Automatic Transfer Switches (ATS): When and How to Use Them

Automatic transfer switches (ATS) are critical components for managing power supply in many applications. They detect when the primary power source fails or becomes unstable, and automatically switch the load over to a backup power source. Here are three key points about when and how to use ATS:

First, use ATS for critical systems or equipment that require constant power supply. Examples are life support systems in hospitals, air traffic control systems, and server rooms that support business-critical IT infrastructure. An ATS ensures that power is switched over to emergency backup sources like diesel generators or battery systems within a few milliseconds, avoiding any disruption.  

Second, determine if you need a "closed transition" or "open transition" ATS. A closed transition ATS transfers power so seamlessly that connected equipment won't detect a switch has occurred. This is important for very sensitive systems. An open transition ATS briefly disconnects from both power sources during the transfer, which typically lasts a few seconds. This can be acceptable for most facilities and equipment. A closed transition system tends to cost more and requires a synchronize parallel generator.

Third, properly size and select an ATS based on your needs. ATS come rated for different voltage and amperage loads. Choose a model that can handle the peak capacity of your critical systems and expected future growth. Also consider options like: number of power sources, switch over time from primary to backup power, switch over control mechanism (automatic or manual), and any monitoring or control software. Properly sizing and selecting an ATS will ensure continuous and clean power for all your critical operations.

In summary, automatic transfer switches are very useful for organizations relying on constant and consistent power. By determining critical systems, transition type, sizing and options, you can choose an ATS solution to match your power security needs. With an ATS, you'll have confidence in access to backup power whenever the primary source fails.