YUANKY HWV4-63AS is an intelligent microcontroller-based voltage and current monitoring protection relay designed for comprehensive power quality supervision and fault protection in low-voltage AC distribution systems. Equipped with a digital display that shows real-time operating voltage and current values, it delivers accurate, intuitive status monitoring and multi-dimensional protection for downstream electrical equipment. Rated for AC220V supply voltage and compatible with 50/60Hz frequency, it operates reliably across a wide voltage range from 140V to 300V AC. Featuring a compact 5-module design with standard DIN rail mounting, it fits seamlessly into distribution cabinets and control panels without occupying excessive space.

This protection relay integrates multiple protection functions to safeguard equipment from various power abnormalities. It provides over-voltage and under-voltage protection, over-current protection, three-phase asymmetry protection and incorrect phase sequence protection, effectively preventing equipment damage caused by grid fluctuations, wiring errors and phase imbalance faults. With a voltage measurement accuracy of ≤1% across the full operating range, it ensures highly precise monitoring and reliable triggering. Adjustable hysteresis settings — 5V for over-voltage and asymmetry, 3V for under-voltage — avoid frequent nuisance tripping, while a 10-second asymmetry trip delay filters out transient disturbances. All protection parameters can be easily configured via front-panel keys, and dedicated LED indicators clearly display over-voltage, under-voltage and over-current fault states for quick troubleshooting. It is fitted with 1 normally open output contact, with both electrical and mechanical lifespans reaching 100,000 operations for long-term stable performance.

The HWV4-63AS serves a wide range of industrial and commercial application scenarios. In manufacturing facilities, it is installed on the power supply side of three-phase motors, water pumps, air compressors and production line equipment to prevent winding burnout and mechanical failure caused by abnormal voltage or wrong phase sequence. In building electrical systems, it protects elevators, central air conditioning units, lifting equipment and other motor-driven facilities that are highly sensitive to phase sequence and voltage stability. It is also widely deployed in distribution cabinets of data centers, telecommunication base stations and automated control systems to monitor incoming power quality and trigger alarm or shutdown signals in case of anomalies. Additionally, it is suitable for commercial facilities, municipal engineering and renewable energy systems where stable three-phase power supply is critical.

With integrated monitoring and protection, user-friendly parameter setting and reliable DIN rail installation, YUANKY HWV4-63AS provides a cost-effective and highly practical power quality protection solution for global electrical contractors, equipment manufacturers and facility operators.