The 84873026 is a three-phase monitoring relay designed to control and protect 3-phase networks through phase sequence and phase failure detection, asymmetry monitoring, and under/overvoltage detection with independent settings. It features true RMS measurement with a measuring range of 194 to 528 V~, operates on a rated control supply voltage of 3 × 220 to 3 × 480 V AC, and provides one 8 A changeover output contact with a maximum switching power of 2000 VA. The relay includes LED status indication for power, relay status, and fault conditions, with a power-on delay of =650 ms and a maximum measuring cycle time of 140 ms. This device is ideal for industrial applications requiring reliable protection of three-phase electrical systems, offering precise voltage monitoring, automatic fault detection, and independent threshold adjustment capabilities to prevent equipment damage and ensure system continuity.