1、With power supply voltage/current measurement protection (true RMS voltage measurement) and voltage/current value digital display. 2、The over/under voltage value and over current value can be set, and it has a dual bus bar design for strong wiring capabilities. 3、Self-starting can be realized, and self-reset time can be set at the same time, small in size but has good performance. 4、With long service life, electrical life is 100,000 and mechanical life is 1,000,000. 5、The rated power supply voltage is AC220V, and the rated power supply frequency is 45~65Hz. 1 x Surge Protection Device1 x User Manual  Item Type: Surge Protection DeviceRated Power Supply Voltage: AC220VRated Power Frequency: 45~65HzRated Current: 63AVoltage Display: YesCurrent Display: NoOvervoltage Action Value Setting Range: 230V~ 300V (factory default 275V)Setting Range of Undervoltage Action Value: 145V~ 210V (factory default 175V)Over/under Voltage Action Delay Time: 0.5sOvercurrent Action Value Setting Range: NoOvercurrent Action Delay Time: NoHysteresis Rate: 5% (set value of voltage\current)Power-On Delay Time: 2sReset Delay Time: 2~900s (factory default 30s)Measurement Error: ≤2%Delay Error: ±10%IP Rating: IP20Pollution Degree: 3Electrical Life: 100000Mechanical Life: 1000000Altitude: ≤2000mWorking Environment Temperature: -20℃~ 55℃Allowable Relative Humidity: ≤50% (40℃) (no condensation)Rail Standard: Width: Approx. 35mm / 1.4in (IEC/EN60715)