The dual-power automatic transfer switch (ATS) is a core device that realizes the automatic switching of two power sources (main power + backup power) in the power system. When the main power supply fails (such as power outage, overvoltage, undervoltage, or phase loss), it can automatically switch the load circuit to the backup power supply within milliseconds to seconds, avoiding power outages that cause equipment downtime, production interruption, or service paralysis in critical scenarios (such as hospitals and data centers). It is widely used in places with extremely high requirements for power supply reliability.