. Fine workmanship and perfect style. Technical Parameters: Rated power supply voltage: AC220V Working voltage range: AC80~400V (single phase) Working frequency: 50/60Hz Overcurrent setting range: 1~63A Overvoltage setting range: 230~300V Undervoltage setting range: 80~210V Error margin: 2% Protection action delay: 0.5s Reset/start delay: 1s~600s Measurement accuracy: 1% (not to exceed 1% of total range) Insulation voltage: 400V Output contact: 1NO Contact electrical life: 10 Contact mechanical life: 10 Protection level: IP20 Pollution level: 3 Altitude: 2000m Operating temperature: -50C~55C Humidity: 50%at40C Working temperature: -30C~70C Tips: The product may be updated constantly, Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Material: plastic colour: White Package Contents: 1 x Under Voltage Protective Device Only the above package content, other products are not included. Note: Light reflection 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.