Cummins RA400 400A Non-Service-Entrance Automatic Transfer Switch
OEM part
dealer
support
At a glance
- Amperage
- 400 A
- Poles
- 2-Pole
- Voltage
- 120/240V
- Phase
- Single Phase
- Frequency
- 60 Hz
- Service Entrance Rated
- No (NSE / Non-Service Entrance)
- Enclosure
- NEMA Type 3R, Aluminum (outdoor-rated)
- Dimensions (L x W x H)
- 36.9 in x 24.9 in x 11.1 in
- Weight
- 64.5 lbs
- UL Listing
- UL 1008 Listed
- Warranty
- 2-Year Limited Warranty
Not sure if this fits?
Why this generator
- 400-amp, 2-pole automatic transfer switch for 120/240V single-phase residential and light-commercial standby power
- Monitors utility power 24/7 and automatically transfers the electrical load to the generator when power fails, then back when stable utility returns
- Break-before-make design with mechanical and electrical interlocks safely isolates generator power from utility power
- Durable aluminum NEMA Type 3R enclosure rated for outdoor installation
- UL 1008 listed for transfer switch safety and built for Cummins Connect Series (RS/RX) home standby generators
- Backed by a 2-year limited warranty
Everything you need to know
400A, 240Vac, 2-Pole, NEMA 3R enclosure (For Cummins Connect Series Generators Only)
Highlights
- Factory-authorized Cummins dealer
- MAP pricing — no hidden markup
- Whole-home standby coverage
- Expert sizing & installation available across NC & SC
Part Number: A050W633
Ships via calculated freight — shipping shown at checkout (heavy/hazmat item).
Frequently asked questions
Is this a genuine OEM part?+
Yes — sold and shipped as a genuine Cummins 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. Typically ships in less than 2 weeks.
Install help, no upsell
We size, spec, and connect you with a vetted local installer — or talk your contractor through it for free.
Genuine Cummins part
Sold and shipped as a genuine Cummins OEM part from a factory-authorized dealer. 30-day returns on unused parts in original packaging.