Mainly used for the protection of over-voltage, under-voltage or over-current in the incoming line of residential household box or the distribution line which needs to protect single-phase electrical equipment. Its main feature is that the line appears overvoltage or undervoltage, overcurrent status, the product can instantly cut off the power supply, protect the electrical equipment from damage; when the line voltage returns to normal, the protector can automatically and normally turn on the power supply. Functions: 1. Overvoltage protection 2. Undervoltage protection 3. Voltage display (voltage measurement) 4. Overvoltage protection value adjustable 5. Overvoltage recovery value adjustable 6. Overvoltage protection operation time adjustable 7. Undervoltage protection value adjustable 8. Undervoltage recovery value adjustable 9. Undervoltage protection operation time adjustable 10. Fault recovery delay time adjustable 11. Up-power adjustable,Delay time 12. Reset mode selection 13. Fault query 14. Restore factory settings Specifications: Parameters: Voltage 110V, 50/60Hz Current:40A Colour: white Material: ABS + electronic component Size: 9.0 cm x 4.0 cm x 5.0 cm Package Contents: 1 * Current limiting protector 1 * User Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.