Automatic Transfer Switch (ATS)

How does a generator transfer switch work?


When utility power fails, your home standby generator starts automatically and the automatic transfer switch connects it to your home’s electrical system. Which enables it to maintain power to your most vital appliances such as your air conditioner, refrigerator, freezer, heater, medical devices, sump pump, and wall outlets.

When utility power is restored, the ATS will disconnect the power from the generator and reconnect your home to utility power, requiring you to do nothing. After your generator is no longer needed for power, it will automatically cool down and shut down until it’s needed again. 

Additionally, with the Cummins Cloud Connect app you can remotely monitor your home standby unit from the safety and comfort of your home.

Cummins offers multiple transfer switch options for our full range of home generators. Your local Cummins dealer will help you identify the correct solution for your specific generator transfer switch installation needs.

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ATS At-a-Glance


  • Does all the work, so you don’t have to look for your generator in the dark
  • Automatically switches your home's power source to your generator when utility power fails
  • Automatically switches back to utility power when the outage is over

Automatic Transfer Switch Models & Power Ratings

Model Rating (Amps) Voltage Enclosure Dimensions (H x W x D) Weight Spec Sheet
RA 100 NSE 100 120/240V 1 phase 3R 24.0 x 17.0 x 7.4 in (619 x 433 x 187 mm) 33 lbs / 15 kg NAS-5810-EN
RA 200 NSE 200 120/240V 1 phase 3R 27.1 x 18.2 x 7.4 in (688 x 463 x 187 mm) 46 lbs / 21 kg NAS-5810-EN
RA 400 NSE 400 120/240V 1 phase 3R - Aluminum 36.9 x 24.9 x 11.1 in (937 x 633 x 282 mm) 64.5 lbs / 29.3 kg NAS-5810-EN
RA 100 SE 100 120/240V 1 phase 3R 23.3 x 19.8 x 7.2 in (591 x 503 x 182 mm) 58 lbs / 26 kg NAS-5810-EN
RA 200 SE 200 120/240V 1 phase 3R 23.3 x 19.8 x 7.2 in (591 x 503 x 182 mm) 58 lbs / 26 kg NAS-5810-EN
RA 400 SE 400 120/240V 1 phase 3R - Aluminum 47.9 x 23.4 x 11.3 in (1217 x 594 x 287 mm) 95.6 lbs / 43.4 kg NAS-5810-EN