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

The Cummins RS125 Quiet Connect 125kW Generator 277/480 Volts 3 Phase is engineered for reliable standby power in demanding commercial and light industrial environments. Designed for facilities that require consistent three-phase output, this generator combines proven Cummins engine technology with advanced electronic controls and a sound-attenuated aluminum enclosure.

Whether you operate a commercial building, agricultural facility, medical center, or manufacturing site, this 125kW standby generator provides stable voltage, precise frequency control, and dependable performance in extreme climates.

Built in the USA and tested under rigorous load conditions, the RS125 meets EPA emissions standards, is UL-2200 listed, and can achieve NFPA 110 compliance when properly installed with approved accessories.

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Engineered for Commercial-Grade Performance

At the heart of this system is an 8.9-liter turbocharged and aftercooled inline 6-cylinder Cummins engine. The cast-iron block design enhances durability and heat resistance under continuous standby operation.

Key engine specifications:

• 8.9L inline 6 turbocharged engine

• Liquid-cooled system

• 1800 RPM operating speed

• 12-volt negative ground starting system

• 850-amp cold cranking capability (down to 0°F)

• Spin-on oil filter with relief valve

This configuration ensures fast startup, stable load acceptance, and long engine life under heavy demand.

If you require a slightly different voltage configuration, compare this model to the
Cummins RS125 Quiet Connect 125kW Generator 120/208 Volts 3 Phase
or the
Cummins RS125 Quiet Connect 125kW Generator 120/240 Volts 3 Phase.

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277/480 Volt 3 Phase Output for Demanding Applications

The 277/480V 3-phase configuration is widely used in:

• Commercial office buildings

• Data centers

• Manufacturing facilities

• Warehouses

• Hospitals and healthcare systems

• Agricultural operations

Rated at 125kW with 187.9 amps, this system provides stable output supported by:

• Automatic voltage regulation to ±1%

• Frequency regulation to ±0.25% at 60 Hz

• Brushless 4-pole alternator

• 12-lead configuration

This level of regulation protects sensitive equipment and reduces electrical fluctuations during load transitions.

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Quiet Connect Sound-Attenuated Enclosure

Noise control is critical in commercial installations. The RS125 features a Sound Level 1 aluminum enclosure with powder coat finish.

Performance features include:

• 75 dBA operating sound level

• Wind load resistance up to 180 MPH (ASCE 7-10 compliant)

• Corrosion-resistant aluminum housing

• Hinged access doors for simplified maintenance

The enclosure is built to withstand harsh outdoor environments while maintaining a professional appearance.

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PowerCommand 2.3 Electronic Control System

The RS125 uses Cummins’ PowerCommand 2.3 control platform, a commercial-grade control system designed for automatic operation and advanced monitoring.

Capabilities include:

• Automatic start and stop

• Fault detection and auto shutdown

• Output metering

• NFPA 110 Level 1 capability

• Programmable exercise mode

Voltage is regulated within ±1%, while frequency stability remains within 0.25% at 60 Hz. This precision is essential for mission-critical operations.

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Flexible Exercise Mode

Routine exercise is necessary to maintain generator readiness. The flexible exercise mode allows:

• Custom schedule programming

• Minimal run times (as low as 2 minutes)

• Biannual exercise options

• Automatic self-testing

This reduces fuel consumption and wear while ensuring operational reliability.

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Fuel Flexibility: Natural Gas or LP Propane

The Cummins RS125 Quiet Connect 125kW Generator 277/480 Volts 3 Phase supports both natural gas and LP propane. Fuel type is selectable in the field.

Fuel performance:

Natural Gas

• 125kW capacity

• 1665.6 cubic feet/hour (full load)

• 981.3 cubic feet/hour (half load)

LP Propane

• 125kW capacity

• 18.52 gallons/hour (full load)

• 10.54 gallons/hour (half load)

Natural gas is ideal for permanent commercial installations. Propane offers flexibility where gas infrastructure is limited.

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Built for Extreme Conditions

This generator is engineered to start and operate in temperatures as low as -40°F when properly configured.

Additional durability features:

• Liquid cooling system

• Heavy-duty cast iron block

• Seismic compliance capability (IBC)

• EPA emissions compliance

These characteristics make the RS125 suitable for northern climates and severe weather regions.

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Installation Requirements

For proper installation:

1. Prepare a reinforced concrete slab foundation

2. Install a compatible automatic transfer switch

3. Ensure correct gas pressure and supply line sizing

4. Follow NFPA and local electrical codes

5. Schedule professional commissioning

A 250-amp mainline breaker is included. Always verify load calculations before installation.

If your facility requires higher output, consider the
Cummins RS100 Quiet Connect 100kW Generator 277/480 Volts 3 Phase
for smaller applications or other RS Series configurations.

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Real-World Application Example

In a mid-sized manufacturing facility operating CNC equipment, voltage dips can cause system resets and production loss. Installing a 125kW 3-phase standby generator ensures:

• Seamless transfer during outages

• Voltage stability within ±1%

• Reduced downtime

• Equipment protection

In real deployments, facilities report minimal interruption and stable power delivery during grid failures.

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Warranty and Support

Cummins provides:

• 2-Year base consumer warranty

• 2-Year commercial warranty

• Optional extended coverage

This reflects confidence in engineering and manufacturing standards.

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Why Choose This Model?

The Cummins RS125 Quiet Connect 125kW Generator 277/480 Volts 3 Phase stands out for:

• Commercial-grade engine reliability

• Advanced electronic controls

• Tight voltage and frequency regulation

• Dual-fuel capability

• Extreme weather operation

• Heavy-duty sound enclosure

It is built for serious standby power applications where performance and reliability cannot be compromised.

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Conclusion

For facilities that require dependable three-phase standby power, the Cummins RS125 Quiet Connect 125kW Generator 277/480 Volts 3 Phase delivers proven performance, advanced control technology, and durable construction. Its 8.9L turbocharged engine, PowerCommand 2.3 control system, and sound-attenuated aluminum enclosure make it a strong choice for commercial and industrial installations demanding stability and long-term reliability.

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1. What voltage does the Cummins RS125 Quiet Connect 125kW Generator provide?
It delivers 277/480 volts in a 3-phase configuration.

2. Is this generator suitable for commercial use?
Yes. It is designed for commercial and light industrial standby applications.

3. What fuel types are supported?
Natural gas and LP propane.

4. How loud is the generator during operation?
Approximately 75 dBA under normal operating conditions.

5. Can it operate in cold climates?
Yes, it can start in temperatures as low as -40°F with proper configuration.

6. What control system does it use?
Cummins PowerCommand 2.3 electronic control.

7. Does it include automatic startup?
Yes, it features automatic start and stop capability.

8. What warranty is included?
A 2-year base warranty for both consumer and commercial use, with extended options available.