Cummins 25kW Generator Quiet Connect Series RS25 120/240 Volts 3 Phase

The Cummins 25kW Generator Quiet Connect Series RS25 120/240 Volts 3 Phase is engineered for mission-critical standby power in residential estates, light commercial buildings, agricultural facilities, and small industrial sites. Built in the USA and powered by a 2.4-liter inline 4-cylinder engine running at 1800 RPM, this generator delivers reliable, fuel-efficient performance with exceptionally low noise levels.

Designed for extreme climates and demanding environments, the RS25 provides 120/240 Volts 3-Phase output at up to 75.2 amps. It is UL-2200 listed, EPA-compliant for emergency stationary use, and configurable to meet NFPA 110 Level 1 standards with the proper accessories.

If you require dependable backup power with premium controls, durable enclosure construction, and field-selectable fuel flexibility, this model stands out in the 20–29kW range.

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Why Choose the Cummins 25kW Generator Quiet Connect Series RS25 120/240 Volts 3 Phase?

Selecting the right standby generator is not just about wattage. It’s about engine speed, voltage regulation, enclosure durability, compliance standards, and long-term serviceability.

This generator offers:

• 25kW rated output (Natural Gas or Propane)

• 120/240 Volts 3 Phase configuration

• 1800 RPM low-speed engine for longevity

• 69 dBA quiet operation

• Brushless 4-pole alternator

• ±1.0% voltage regulation

• Automatic start system

• Field-selectable fuel at installation

Unlike high-RPM portable units, the 1800 RPM configuration reduces wear and extends service life. For facilities requiring stable three-phase output for motors, compressors, HVAC systems, and shop equipment, this configuration is ideal.

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Engine and Performance Engineering

2.4 Liter Inline 4-Cylinder Cummins Engine

The liquid-cooled engine is built with a cast iron block and operates at 1800 RPM. This lower speed significantly improves:

• Durability

• Fuel efficiency

• Reduced vibration

• Quieter operation

Fuel options include:

• Natural Gas: 309.5 cu ft/hr (full load)

• Propane: 3.5 gal/hr (full load)

Fuel type is selectable during installation, offering flexibility for properties already connected to NG or using LP tanks.

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PowerCommand 1.1 Control System

The RS25 features Cummins’ advanced PowerCommand 1.1 control platform with a backlit LED display.

Key capabilities:

• Remote start/stop

• Automatic fault shutdown

• Alarm and status display

• Self-diagnostic system

• Precise frequency and voltage control

• NFPA 110 Level 1 capable (with accessories)

This system simplifies maintenance and reduces downtime. For commercial environments, this diagnostic capability is a major operational advantage.

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Quiet Connect Aluminum Enclosure Design

The Sound Level 1 aluminum enclosure provides:

• 69 dBA noise rating

• Corrosion resistance

• 180 MPH wind load rating (ASCE 7-10)

• Removable doors for service access

• Clean, professional appearance

Compared to standard steel housings, aluminum reduces corrosion risk, especially in coastal or humid regions.

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Cold Weather and Environmental Readiness

The Cummins 25kW Generator Quiet Connect Series RS25 120/240 Volts 3 Phase is equipped for extreme cold weather operation down to -40°F.

Factory-installed features include:

• Coolant heater

• Crankcase vent heater

• Large battery rack

• Flexible fuel line

These features eliminate common cold-start issues found in lower-tier standby generators.

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Electrical Output and Compliance

Electrical Specifications:

• 25kW rated watts

• 75.2 rated amps

• 120/240 Volts 3 Phase

• 60 Hertz

• Brushless 4-pole alternator

• 12-lead revolving field design

• ±1.0% automatic voltage regulation

Certifications:

• UL-2200

• EPA Emergency Stationary (40CFR60)

• IBC Seismic compliant

• NFPA 110 compatible (accessories required)

For commercial buyers, compliance is non-negotiable. This generator meets major regulatory standards.

