phase monitor with a pre-set asymmetry rate of 20%. It deactivates the Relay when the asymmetry between the phases exceeds 20%. Available for DIN rail mounting, it has a width of 2 modules (DIN rail 2M).

The PT531 is used to protect asynchronous three-phase motors from power distribution network faults that can lead to overheating or even destruction. It monitors the voltage of the three-phase network for asymmetry. In case of a fault, it reacts instantly and shuts down the motor.

• Voltage asymmetry (Pre-set 20%)