Features 2 CONTROL MODES: The 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. HIGH PERFORMANCE: The transfer switch has large load power, fast switching speed, maximum switching speed is less than 2S. MULTIPLE PROTECTION: This changeover supports multiple protection functions, including short circuit, overload, phase loss, and undervoltage protection, very safe and reliable to use. EASY INSTALLATION: This ATS has compact structure, adopts screw installation, can be installed vertically or horizontally. 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: IEC947-6-1GB14048.11 Package List: 1 x Dual Power Automatic Transfer Switch 1 x User Manual Package List 1 x Dual Power Automatic Transfer Switch 1 x User Manual