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Comparison With Other Cummins Models

If you are evaluating voltage or phase requirements, consider comparing this model with:

• Cummins 25kW Generator Quiet Connect Series RS25 120/240 Volts 3 Phase

• Cummins RS125 Quiet Connect 125kW Generator 120/240 Volts 3 Phase

• Cummins RS125 Quiet Connect 125kW Generator 277/480 Volts 3 Phase

When to Choose 25kW vs 125kW

Choose 25kW if:

• Small commercial building

• Agricultural pumps

• Light industrial equipment

• Residential estate backup

Choose 125kW if:

• Multi-tenant facilities

• Larger manufacturing loads

• Full-building HVAC systems

• High motor starting demand

Proper load calculation is critical. Oversizing increases fuel consumption. Undersizing risks overload shutdown.

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Installation and Setup Considerations

Before installing:

1. Conduct a professional load assessment.

2. Confirm 3-phase requirement.

3. Select Natural Gas or Propane.

4. Prepare mounting pad.

5. Select compatible transfer switch.

6. Verify local permitting and inspection requirements.

A properly sized automatic transfer switch ensures seamless transition during power outages.

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Real-World Application Example

A small manufacturing workshop operating CNC equipment and HVAC systems installed the Cummins 25kW Generator Quiet Connect Series RS25 120/240 Volts 3 Phase to maintain operational continuity during grid failures.

Results:

• Zero downtime during outages

• Stable voltage output for motor loads

• Reduced noise complaints compared to previous diesel unit

• Lower maintenance costs due to 1800 RPM design

This model performs exceptionally well for motor-driven equipment requiring consistent three-phase power.

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Maintenance Strategy

For long-term reliability:

• Exercise generator every 6 months (flexible 2-minute intervals available)

• Change oil per manufacturer schedule

• Inspect fuel lines annually

• Test battery condition yearly

• Verify voltage output during service

The removable aluminum enclosure doors allow easy access, reducing service time.

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Technical Specifications Overview

Model: RS25/A051Y400
Rated Output: 25kW
Voltage: 120/240 Volts 3 Phase
Rated Amps: 75.2
Engine: 2.4L Inline 4-Cylinder
RPM: 1800
Fuel: Natural Gas or Propane
Noise: 69 dBA
Weight: 1109 lbs
Dimensions: 72L x 34W x 43.5H
Warranty: Cummins 2-Year Limited

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Who Should Buy This Generator?

Ideal buyers include:

• Commercial property owners

• Agricultural operations

• Workshops with 3-phase tools

• Small industrial facilities

• Multi-zone HVAC systems

If your application requires dependable three-phase standby power in the 20–29kW range, this unit is engineered for professional use.

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Conclusion

The Cummins 25kW Generator Quiet Connect Series RS25 120/240 Volts 3 Phase delivers industrial-grade reliability in a compact standby solution. With a 1800 RPM liquid-cooled engine, advanced PowerCommand controls, 69 dBA quiet operation, and extreme-weather readiness, it stands out as one of the most dependable 25kW standby generators available.

For facilities requiring efficient three-phase power with proven Cummins engineering, this model offers long-term performance and regulatory compliance. Cummins 25kW Generator Quiet Connect Series RS25 120/240 Volts 3 Phase

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1. What fuel types does the Cummins RS25 support?
It supports Natural Gas and Propane. Fuel type is selectable at installation.

2. Is this generator suitable for commercial use?
Yes. It is UL-2200 listed and compliant with EPA emergency stationary standards.

3. How loud is the generator during operation?
It operates at approximately 69 dBA.

4. Does it support remote monitoring?
Yes. The PowerCommand 1.1 control system supports remote start/stop and diagnostics.

5. Can it operate in extreme cold?
Yes. It is equipped for cold starts down to -40°F with factory-installed heaters.

6. What voltage does it produce?
120/240 Volts 3 Phase at up to 75.2 amps.

7. Is a transfer switch included?
No. A compatible transfer switch must be purchased separately.

8. What warranty is included?
Cummins provides a 2-Year Limited Warranty, with extended options available.