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Cummins RS40 Standby Generators 40kW - 240V | Portlandia Electric Supply
Cummins RS40 Standby Generators 40kW - 240V | Portlandia Electric Supply
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Cummins RS40 - 40kW Quiet Connect Series 120/240V Three Phase Liquid Cooled Standby Generator - A051Y421

Cummins RS40 - 40kW Quiet Connect Series 120/240V Three Phase Liquid Cooled Standby Generator - A051Y421

$19,927.10 USD
$ $19,927.10 USD
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9+ sold

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Unlimited lifetime support, always available.

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What is your return policy?

Returns are free in the first 30 days with no restocking or processing fees, although the customer may be responsible for paying return shipping. See our complete return policy on our Shipping, Delivery, and Returns page linked in the footer of this website.

What’s covered by your return policy?

Our returns policy covers all purchases made through Portlandia Electric Supply. For warranty issues, as authorized distributors, we honor the full manufacturer warranty of ALL the brands on our website. See our complete returns and warranty policies on our Shipping, Deliver, and Returns page.

How long will it take to receive my order?

All orders are processed within 72 hours and you can expect delivery on most orders within 5-7 business days. You will receive access to our customer portal after ordering, where it is easy to track all your shipments. See our Shipping, Delivery and Returns page for more details.

What are your financing and payment options?

We offer several ways to pay to make getting your solar kit simple:

Credit Card: if the purchase is greater than your card’s limit, you can split the cost onto multiple cards as well as Paypal, financing through Affirm, and ACH/bank transfer

You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

How does your Lifetime Customer Support work?

Our legendary lifetime customer support has helped make us the #1 online solar retailer! We have a dedicated team of solar professionals standing by to help you navigate the world of solar with ease. From selecting the perfect solar kit to installation and beyond, we provide support and expertise at every step of the journey.If you need help with ordering, shipping, troubleshooting, expanding your system, warranty issues, or anything else you have questions about for as long as you own your Portlandia Electric Supply equipment, we’ve got you covered: we’re always only a phone call or email away.

Cummins RS40 - 40kW Quiet Connect Series 120/240V Three Phase Liquid Cooled Standby Generator - A051Y421

The Cummins RS40 Quiet Connect Series Standby Generator delivers powerful 40kW of backup power in a 120/240V three phase configuration, engineered to keep your commercial facility operational when the grid fails. This commercial-grade generator protects critical operations, business continuity, and revenue streams during utility outages. With advanced Quiet Connect technology, the RS40 operates at remarkably low noise levels, ensuring minimal disruption to your business environment or neighborhood. Built on Cummins' legendary reliability with liquid-cooled performance, this generator operates flawlessly in extreme environmental conditions from scorching heat to arctic cold down to -40°F, ensuring your business stays operational when customers need you most.

Key Features

  • 40kW standby power output provides substantial commercial backup capacity for demanding business operations
  • 120/240V three phase system delivers efficient, balanced power distribution for commercial electrical systems
  • Dual fuel capability (Natural Gas/LP) field-selectable at installation for maximum operational flexibility and fuel security
  • Liquid-cooled 2.4L Inline 4-Cylinder Cummins running at 1800 RPM ensures exceptional longevity and performance under sustained loads
  • Quiet Connect technology with advanced sound-dampening enclosure minimizes operational noise
  • PowerCommand 1.1 with Self-Diagnostics with industry-leading self-diagnostics and optional remote monitoring capabilities
  • Extreme cold weather capability with reliable starting down to -40°F when properly equipped with optional accessories
  • Flexible exercise mode allows customizable testing schedules as infrequent as 2 minutes every 6 months, reducing fuel consumption and emissions
  • Commercial-grade performance handles substantial electrical loads including HVAC, lighting, and machinery
  • Durable powder-coated aluminum enclosure withstands wind loads up to 180 MPH per ASCE 7-10 standards
  • Professional enclosure design suitable for commercial facility installations

