After a power outage occurs, what will a UPS do once the input returns to normal?

When the input power returns to normal after a power outage, a UPS (Uninterruptible Power Supply) will typically switch from battery operation back to utility power, which involves charging its internal batteries. This means that the UPS will start to draw current from the reinstated electrical supply to replenish the power it used while providing backup during the outage.

Charging the battery is essential to ensure that the UPS is ready for any future power disruptions. The UPS will monitor the input supply for stability before completely transferring back and aligning its output with the restored utility power. This process helps maintain continuous protection for connected devices.

While other responses might represent potential actions the UPS could take during different circumstances, they don't accurately describe the standard procedure following a power restoration. For instance, immediately shutting down the output power would be counterproductive, as the UPS's purpose is to provide continuous power during interruptions. Continuing to operate on battery power would not be applicable, as the power outage has ended. Automatically rebooting connected systems might be a feature of some setups but isn't a fundamental function of UPS operation.