What is the purpose of an Automatic Transfer Switch?

An Automatic Transfer Switch (ATS) is designed specifically to transfer power between different sources. Its primary purpose is to ensure that an essential electrical load is supplied with power from either the primary source (typically the utility grid) or a backup source (such as a generator) without interruption. When it detects a power failure or a sudden drop in voltage from the main source, the ATS automatically switches to the backup power supply, allowing continuous operation of critical systems.

This capability is essential in applications where downtime can lead to significant issues, such as in hospitals, data centers, or emergency services. The seamless transition managed by the ATS minimizes the risk of equipment damage and operational disruption.

The other options, while related to power management in some sense, do not capture the primary function of an Automatic Transfer Switch. Dividing electrical loads pertains more to distribution systems, filtering electrical currents relates to the quality of the power supply, and controlling voltage levels deals with regulating power rather than transferring between sources. Thus, the correct understanding of the function of an ATS is that it primarily focuses on switching power sources efficiently to maintain electrical supply continuity.