What is a true statement about static transfer switches?

Static transfer switches are designed to provide a fast transfer of power between different sources, typically from a primary power source to a backup power source, ensuring that critical loads receive continuous power. The statement that they operate in less than 1 millisecond from normal to alternate source highlights their rapid response capability, which is a fundamental characteristic of static transfer switches. This rapid switching is essential for applications where even a brief interruption in power can lead to significant issues, such as data loss or equipment damage.

The ability to switch sources in such a short time frame makes them particularly valuable in mission-critical environments, like data centers and healthcare facilities, where maintaining power continuity is vital. This quick operation is achieved through solid-state technology, which eliminates the mechanical delays associated with traditional electromechanical switches. The focus on speed and reliability underscores why static transfer switches are often employed for sensitive equipment that requires an uninterruptible power supply.