What is the automatic transfer time for Mechanical ATS primary-to-catcher?

The correct answer reflects the typical operation of a mechanical automatic transfer switch (ATS), particularly the specifications of the ATC300 series. When an electrical failure occurs that requires a transfer to an emergency generator, a well-designed mechanical ATS will initiate this process within a specific time frame to ensure minimal disruption in power supply.

In this case, the ATC300 model facilitates a transfer to emergency power in 48 seconds. This relatively quick response is crucial for systems where uptime is critical, such as hospitals or data centers. The specified 5 minutes to return to the preferred source (source 1) showcases the design's careful consideration of safety and system stability. During this time, the system can assess the reliability of the original power source before switching back, ensuring that the transition is secure and that the primary source is fully operational before re-engaging it.

This time allocation, specifically for the ATC300, distinguishes it from other options which may either misrepresent the timing or refer to different operational configurations not standard to the ATC300. Understanding these times is essential for facilities management and ensuring compliance with electrical standards.