Cummins A051Y421 RS40 40kw Power Quiet Connect™ Series Liquid Cooled 3 Phase Home Standby Generator LP/NG New
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.
Features
- Reliable Cummins Engine - QSJ2.4 engine for reliable power
- Robust Product Design and Testing
- Flexible Exercise mode duration that suits the customer's preference - as little as 2 minutes every 6 months
- Advanced Enclosure Design capable of withstanding winds up to 150 MPH
- Self diagnostics and easy service
- Control Systems - PowerCommand 1.1 control with 128 x 64 backlit LED display for improved user experience
- Brushless Proven Alternator
- Sound Attenuated - aluminum enclosure material plus durable powder coat paint
- Limited Base Warranty - 2 Years/400 Hours Standby
Specifications
| Manufacturer's Warranty |
2 Yr Consumer Limited |
| Rated Watts |
40,000 |
| Voltage |
3 phase (208/240/480v) |
| Start Type |
Automatic w/ transfer switch (not included) |
| Engine |
Cummins Onan |
| Engine Displacement |
2.4L |
| Decibel Level @ 23 ft. |
63db |
| Fuel Consumption (NG) |
519 cu.ft/hr (full load) 304.7 cu.ft/hr (half load) |
| Fuel Consumption (LP) |
5.4 gal/hr (full load) 3.4 gal/hr (half load) |
| Fuel Type |
Liquid Propane or Natural Gas |
What Our Experts Think
The Cummins A051Y421 RS40 40kW Quiet Connect™ Series Home Standby Generator is the ultimate solution for homeowners seeking powerful, reliable backup power. Here’s why it’s an outstanding choice:
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Massive 40kW Output: Provides 40kW of continuous power, ideal for large homes or commercial applications with high energy demands, keeping critical systems running during an outage.
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Dual Fuel Flexibility: Runs on both LP and Natural Gas (NG), providing flexibility and extended runtime during emergencies.
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Liquid-Cooled Engine: Designed with a liquid-cooled engine for maximum efficiency, longer lifespan, and quieter operation compared to air-cooled generators.
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Three-Phase Power: Delivers stable, balanced three-phase 120/208V power, ideal for large residential or commercial properties that require consistent electricity.
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Quiet Operation: Features advanced noise-reduction technology, ensuring minimal disruption during use, even in noise-sensitive environments.
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Automatic Transfer Switch: Instantly detects power outages and switches to generator power without any manual intervention, ensuring continuous electricity for your home.
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Weather-Resistant: Built with a weather-resistant enclosure to provide reliable performance in all environmental conditions.
Q&A
Q: What is the power output?
A: 40kW, providing reliable backup power for large homes or businesses.
Q: What type of cooling system does it use?
A: It is liquid-cooled, offering quieter operation and more efficient cooling for longer run times.
Q: What fuel types does it support?
A: Compatible with both LP (liquid propane) and NG (natural gas) for versatile fueling options.
Q: What is the voltage configuration?
A: Three-phase output, ideal for more demanding residential or commercial applications.
Q: How quiet is it?
A: The Quiet Connect™ Series ensures low noise levels, making it suitable for residential areas.
Q: Why choose this generator?
A: With 40kW of power, dual-fuel capability, and liquid cooling, it’s perfect for high-demand standby power applications.
Q: What makes it reliable?
A: Built with Cummins’ trusted engineering for consistent, efficient performance during power outages.
Maintenance Tips
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Oil Changes: Replace the oil every 150 hours or annually to maintain engine performance and longevity.
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Air Filter Maintenance: Inspect and clean or replace the air filter every 100 hours or sooner if necessary to ensure optimal airflow.
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Fuel System Care: Use clean LP or NG, and regularly inspect fuel lines and connections for leaks or damage.
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Spark Plug Inspection: Check and replace spark plugs periodically to ensure efficient ignition and optimal engine performance.
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Battery Maintenance: Maintain the battery charge, and clean terminals to avoid corrosion and ensure reliable startup.
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Coolant Level Checks: Regularly check coolant levels and inspect hoses for any leaks to prevent overheating and engine damage.
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Exercise the Generator: Run the generator for 20-30 minutes monthly to keep internal components lubricated and prevent stale fuel.
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Transfer Switch Testing: Test the automatic transfer switch to ensure seamless operation and proper power transition from the grid to the generator.
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Three-Phase System Inspection: Inspect the three-phase system for secure connections and ensure consistent voltage output.
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Storage: Store the generator in a cool, dry, well-ventilated area, away from extreme temperatures and moisture.
Damage 
Loss 
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