Yueqing Huilong’s phase protection relay safeguards three - phase electrical systems against faults like phase loss, phase reversal, and voltage imbalance. This relay features microprocessor - based detection, monitoring voltage and current parameters in real time with ±1% accuracy. It offers adjustable trip settings for phase sequence (1 - 5 seconds), voltage unbalance (5 - 15%), and under/over voltage (50 - 130% of rated voltage). The relay provides both audible alarm (buzzer) and visual indication (LEDs) for fault types, while the RS485 interface enables remote monitoring. With a compact design (DIN rail mount, 48mm width), it fits easily in control panels. Suitable for motors, pumps, and compressors, the phase protection relay meets IEC 60255 standards, preventing equipment damage and downtime in industrial plants.