Specifications

MPN A051Y421
Vendor Cummins
Model RS40
Power Output 40kW Standby
Voltage 120/240V
Phase Type Three-Phase
Fuel Type Natural Gas / LP (Dual Fuel, Field Selectable)
Engine 2.4L Inline 4-Cylinder Cummins
Cooling Type Liquid-Cooled
RPM 1800
Alternator 60 Hz, 3 Phase, 12 Lead
Control System PowerCommand 1.1 with Self-Diagnostics
Sound Level 65-70 dBA @ 23 ft (Sound Level 1 Enclosure)
Voltage Regulation ±1%
Frequency Regulation ±0.25%
Cold Weather Start -40°F (with optional accessories)
Wind Load Rating 180 MPH (ASCE 7-10)
Enclosure Type Advanced Aluminum with Powder Coat Finish
Application Small to Medium Commercial Backup Power

Installation & Application

The Cummins RS40 120/240V Three-Phase Liquid Cooled Standby Generator is engineered for commercial facilities that demand reliable, high-capacity three-phase backup power. With its 40kW capacity, the RS40 handles significant commercial electrical loads including HVAC systems, lighting, refrigeration, security systems, servers, and essential business machinery during extended utility outages. The liquid-cooled design maintains peak performance even under maximum sustained loads, while the PowerCommand 1.1 with Self-Diagnostics provides automatic monitoring, self-diagnostics, and seamless transfer switching for worry-free operation. The dual fuel capability provides strategic flexibility based on your fuel infrastructure and availability. Professional installation by a certified commercial electrician ensures proper three-phase load balancing, safety compliance with local codes, and NFPA 110 capability when equipped with appropriate accessories.

Warranty & Compliance

  • Backed by Cummins' comprehensive 2-year or 400-hour limited warranty (whichever comes first) with extended warranty options available up to 10 years
  • EPA emissions certified for emergency stationary use per 40CFR60 requirements
  • UL-2200 Listed for safety and reliability in commercial stationary standby applications
  • IBC Seismic certified for earthquake-prone regions
  • NFPA 110 capable when equipped with necessary accessories and properly installed
  • Meets ASCE 7-10 wind load requirements up to 180 MPH

Customer Reviews

Be the first to write a review
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(0)
0%
(0)
0%
(0)
0%
(0)
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What is your return policy?

Returns are free in the first 30 days with no restocking or processing fees, although the customer may be responsible for paying return shipping. See our complete return policy on our Shipping, Delivery, and Returns page linked in the footer of this website.

What’s covered by your return policy?

Our returns policy covers all purchases made through Portlandia Electric Supply. For warranty issues, as authorized distributors, we honor the full manufacturer warranty of ALL the brands on our website. See our complete returns and warranty policies on our Shipping, Deliver, and Returns page.

How long will it take to receive my order?

All orders are processed within 72 hours and you can expect delivery on most orders within 5-7 business days. You will receive access to our customer portal after ordering, where it is easy to track all your shipments. See our Shipping, Delivery and Returns page for more details.

What are your financing and payment options?

We offer several ways to pay to make getting your solar kit simple:

Credit Card: if the purchase is greater than your card’s limit, you can split the cost onto multiple cards as well as Paypal, financing through Affirm, and ACH/bank transfer

You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

How does your Lifetime Customer Support work?

Our legendary lifetime customer support has helped make us the #1 online solar retailer! We have a dedicated team of solar professionals standing by to help you navigate the world of solar with ease. From selecting the perfect solar kit to installation and beyond, we provide support and expertise at every step of the journey.If you need help with ordering, shipping, troubleshooting, expanding your system, warranty issues, or anything else you have questions about for as long as you own your Portlandia Electric Supply equipment, we’ve got you covered: we’re always only a phone call or email away.

Cummins RS40 - 40kW Quiet Connect Series 120/240V Three Phase Liquid Cooled Standby Generator - A051Y421

The Cummins RS40 Quiet Connect Series Standby Generator delivers powerful 40kW of backup power in a 120/240V three phase configuration, engineered to keep your commercial facility operational when the grid fails. This commercial-grade generator protects critical operations, business continuity, and revenue streams during utility outages. With advanced Quiet Connect technology, the RS40 operates at remarkably low noise levels, ensuring minimal disruption to your business environment or neighborhood. Built on Cummins' legendary reliability with liquid-cooled performance, this generator operates flawlessly in extreme environmental conditions from scorching heat to arctic cold down to -40°F, ensuring your business stays operational when customers need you most.

