Generac RXSW100A3 100A Service-Entrance Automatic Transfer Switch (NEMA 3R)
warranty
dealer
support
At a glance
- Amperage
- 100A
- Voltage/Phase
- 120/240V, single-phase
- Service Entrance Rated
- Yes
- Enclosure
- NEMA 3R aluminum (indoor/outdoor)
- Transition Type
- Open transition
- Withstand Rating
- 10,000A
- Lug Range
- 2/0 - #14
- Listings
- ETL Listed (ETLus)
- Dimensions
- 20.0" H x 14.6" W x 7.1" D
- Weight
- 22.5 lbs (10.2 kg)
- Warranty
- 5-year limited
Why this generator
- Service-entrance rated to double as your main utility disconnect — ships with a dead front for a code-compliant install
- Integrated Smart A/C Module manages up to 4 HVAC loads with no extra hardware, expandable to 8 more loads with Smart Management Modules
- Rugged aluminum NEMA 3R enclosure with baked powder-coat finish, rated for indoor or outdoor mounting
- Heavy-duty ETL-recognized Generac contactor with a 10,000A withstand rating
- Pairs with Generac home standby generators using Evolution or Nexus controllers for fully automatic transfer in an outage
- Can be operated manually without power and is backed by a 5-year limited warranty
Everything you need to know
Generac RXSW100A3 100a service-entrance automatic transfer switch (NEMA 3R enclosure). 120/240V single-phase, designed to pair with Generac air-cooled home standby generators.
Genuine Generac unit from a factory-authorized dealer. Free shipping to the lower 48. Professional installation available in NC & SC.
Frequently asked questions
Is this a genuine OEM part?+
Yes — sold and shipped as a genuine Generac part from a factory-authorized dealer.
Will it fit my unit?+
Check your model and year — message us with that info and we'll confirm fit before you order.
How fast does it ship?+
Free shipping to the lower 48. Most accessories and parts ship within 2–4 business days.
What's the return policy?+
30-day returns on unused parts and accessories in original packaging.
Free curbside shipping
Liftgate delivery to the lower 48. Most orders leave the warehouse in 3–5 business days.
Install help, no upsell
We size, spec, and connect you with a vetted local installer — or talk your contractor through it for free.
Real Cummins warranty
Full 5-year / 2,000-hour limited warranty — registered and supported through Cummins directly.