Cummins · Cummins Centum Series

Cummins C1250 D6e

1250 kW standby / 1135 kW prime · Diesel · Liquid-cooled

1250 kW Centum Series diesel standby generator with QSK38 engine. PowerCommand 3.3 controller, charged air-cooled intake, smaller footprint, single-source Cummins integration for data center and mission-critical applications.

Cummins Cummins C1250 D6e generator — specifications and details
Standby power
1250 kW / 1135 kW prime
Voltage options
277/480V, 346/600V, 4160V
Frequency / Phase
60 Hz · 3-phase
Engine
Cummins QSK38
EPA / Emissions
Tier 2
Data CentersHealthcareparalleling-arrayCommercial
Configure & QuoteDownload spec sheet

Overview#

The Cummins C1250 D6e is a 1250 kW standby diesel generator set from the Centum Series -- Cummins' premium platform engineered for data center and mission-critical applications. Powered by the QSK38 diesel engine with the PowerCommand 3.3 controller, the Centum platform delivers megawatt-class power in a smaller footprint than traditional D6 gensets, with charged air-cooled intake for improved performance across ambient conditions.

The Centum Series represents Cummins' single-source approach to power generation: engine, alternator, controller, and cooling system are all designed and manufactured by Cummins, eliminating multi-vendor integration complexity. The PowerCommand 3.3 controller provides advanced paralleling, load management, and digital connectivity for building management system integration -- critical requirements for modern data center operations.

At 1250 kW, the C1250 D6e serves as a versatile building block for paralleling arrays in Tier III and Tier IV data centers, large hospitals, and campus microgrids. The reduced footprint compared to traditional gensets allows more power density per square foot of generator yard space. Fuel consumption runs approximately 88 gallons per hour at full rated load.

Engineering specifications

Fuel system & runtime

Fuel use @ full load
88 GPH
Fuel use @ 75% load
66 GPH
Fuel use @ 50% load
46 GPH

Ready to order this model?

Configure your Cummins C1250 D6e

Lock the enclosure, fuel system, transfer switch, and add-ons — we'll confirm pricing, availability, and lead time within one business day. Prefer a free-form quote? That option is still here.

Configure & Quote →Just request a quote

Estimate runtime for the Cummins C1250 D6e

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Estimated runtime

2.9 hours(0.1 days)

Fuel consumption ≈ 67.89 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Cummins C1250 D6e under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter
Every 500 hours or 12 months
Air filter
Every 1000 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 40,000 hours

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

ComponentSymptomTypical hoursSeverity
Fuel injection system (MCRS)Injector fault codes, rough running, power imbalance—moderate
Charged air-cooled intake systemCharge air cooler leaks, reduced boost efficiency, intake temperature rise—moderate
Cooling systemCoolant temperature exceedances, system pressure loss—severe
PowerCommand 3.3 controllerCommunication faults, sensor input errors, firmware update requirements—minor
Starting system (24V battery bank)Slow crank, failed start on infrequently exercised units—minor

Frequently Asked Questions

What is the Cummins Centum Series?
The Centum Series is Cummins' premium generator platform designed for data center and mission-critical applications. It features a smaller footprint than traditional D6 gensets, charged air-cooled intake, the PowerCommand 3.3 controller, and full single-source Cummins integration -- engine, alternator, controls, and cooling from one manufacturer.
What engine does the C1250 D6e use?
The C1250 D6e uses the Cummins QSK38 diesel engine with MCRS fuel injection. The QSK38 also serves the C1250 D6 and C1500 D6e Centum models, with different calibrations for each power rating.
What are the standby and prime ratings of the C1250 D6e?
Standby rating is 1250 kW (1563 kVA) at 60 Hz, 0.8 power factor. Prime rating is 1135 kW (1419 kVA). Both at 1800 rpm, 60 Hz, three-phase.
How does the Centum C1250 D6e differ from the standard C1250 D6?
The Centum C1250 D6e features a smaller physical footprint, charged air-cooled intake, and the advanced PowerCommand 3.3 controller. The standard C1250 D6 uses the traditional D6 platform design. Both deliver 1250 kW standby from a QSK38 engine, but the Centum is optimized for modern data center requirements.
Can OnPoint Generators service the C1250 D6e in Northern California?
Yes. OnPoint Generators provides authorized Cummins service for Centum Series generators across the San Francisco Bay Area and Northern California. The Centum platform uses standard Cummins engines and components, so our factory-trained technicians service them with the same INSITE diagnostics used on all Cummins power generation equipment.

Compatible equipment

Transfer switches

Similar models

Cummins Cummins C1250 D6 1.3 MW liquid-cooled standby generator

Cummins

Cummins C1250 D6

1250 kW diesel with QSK38 V-12 engine at full rated output. MCRS fuel injection. Full Cummins vertical integration. Paralleling for multi-MW.

1.3 MW standby · Diesel · Liquid-cooled

1250 kW diesel standby generator with QSK38 37.7L V-12 engine and MCRS fuel injection. EPA Tier 2 compliant, PowerCommand control, 2P2L cooling, for data center, hospital, and mission-critical standby applications.

Tier 23-phasedata-centerhospital
Cummins Cummins C1500 D6e 1.5 MW liquid-cooled standby generator

Cummins

Cummins C1500 D6e

1.5 MW Centum Series with QSK38 at peak output. Smaller footprint, PowerCommand 3.3, charged air-cooled intake. Single-source Cummins platform.

1.5 MW standby · Diesel · Liquid-cooled

1500 kW Centum Series diesel standby generator with QSK38 engine. PowerCommand 3.3 controller, charged air-cooled intake, smaller footprint, single-source Cummins integration for data center and mission-critical applications.

Tier 23-phasedata-centerhospital
Cummins Cummins C1100 D6 1.1 MW liquid-cooled standby generator

Cummins

Cummins C1100 D6

1100 kW diesel with QSK38 V-12 engine. MCRS fuel injection. Full Cummins vertical integration. Paralleling for multi-MW.

1.1 MW standby · Diesel · Liquid-cooled

1100 kW diesel standby generator with QSK38 37.7L V-12 engine and MCRS fuel injection. EPA Tier 2 compliant, PowerCommand control, liquid-cooled, for data center, hospital, and mission-critical standby applications.

Tier 23-phasedata-centerhospital

Need service or parts for the Cummins C1250 D6e?

We service every major OEM and stock genuine parts for the most common models.

Get A QuoteOr call (831) 375-1463