Features: Fully automatic overvoltage and undervoltage protector suitable for single phase AC voltage 230V, 50/60Hz, rated working current 63A and below. Used for monitoring over-voltage, under-voltage or over-current conditions in residential household box distribution lines or single-phase power equipment. Disconnects power supply during overvoltage, undervoltage, or overcurrent conditions. Device reconnects automatically when line voltage returns to normal. Specifications: Item Type: over/undervoltage protector Material: Plastic Over voltage: 230~300V (adjustable) Undervoltage: 210~145V (adjustable) Size: approx.36x85mm/1.42x3.35in, 65x45mm/2.56x1.77in Color: White Quantity: 1 Pc Note: No retail package. Conversion: 1cm=10mm=0.39inch. Please allow 0-1cm error due to manual measurement. Due to differences in monitor settings, image colors may not reflect the actual color of the item. Package Includes: 1 x Over/Undervoltage Protector (accessories shown in pictures are not included.)