DPC02DM44 is a multifunction 3-phase mains monitoring relay designed for DIN-rail mounting that monitors phase loss, phase sequence, overvoltage, undervoltage, and frequency variations in 3-phase power systems. The device operates on both 3-wire (3P) and 4-wire (3P+N) systems with a wide voltage range of 208 to 690 VAC (±15%, 177 to 793 VAC) and frequency range of 50 to 60 Hz ± 10% sinusoidal waveform. It features two independent SPDT electromechanical relay outputs with changeover contacts, adjustable voltage and frequency setpoints via front dials, and two independent delay functions up to 30 seconds for over/under voltage and frequency alarms. The relay provides ultra-high harmonic immunity for noisy environments, output and status LED indication for troubleshooting, and adjustable power-on delay to prevent nuisance tripping. With an operating temperature range of -20 to 60°C, IP20 protection degree, and compact DIN-rail form factor (45 × 80 × 99.5 mm), it is ideal for industrial plants, power distribution systems, and critical infrastructure requiring reliable mains monitoring and protection.