An automatic transfer switch (ATS) is a device that automatically transfers a power supply from its primary source to a backup source upon detecting a failure or outage in the primary source. In the event of a primary power system failure, the ATS will activate a standby power source, such as an uninterruptible power supply. The ATS can also initiate more long-term backup power systems, like local diesel generators, to power electrical equipment until utility power is reinstated.
As the ATS connects to both the primary and backup power sources, it acts as an intermediary between equipment and power supplies, serving as an electrical relay. Additionally, it can function as a redundant, rack-mounted power supply for equipment with a single corded power source.
In a data centre, ensuring uninterrupted power is of great importance. To maintain uninterrupted service, the power path systems must receive proper maintenance and testing. To guarantee dependability during a power failure, data centre administrators must regularly oversee the ATS. ATS units can manage significant quantities of energy, pushing the electrical contacts beyond their limit, thus making usual upkeep essential.
Manual power transfer switches are also present, necessitating a data centre manager to manually switch to an alternative power source instead of switching automatically.