Key Features

  • 40kW standby power output provides substantial commercial backup capacity for demanding business operations
  • 120/240V three phase system delivers efficient, balanced power distribution for commercial electrical systems
  • Dual fuel capability (Natural Gas/LP) field-selectable at installation for maximum operational flexibility and fuel security
  • Liquid-cooled 2.4L Inline 4-Cylinder Cummins running at 1800 RPM ensures exceptional longevity and performance under sustained loads
  • Quiet Connect technology with advanced sound-dampening enclosure minimizes operational noise
  • PowerCommand 1.1 with Self-Diagnostics with industry-leading self-diagnostics and optional remote monitoring capabilities
  • Extreme cold weather capability with reliable starting down to -40°F when properly equipped with optional accessories
  • Flexible exercise mode allows customizable testing schedules as infrequent as 2 minutes every 6 months, reducing fuel consumption and emissions
  • Commercial-grade performance handles substantial electrical loads including HVAC, lighting, and machinery
  • Durable powder-coated aluminum enclosure withstands wind loads up to 180 MPH per ASCE 7-10 standards
  • Professional enclosure design suitable for commercial facility installations

Specifications

MPN A051Y421
Vendor Cummins
Model RS40
Power Output 40kW Standby
Voltage 120/240V
Phase Type Three-Phase
Fuel Type Natural Gas / LP (Dual Fuel, Field Selectable)
Engine 2.4L Inline 4-Cylinder Cummins
Cooling Type Liquid-Cooled
RPM 1800
Alternator 60 Hz, 3 Phase, 12 Lead
Control System PowerCommand 1.1 with Self-Diagnostics
Sound Level 65-70 dBA @ 23 ft (Sound Level 1 Enclosure)
Voltage Regulation ±1%
Frequency Regulation ±0.25%
Cold Weather Start -40°F (with optional accessories)
Wind Load Rating 180 MPH (ASCE 7-10)
Enclosure Type Advanced Aluminum with Powder Coat Finish
Application Small to Medium Commercial Backup Power

Installation & Application

The Cummins RS40 120/240V Three-Phase Liquid Cooled Standby Generator is engineered for commercial facilities that demand reliable, high-capacity three-phase backup power. With its 40kW capacity, the RS40 handles significant commercial electrical loads including HVAC systems, lighting, refrigeration, security systems, servers, and essential business machinery during extended utility outages. The liquid-cooled design maintains peak performance even under maximum sustained loads, while the PowerCommand 1.1 with Self-Diagnostics provides automatic monitoring, self-diagnostics, and seamless transfer switching for worry-free operation. The dual fuel capability provides strategic flexibility based on your fuel infrastructure and availability. Professional installation by a certified commercial electrician ensures proper three-phase load balancing, safety compliance with local codes, and NFPA 110 capability when equipped with appropriate accessories.

Warranty & Compliance

  • Backed by Cummins' comprehensive 2-year or 400-hour limited warranty (whichever comes first) with extended warranty options available up to 10 years
  • EPA emissions certified for emergency stationary use per 40CFR60 requirements
  • UL-2200 Listed for safety and reliability in commercial stationary standby applications
  • IBC Seismic certified for earthquake-prone regions
  • NFPA 110 capable when equipped with necessary accessories and properly installed
  • Meets ASCE 7-10 wind load requirements up to 180 MPH
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Customer Success Stories

Troy P

EG4 off-grid base kit, Happy with my purchase.

This is the first stage of my three planned purches. I got the eg4 inverter 6000 XP base kit with six 400 watt panels and the two server rack batteries. Did a little online research and followed the instructions and it got set up without any issues. Right now I'm just running it in my garage on a single outlet and have been running dual 750 watt water distillers with it. Once I get the second inverter and a bunch more panels and batteries, I plan on attaching it to my subpanel in my house that has my lights and outlets and appliances on it. Then I'll get a soft start for my AC and blower and run it on my main panel.

Jacob B

Easy Process, Genuine Support

Trying to pick the correct solar system for your needs can be very technical and frustrating. I wanted to thank Yvhan and the Portlandia Electric supply team for their patience and helpful attitudes through multiple calls. I feel like we were able to narrow it down to what worked for me and my family. My system works great and I couldn't be happier to have picked Portlandia Electric Supply.

