The Differences Between Automatic Transfer Switches & Interlock Switches

If your business depends on uninterrupted power, you likely have generators standing by to provide power in the event of an outage. When an outage occurs, a reliable method to switch from the main power source to a backup generator is essential. Two solutions for this are automatic transfer switches (ATS) and interlock switches. While both serve the same purpose — switching to emergency power — they differ in how they operate and their suitability for various applications. Understanding these differences can help you choose the right solution for your commercial needs.

How Does an Automatic Transfer Switch Work?

An automatic transfer switch (ATS) is designed to seamlessly transition power from the main electrical supply to a backup generator without manual intervention. The ATS continuously monitors the main power source, and when it detects an outage or instability, it automatically starts the generator and transfers the load. Once the utility power is restored and stable, the ATS reverses the process, switching back to the main power source and shutting down the generator.

How Does an Interlock Work?

Unlike an ATS, an interlock switch requires manual operation. An interlock system allows users to connect a generator to a building’s electrical panel, but it requires someone to manually switch the power from the main supply to the backup generator. This system ensures that the main power and generator power can’t be connected simultaneously, preventing potential hazards.

Is a Transfer Switch or Interlock Better for Commercial Use?

Due to their simpler design and lower cost, interlocks are more commonly found in residential or light commercial settings. However, the need for manual operation can limit their effectiveness in commercial settings that require uninterrupted power, as they rely on an available, knowledgeable individual to handle the switch during a power outage. This can lead to delays and potential disruptions, especially in industries where uptime is critical.

Compared to interlock systems, ATS devices are more complex and expensive. However, this complexity translates to a significant advantage: automatic operation. There’s no need for manual handling, which means businesses can have continuous and reliable power without requiring on-site personnel to initiate the switch. Industries such as data centers, healthcare, education, distribution manufacturing and warehousing, and government demand uninterrupted power. An ATS guarantees a seamless transition without the need for manual intervention, providing peace of mind that operations will continue without a hitch.

For commercial facilities that can’t afford power delays, the automated, hands-off approach of an ATS is the better choice.

Choose Salient for the Best in Emergency Power Solutions

Salient leads the field of emergency power solutions with a commitment to precision engineering, safety, and performance. We manufacture automatic transfer switches to equip your commercial or industrial facility with the most reliable systems on the market, providing power solutions that meet the highest industry standards. Don’t leave your commercial facility’s power needs to chance — Salient delivers solutions that keep your operations running smoothly, no matter what.

Contact Salient today to learn more about our custom emergency power solutions.