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Whether it’s a violent storm, an overloaded grid, or an unexpected blackout, the Cummins RS40 40kW Home Standby Generator ensures your home remains fully powered without interruption. No more spoiled food, no more sitting in the dark, and no more disruptions to your daily life. With automatic, seamless backup power, you can stay comfortable, secure, and connected when the grid fails.
With blackouts becoming more frequent, the Cummins RS40 40kW Home Standby Generator is the smartest investment you can make for your home. This automatic backup power solution guarantees your family’s comfort, security, and uninterrupted power—no matter the circumstances.
Operates under extreme environmental conditions, including cold weather starts at as low as -40 °F. Tested and certified per the latest EPA, UL, and IBC Seismic standards and capable of meeting NFPA110 requirements when equipped with the necessary accessories and properly installed.
Reduces unnecessary fuel consumption, emissions, and noise. The innovative, flexible exercise mode enables the generator to exercise at a time, frequency, and duration that suits your preference - as little as 2 minutes every 6 months.
The aesthetically appealing enclosure incorporates special designs that deliver the quietest generator of its kind. Aluminum material plus durable powder coat paint provides the best anti-corrosion performance. The generator set enclosure has been evaluated to withstand 180 MPH wind loads in accordance with ASCE7-10. The intelligent design has removable panels and service doors to provide easy access for service and maintenance.
Equipped with Cummins PowerCommand electronic control to provide industry-leading self-diagnostic capabilities. Critical components of the generator are designed to ensure service and preventive maintenance can be completed in a short period of time.
Runs on readily available natural gas or propane vapor, offering a convenient and cost-effective fuel source.
Provides total generator set system integration, including automatic remote starting/stopping, precise frequency and voltage regulation, alarm and status message display, output metering, auto-shutdown at fault detection, and NFPA 110 Level 1 compliance.
Aesthetically appealing enclosure incorporates special designs that deliver the quietest generator of its kind. Aluminum material plus durable powder coat paint provides the best anti-corrosion performance. The generator set enclosure has been evaluated to withstand 180 MPH wind loads in accordance with ASCE7-10. The intelligent design has removable panels and service doors to provide easy access for service and maintenance.
Cummins provides a 2-years warranty policy, ensuring the absence of defects in materials, workmanship, and performance during the warranty period.
| Design | Turbo with after cooler |
| Bore | 86.5 mm (3.4 in) |
| Stroke | 100.0 mm (3.94 in) |
| Displacement | 2.4 liters (143.5 in3) |
| Cylinder block | Cast iron, in-line 4 cylinder |
| Battery capacity | 550 amps at ambient temperature of 0 oF to 32 oF (-18 oC to 0 oC) |
| Battery charging alternator | 50 amps |
| Starting voltage | 12 volt, negative ground |
| Lube oil filter type(s) | Spin-on with relief valve |
| Standard cooling system | 50° C (122° F) ambient cooling system |
| Rated speed | 1800 rpm |
| Governor regulation class | ISO 8528 Part 1 Class G3 |
| Voltage regulation, no load to full load | ±1.0% |
| Random voltage variation | ±1.0% |
| Frequency regulation | Isochronous |
| Random frequency variation | ± 0.25% @ 60 Hz |
| Radio frequency emissions compliance | FCC code Title 47 part 15 Class B |
| Minimum fuel supply pressure, kPa (in H2O) |
1.5 (6.0) |
| Maximum fuel supply pressure, kPa (in H2O) |
3.5 (14.0) |
| Weight | 1356 lbs (615 kg) |
| Size | Length 94 in (2388 mm), width 34 in (864 mm), height 45.5 in (1156 mm) |
| Sound | 63 dB(A) at 23 ft (7 m) with sound level 2 enclosure |
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Shipping times vary depending on your location and the product or products ordered.
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