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
Not sure if this fits?
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. Ships via calculated freight — shipping shown at checkout (heavy/hazmat item). 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?+
Low cost ground shipping — calculated at checkout (batteries, transfer switches and oversized items). Most leave the warehouse in 2–4 business days.
What's the return policy?+
30-day returns on unused parts and accessories in original packaging.
Fast nationwide shipping
Low cost ground shipping — calculated at checkout. Most items leave the warehouse in 2–4 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.
Genuine Generac part
Sold and shipped as a genuine Generac OEM part from a factory-authorized dealer. 30-day returns on unused parts in original packaging.