Dual Mode: The automatic transfer switch supports both automatic and manual operation modes for simple and reliable performance. In the event of a power supply failure—such as loss of voltage or phase (with monitoring on phase A and neutral)—it automatically transfers one or more load circuits from the failed source to the alternate source to ensure continuous power supply. Quick Switching: This automatic transfer switch features fast switching with load, ensuring safe transition under load conditions. The maximum switching time is less than 2 seconds, allowing connected appliances to continue operating without interruption in most cases. Protection Functions: The switch includes multiple protection features such as short circuit protection, overload protection, phase loss protection, and low voltage protection to enhance system safety and reliability. Easy Installation: Designed with a compact structure, the unit can be mounted vertically or horizontally using screws, enabling flexible and secure installation for reliable power connectivity. Excellent Material: Constructed with high-quality flame-retardant PC housing, brass components, PCB, and silver contacts, the switch offers excellent insulation, durability under extreme temperatures, resistance to aging, and improved conductivity and lifespan. Broad Applications: Suitable for various applications, this automatic changeover switch is ideal for residential use and critical environments where uninterrupted power is essential, including hospitals, banks, and industrial facilities. Package Includes: 1 x Dual Power Automatic Transfer Switch Product Name: Dual Power Automatic Transfer Switch Material: Flame-retardant PC, brass, PCB, silver Current Rating: 100A Working Frequency: 50Hz Rated Voltage: AC 230V Operating Voltage: AC 220V Display: Indicator lights Operation Mode: Automatic and manual ATS Level: CB level Transfer Time: 2 seconds Utilization Category: AC-33iB Switching Mode: Automatic transfer and automatic retransfer Compliance Standards: IEC 947-6-1, GB 14048.11 Working Principle: This dual power supply controller monitors the phase A and neutral line from both the main and standby power sources. In automatic mode, when the main source phase A and neutral voltages are within the normal range (AC 190–240V), the controller prioritizes connection to the main supply, closing the main circuit regardless of the status of phases B and C or the standby source. The power indicator and main supply indicator will illuminate. If the main source loses voltage on phase A and neutral while the standby source has normal voltage on phase A and neutral, the system automatically switches to the standby supply, closing the standby circuit and illuminating the corresponding indicators. Manual Operation: The switch can be operated manually regardless of input voltage conditions. To use manual mode, set the auto/manual selector to manual. Rotate the handle clockwise to connect the main power (N) and disconnect the standby (R). Rotate counterclockwise to connect the standby power (R) and disconnect the main (N).