Feature: 1. Automatic Switching Function: This DIN rail mounted voltage monitor has an automatic switching function, when the main power supply fails or the voltage is abnormal, the ATS will automatically transfer the load from the main power supply to the backup power supply to ensure uninterrupted power supply. 2. Multifunctional: This 3 phase voltage monitor ensures stable switching between the main and standby power supply, preventing power fluctuations or interference. And with an automatic restart function, it will automatically transfer the load back to the main power supply when the main power supply is restored, ensuring a seamless restart of the system. The switching time, reset time, overvoltage and undervoltage guard, and overcurrent guard parameters can all be adjusted within the specified range. 3. Flexible Settings: This automatic transfer switch gives you the freedom to prioritize mains, generator and inverter. You can set the voltage threshold for switching, so it will automatically switch when there is an undervoltage or overvoltage. The switching speed can also be set in a range from 1s to 600s, with a default of 30s. 4. Sturdy And Robust: This 3 phase voltage protector is made of excellent PC material, which is sturdy and robust and not easy to burn, ensuring the safety of use. It is characterized by sensitive operation, accurate measurement and minimal heat generation. 5. Wide Application: This under over voltage protector has a wide range of applications and can be used in power systems in areas that require a constant and stable supply of power, including commercial and industrial buildings, medical facilities, data centers, communication base stations, and more. Specification: Item Type: Automatic Transfer Switch Material: Flame Retardant PC Power Terminals: N, L1, L2, L3 Automatic Reclosing Delay (Ton): 1-600s Return Priority Stage Delay: 1-600s Switch Delay to Reserve Phase: <0.2s Overvoltage Trip Delay: 0.1s, ≥350V: 0.02s Undervoltage Trip Delay: 0.1s, ≥350V: 0.02s Rated Working Current: 63A Maximum Working Current: 80A Pollution Level: 3 Altitude: ≤2000m Ambient Temperature: -25℃-+50℃ Relative Humidity: ≤50% at 40℃ (Non Condensing) Wire Size: 0.5mm²-1mm² Installation: 35mm Standard Guide Rail. Package List: 1 x Automatic Transfer Switch 1 x Manual