Generac 9935 100A Non-Service-Entrance Automatic Transfer Switch (NEMA 3R)
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At a glance
- Amperage
- 100A
- Voltage/Phase
- 120/240V, single-phase
- Service Entrance Rated
- No (non-service entrance rated)
- Enclosure
- NEMA 3R aluminum (indoor/outdoor), powder-coat finish
- Transition Type
- Open transition, automatic
- Listings
- cETLus listed
- Withstand Rating
- 10,000A
- Lug Range
- 2/0 – #14
- Dimensions
- 26.8 in H (30.0 in overall) x 13.5 in W x 6.3 in D
- Weight
- 27 lb (12.2 kg)
- Warranty
- 5-year limited
Why this generator
- 100-amp open-transition automatic transfer switching for 120/240V single-phase whole-home backup
- Non-service-entrance rated design installs downstream of your existing main disconnect
- Rugged aluminum NEMA 3R enclosure with baked powder-coat paint for indoor or outdoor mounting
- Fast Mount hanging system simplifies and speeds installation
- Pairs with Generac home standby generators using Evolution or Power Zone 200/410 controllers, which handle all timing, sensing, exercising, and transfer commands
- cETLus listed with 10,000A withstand rating and backed by a 5-year limited warranty
Everything you need to know
Generac 9935 100a non-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.