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Cummins A051Y421 RS40 40kw Power Quiet Connect™ Series Liquid Cooled 3 Phase 120/240V Home Standby Generator LP/NG New

CumminsModel A051Y421

Cummins A051Y421 RS40 40kw Power Quiet Connect™ Series Liquid Cooled 3 Phase 120/240V Home Standby Generator LP/NG

  • Peak40 kW
  • Running32 kW
  • FuelNG / LP
  • StartAutomatic
Black Friday price
$12,549.00

Black Friday price ends in —

In stock Ships within 24 hours

Free delivery Thu, Nov 5 – Tue, Nov 10 if you order today, by Expedited LTL freight to your curb or driveway.

Other versions of this model

This one$12,549.00A051Y419$12,549.00A051Y424 · 480V$12,549.00A051Y420 · 208V$12,549.00
  • Free shipping48 states + DC
  • 30-day returnsReturn shipping on us
  • Full warrantyBrand-new, from the maker
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Questions before you buy? Our small team in Wilmington, NC answers every message personally. Email [email protected]

Equipped with 2400 cc engine, the Cummins Quiet Connect RS Series 22-40kW Standby Generator is a reliable source of power for medium to large homes.

Running watts
32,000 W
Starting watts
40,000 W
Fuel
Natural gas or propane
Start
Automatic
SKU: A051Y421
Category: , , ,

Equipped with 2400 cc engine, the Cummins Quiet Connect RS Series 22-40kW Standby Generator is a reliable source of power for medium to large homes. It runs at 22,000 to 40,000 watts both on natural or propane gas with a voltage of 120/208 single phase to 277/480 three phase. The engine has a 12V automatic starting system and runs a 5-ton A/C under full preload. It features a liquid-cooled cooling system with extremely quiet operation up to 60 to 64-decibel rating at 23 feet with a Sandstone Sound Level 1 enclosure and muffler. It has 1,800 RPM designed to provide reliability and fuel efficiency.

Application & Warranty Notice:

“For use and warranted in EPA Stationary Emergency application. Not EPA certified or warranted for non-emergency, off-grid or prime power applications.”

Full specifications

BrandCummins
ModelA051Y421
Running watts32,000 W
Starting watts40,000 W
FuelNatural gas or propane
StartAutomatic
How it shipsExpedited LTL freightTo your curb or driveway, free
Order today, deliveredThu, Nov 5 – Tue, Nov 10Leaves our warehouse within 24 hours

It travels on a pallet. The carrier calls ahead to book a delivery window; please have help on hand to move it.

  1. Answer the carrier’s call to book your delivery window.
  2. Keep a clear, level spot on your driveway or at the curb for unloading.
  3. Have help on hand. Freight drivers don’t carry items onto your property.
  4. Inspect before you sign and photograph any damage. Tell us within 48 hours.

We ship to the 48 contiguous states and Washington, DC. Shipping details · 30-day free returns

Brand-new, with the full manufacturer’s warranty. The terms are set by Cummins and included in the box. If something goes wrong, contact us first: we confirm the next steps within 2 business days and help you file the claim.

Home standby checklist
  • Installation is not included. Use a licensed electrician and, for the gas line, a licensed gas contractor, with local permits.
  • Register the unit with the manufacturer after installation; some brands shorten the warranty if you don’t.
  • Keep the paperwork: order confirmation, installer’s invoice and permit sign-off.
  • Follow the maintenance schedule in the owner’s manual.

How warranty claims work

What it can run

32,000 W running, 40,000 W starting

Pick what you want to power at the same time.

Typical wattages – check the label on your own appliances. Where only one figure is published, running watts are estimated at 80% of the starting figure. Connect to house circuits only through a transfer switch or interlock fitted by a licensed electrician.

Compare similar generators

Same power class, side by side.

SpecificationCummins A051Y421 RS40 40kw Power Quiet Connect™ Series Liquid Cooled 3 Phase 120/240V Home Standby Generator LP/NGThis generator$12,549.00Generac Protector XG Series XG04045ANAX 40kW Liquid Cooled 1 Phase 120/240V Standby Generator$15,529.00Kohler 38RCLC-QS1 38KW 120/240V Single Phase Standby Generator with App Connect$14,929.00
Running watts32,000 W32,000 W30,400 W
Starting watts40,000 W40,000 W38,000 W
FuelNatural gas or propane——
StartAutomaticAutomaticAutomatic
LinkYou are hereView →View →

Questions and answers

Answered by our team in Wilmington. Can’t find yours? Ask below.

Can I connect this generator to my house?
Only through a transfer switch or an interlock kit installed by a licensed electrician. Never plug a generator into a wall outlet: it can back-feed the utility line and endanger line workers. Connecting safely.
What can it run at the same time?
Use the What it can run planner above: tick your appliances and it checks both the running load and the start-up surge against this generator.
Does it ship with oil?
It depends on the manufacturer. If oil is included it is listed under What’s in the box; otherwise use the grade given in the owner’s manual before the first start.
Can I use it in the rain?
Not uncovered. Run it on a dry surface under an open, canopy-like cover, at least 20 feet from doors, windows and vents, and never in a garage.
Is installation included?
No. A home standby generator needs a licensed electrician, a licensed gas contractor for the fuel line and local permits. Delivery to your curb or driveway is free.
How will it be delivered?
Free, by Expedited LTL freight to your curb or driveway, usually within 2–5 business days after it ships. It travels on a pallet. The carrier calls ahead to book a delivery window; please have help on hand to move it.
What if it arrives damaged?
Photograph it and email us within 48 hours of delivery. We replace or refund damaged items at no cost to you.
Ask a questionWe reply personally by email.

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