AUTOMATIC TRANSFER: When the main power supply fail or the voltage is abnormal, the ATS automatically transfer the load from the main power supply to the standby power supply to ensure uninterrupted power supply. Priority is L1>L2>L3. ATS ensure smooth switching between the primary and backup power supplies, preventing power fluctuations or interference. After the main power supply recovers, the ATS automatically transfer the load back to the main power supply to ensure a seamless system restart