A transfer switch is used to shift power from the normal utility source to what?

A transfer switch is an essential component in electrical systems that allows for the safe and efficient switching of power sources. When the normal utility power supply is interrupted or fails, the transfer switch enables the building's electrical system to switch to an alternative power source, which is typically a generator.

Using a generator as an alternative power supply allows essential services and equipment to continue operating during power outages, ensuring functionality and safety. The transfer switch isolates the utility grid from the generator, preventing backfeeding, which can be dangerous for utility workers and damaging to equipment.

While an inverter, battery backup, and transformer serve important roles in an electrical system, they do not represent the primary purpose of a transfer switch. An inverter converts DC power to AC power, a battery backup provides temporary power storage, and a transformer changes voltage levels but does not serve as an alternative power source itself. Hence, the correct function of a transfer switch centers around shifting power to a generator.