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How Does an Automatic Transfer Switch Work on a Home Generator?

July 19, 2024      

South Shore Generator Sales & Service - Automatic Transfer Switch

An Automatic Transfer Switch (ATS) is a crucial component in a standby generator installation that allows for the automatic switching of electrical loads between the utility power source and the generator.

Operation

When the utility power is interrupted or drops below a preset level, the generator starts and signals the ATS to switch the load from utility to generator power. The generator controller continues to monitor utility power conditions and signals the ATS to re-transfer the electrical load back to utility power when it recognizes the return of utility voltage. Communication is dictated by the generator controller using the N1 and N2 wires for sensing, and the 23 and 194 wires to perform the actual transfer of loads.

Maintenance and testing

Regular maintenance and testing of the ATS are important to ensure the reliable and safe operation of the standby generator. Note that during a generator exercise, a transfer of loads does not occur during the exercise cycle unless utility power is lost. To test the operation of a transfer switch, a homeowner can simulate a power outage.

Need more information? Learn more at South Shore Generator Sales & Service, contact us.


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Whether your need is to power your business to keep on your production schedule or your home to keep your family safe and sound;.South Shore Generator has the product diversity to meet all of your generator requirements. We are proud to sell and service generators from 2kW to 2000kW single set units and up to as large as 100MW utilizing Generac's innovative Modular Power Systems (MPS).

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