The DPB52CM44 is a multifunction 3-phase mains monitoring relay designed to protect 3-wire (3P) systems by monitoring phase loss, phase sequence, overvoltage, and undervoltage conditions. It operates on power supplies ranging from 208 to 480 VAC at 50–60 Hz, with adjustable overvoltage and undervoltage setpoints from 2 to 22% and a configurable alarm delay of 0.1 to 30 seconds. The relay features a single SPDT changeover output rated at 5 A @ 250 VAC (AC15: 2.5 A @ 250 VAC) with an electrical lifetime of =50,000 operations, along with status LEDs for quick troubleshooting. Housed in a compact 17.5 mm DIN-rail module with operating temperatures from -20 to 60°C, the DPB52CM44 is ideal for industrial plants, power substations, and control systems requiring reliable mains quality monitoring and protection against voltage anomalies.