Features ★ 2 CONTROL MODES AUTOMATIC GENERATOR TRANSFER SWITCH: The automatic transfer switch not only supports automatic mode, but also can be operated through manual buttons, simple to operate. ★ MAIN FUNCTION: When one power supply fails, the switch will automatically connect to the other power supply to ensure normal power supply to the load circuit. ★ MULTIPLE PROTECTION: This changeover switch supports multiple protection functions, including short circuit, overload, phase loss, and undervoltage protection, very safe and reliable to use. ★ HIGH PERFORMANCE: The transfer switch has large load power, fast switching speed, maximum switching speed is less than 2S.This ATS has compact structure, adopts screw installation, can be installed vertically or horizontally. ★ Customer Service - We are committed to meeting customer demands to create the finest products. Any suggestions and request please feel free to contact us in anytime that we can try our utmost to reply in short time. Specification: Item Type: Dual Power Automatic Transfer Switch Material: PC Flame Retardant, Brass, PCB, Silver Model: GFQ3 125 4P Current: 125A Operating Frequency: 50Hz Rated Voltage: AC400V Working Voltage: AC380V Display Function: Indicator light display Operation Mode: Automatic, manual ATS Level: CB level Conversion Time: ≤2s Usage Level: AC 33iB Conversion Method: Automatic switching and automatic recovery Mechanical Life: Automatic: 3000 times, Manual: 1500 times Compliance Standard: IEC947-6-1GB14048.11Package List:1 x Dual Power Automatic Transfer Switch1 x User ManualNote:1. The maximum ambient temperature shall not exceed 40℃, the minimum temperature shall not be lower than ‑5℃, and the average temperature within 24 hours shall not be higher than 35℃. 2. The altitude of the installation site should not be higher than 2000m. 3. When the maximum temperature reaches 40℃, the relative humidity of the installation site should not exceed 50%. When the temperature is the lowest temperature ‑5℃, the relative humidity is higher, for example, when the temperature is 25℃, the relative humidity is 90%. Due to temperature changes, special measures should be taken to deal with occasional condensation on the surface of the product. 4. Low pollution level, no serious vibration and impact, no corrosive environment, no serious dust, no conductive particles, explosive hazardous substances, and no strong electromagnetic interference. Package List 1 x Dual Power Automatic Transfer Switch 1 x User Manual