What is an Automatic Transfer Switch?

An automatic transfer switch (ATS) is the control device that makes standby generators truly automatic. It continuously monitors your utility power and, within seconds of detecting an outage, signals your generator to start, waits for stable output, then seamlessly transfers your home's electrical load from the utility to the generator. Without an ATS, you would need to manually start your generator and flip breakers during every outage—defeating the purpose of a standby backup system.

How an Automatic Transfer Switch Works

1

Continuous monitoring—the ATS constantly monitors utility voltage and frequency 24/7

2

Outage detection—when utility power drops below acceptable levels, the ATS recognizes an outage

3

Generator start signal—the ATS sends a start command to your generator

4

Transfer to generator—once output is stable, the ATS connects your home to the generator

5

Return transfer—when utility returns, the ATS transfers back and signals generator shutdown

Transfer Switch Options

Whole-House ATS

Powers your entire electrical panel—every circuit, every outlet, no limitations.

Essential Circuits ATS

Powers selected critical circuits—smaller generator, lower cost, some limitations.

Service Entrance Rated

Required when ATS is installed between meter and main panel.

Load Management

Smart load shedding allows smaller generators to power more circuits sequentially.

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