84873029 is a phase control monitoring relay (MWS type) designed for phase sequence and phase failure detection on 3-phase networks. It features a wide measurement range of 183 to 528 V~ with true RMS measurement capability and a power supply range of 208 to 480 V~. The relay provides one 8 A changeover output with a maximum switching power of 2000 VA (resistive) and supports operating temperatures from -20°C to +50°C. With LED status indication, dielectric strength of 2 kV, and compliance with multiple IEC/EN standards, this relay is suitable for industrial applications requiring reliable phase monitoring and protection in electrical distribution systems.