Generac RXSW150A3 150A Service-Entrance Automatic Transfer Switch (NEMA 3R)
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At a glance
- Amperage
- 150A
- Voltage/Phase
- 120/240V single-phase
- Service Entrance Rated
- Yes
- Enclosure
- NEMA 3R aluminum (indoor/outdoor)
- Transition Type
- Open transition (automatic)
- Listings
- ETL Listed (ETLus)
- Withstand Rating
- 22,000A
- Lug Range
- 250 MCM - #6
- Dimensions
- 30.0"H x 13.5"W x 6.3"D
- Weight
- 39 lbs (17.7 kg)
- Warranty
- 5-year limited
Why this generator
- Service-entrance rated 150A Smart Switch doubles as your service disconnect, simplifying installation and saving panel space
- Built-in Smart A/C Module manages up to 4 HVAC loads with no extra hardware, so a smaller generator can power more of your home
- Expandable load management: add external Smart Management Modules to control up to 8 additional loads
- Rugged aluminum NEMA 3R enclosure with baked powder-coat finish, rated for outdoor installation
- Heavy-duty 22,000A withstand-rated Generac contactor, ETL listed for years of reliable service
- Seamless pairing with Generac Evolution and Nexus controller home standby generators, backed by a 5-year limited warranty
Everything you need to know
Generac RXSW150A3 150a 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.