YOSHINE Single-Phase Automatic Reset Voltage Protection Relay

The YX742S1R4 Single-Phase Automatic Reset Voltage Protection Relay is designed for low-voltage single-phase power systems operating within 100–127VAC/DC. It provides stable and responsive protection against abnormal voltage fluctuations, helping safeguard electrical equipment in residential, light commercial, and small industrial environments.

This model monitors both under-voltage and over-voltage conditions within a 70–150VAC/DC detection range. When the supply voltage exceeds preset safety thresholds or drops below the required operating level, the relay disconnects the load automatically to reduce potential risks to connected devices. Once the voltage returns to the acceptable working range, the relay restores power automatically without manual intervention, ensuring convenience and minimizing downtime.

The YX742S1R4 is particularly suitable for applications where 110V or 120V power systems are commonly used, such as household appliances, office equipment, small control panels, lighting circuits, and compact machinery. By continuously tracking voltage conditions, it helps reduce the likelihood of equipment malfunction caused by unstable supply, including damage to motors, compressors, circuit boards, and other sensitive components.

Its compact structure allows easy installation in distribution boxes or control cabinets. The relay is engineered for consistent operation and integrates smoothly into standard single-phase systems. Clear parameter settings make it practical for technicians to configure according to different load requirements.

This model focuses on maintaining steady voltage protection in regions where lower single-phase voltage standards are applied. It offers a balanced combination of safety response and automatic recovery, supporting stable system performance in daily power usage scenarios.