This monitoring relay, part number 2866064 from PHOENIX CONTACT, is designed for the reliable monitoring of 3-phase voltages ranging from 280 to 520 V AC. This compact device is equipped with a variety of monitoring functions including undervoltage, window, phase sequence, phase failure, and asymmetry detection. The wide-range power supply unit ensures compatibility with different voltage sources, while the 2 PDTs enable versatile switching capabilities. Trust in this advanced monitoring relay for the protection and control of 3-phase electrical systems.