Features:1. The automatic recovery overvoltage and undervoltage protection devices comply with modular design standards.2. When the power supply is unstable, the protection function will be automatically activated. Once the voltage exceeds the limited range of the product, it will automatically cut off to protect the safety of electrical equipment and personnel.3. When the power supply returns to normal, the devices will power up again within 30 seconds.4. When the power supply is normal, the green indicator light shows. When the power supply is overvoltage or undervoltage, the red indicator shows.5. Functions: Over-voltage protection; Under-voltage protection; Over current protection; Automatic recovery; Volt-meter; Amp-meter.