Patrick B

Off Grid Solar Purchase

I wanted to get an offgrid solar system for years but didn’t know where to start. I found Portlandia Electric Supply on Facebook and decided to submit a quote. Within 24 hours I had a custom proposal that was almost half the price of the companies I had previously got quotes from. My wife and I decided to order online and the kit came in a timely manner and it was an easy install. Great company to work with!

James Martin

Highly Recommend

I would like to take the time to express the outstanding service that I was provided with by Portlandia Electric Supply. They provided me with all the answers to my questions, and after reviewing our quote over the phone I felt comfortable proceeding to order my kit. It’s exactly what I needed and they were there to help us over the phone when we had questions installing it. I highly recommend others in need to choose Portlandia Electric Supply.

Brian H

Solar Kit for Mobile Work Van

As a professional videographer, I needed reliable power on the go.Portlandia Electric Supply Delta Pro and roof-mounted panels were the perfect solution. Setup was easy, and the kit included everything needed. The Delta Pro powers my cameras, lights, laptop, and a small fridge with impressive battery capacity.

Keith S

Best Tech Support

You folks have been wonderful guiding me through the ins and outs of going solar. Plus your tech guys Rod and Nelson are the absolute best. They explained all the different aspects of inverters, batteries and how to keep them in top condition. Too much more to put here… but no other company has the 100% tech support you provide for your customers!

Coll A

Great Experience

My experience with Portlandia Electric Supply has been excellent. Before the sales, they answered all my questions to assure that I got what I needed. After the sales they continued to support me with answers and help. I had a warranty issue with a unit, and it was handled as well as possible. I would recommend them to anyone looking to go solar.

Troy P

EG4 off-grid base kit, Happy with my purchase.

This is the first stage of my three planned purches. I got the eg4 inverter 6000 XP base kit with six 400 watt panels and the two server rack batteries. Did a little online research and followed the instructions and it got set up without any issues. Right now I'm just running it in my garage on a single outlet and have been running dual 750 watt water distillers with it. Once I get the second inverter and a bunch more panels and batteries, I plan on attaching it to my subpanel in my house that has my lights and outlets and appliances on it. Then I'll get a soft start for my AC and blower and run it on my main panel.

Jacob B

Easy Process, Genuine Support

Trying to pick the correct solar system for your needs can be very technical and frustrating. I wanted to thank Yvhan and the Portlandia Electric supply team for their patience and helpful attitudes through multiple calls. I feel like we were able to narrow it down to what worked for me and my family. My system works great and I couldn't be happier to have picked Portlandia Electric Supply.

Patrick B

Off Grid Solar Purchase

I wanted to get an offgrid solar system for years but didn’t know where to start. I found Portlandia Electric Supply on Facebook and decided to submit a quote. Within 24 hours I had a custom proposal that was almost half the price of the companies I had previously got quotes from. My wife and I decided to order online and the kit came in a timely manner and it was an easy install. Great company to work with!

James Martin

Highly Recommend

I would like to take the time to express the outstanding service that I was provided with by Portlandia Electric Supply. They provided me with all the answers to my questions, and after reviewing our quote over the phone I felt comfortable proceeding to order my kit. It’s exactly what I needed and they were there to help us over the phone when we had questions installing it. I highly recommend others in need to choose Portlandia Electric Supply.

Brian H

Solar Kit for Mobile Work Van

As a professional videographer, I needed reliable power on the go.Portlandia Electric Supply Delta Pro and roof-mounted panels were the perfect solution. Setup was easy, and the kit included everything needed. The Delta Pro powers my cameras, lights, laptop, and a small fridge with impressive battery capacity.

Keith S

Best Tech Support

You folks have been wonderful guiding me through the ins and outs of going solar. Plus your tech guys Rod and Nelson are the absolute best. They explained all the different aspects of inverters, batteries and how to keep them in top condition. Too much more to put here… but no other company has the 100% tech support you provide for your customers!

Coll A

Great Experience

My experience with Portlandia Electric Supply has been excellent. Before the sales, they answered all my questions to assure that I got what I needed. After the sales they continued to support me with answers and help. I had a warranty issue with a unit, and it was handled as well as possible. I would recommend them to anyone looking to go solar.

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Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

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