Feature:1. Working Principle: When the main power supply fails or the voltage is abnormal, the load is automatically transferred from the main to the backup power supply to ensure uninterrupted power supply. After the main power supply is resumed, ATS will automatically transfer the load back to the main power supply.2. Flexible Setting: This 3 phase automatic changeover switch allows you to freely prioritize mains power, generators, and inverters. The voltage threshold for switching can be set, so it will automatically switch when undervoltage or overvoltage occurs. The switching speed setting range is 1600s, with a default of 30s.3. Parameter Adjustment: Provides stable switching to prevent power fluctuations or interference. The conversion time, reset time, overvoltage or undervoltage guard, and overcurrent guard parameters can all be adjusted within the specified range.4. Flame Retardant PC: The automatic transfer switch housing is made of fireproof PC material, which is secure and flame retardant. Featuring high sensitivity, accurate measurement, and low heat generation, you can use it with confidence.5. Wide Application: This 3 phase 4 wire automatic transfer switch is widely applied in electric system that require continuous and stable power supply, including commercial and industrial buildings, medical facilities, data centers, base stations, etc.Specification:Item Type: Automatic Transfer SwitchMaterial: Flame Retardant PCPower Terminals: N, L1, L2, L3Automatic Reclosure Delay (Ton): 1-600sReturn Priority Phase Delay: 1-600sSwitching Delay to Reserve Phase: <0.2sVoltage Lag: 5VOvervoltage Trip Delay: 0.1s; 350V: 0.02sUndervoltage Trip Delay: 0.1s; 350V: 0.02sVoltage Accuracy: <1%Maximum Working Phase Voltage: 350VRated Working Current: 63AMaximum Working Current: 80APollution Grade: 3Altitude: 2000mAmbient Temperature: -25-50Relative Humidity: 50% at 40 (non condensing)Applicable Wire Size: 0.5mm-1mmInstallation: 35mm Standard Guide RailSize: Approx. 90 x 66 x 95mm / 3.5 x 2.6 x 3.7in.Package List:1 x Automatic Transfer Switch1 x User Manual