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
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?+
Shipping is 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
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 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.