Cummins · Cummins D6 Commercial Diesel

Cummins C3250 D6

3250 kW standby / 2960 kW prime · Diesel · Liquid-cooled

3250 kW diesel standby generator with QSK95-G2 95L V-16 engine. PowerCommand control, liquid-cooled, for hyperscale data center and mission-critical standby applications.

Cummins Cummins C3250 D6 generator — specifications and details
Standby power
3250 kW / 2960 kW prime
Voltage options
277/480V, 346/600V, 4160V, 12470V, 13800V
Frequency / Phase
60 Hz · 3-phase
Engine
Cummins QSK95-G2 · 95L
EPA / Emissions
Tier 2
Data CentersManufacturingparalleling-arrayutility
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Overview#

The Cummins C3250 D6 is a 3250 kW standby diesel generator set powered by the QSK95-G2 -- a 95-liter, V-16 diesel engine. Rated at 4063 kVA standby and 3700 kVA prime at 60 Hz, the C3250 D6 occupies the mid-range of the QSK95 mega-diesel platform, balancing output with operational headroom.

At 3.25 MW per unit, the C3250 D6 is a building block for hyperscale data center power plants. Four units in a paralleling array deliver 13 MW of standby capacity with N+1 redundancy at the 3-unit load level. The QSK95-G2 platform's 95 liters of displacement ensure the engine runs well within its thermal limits at the 3250 kW calibration.

Full Cummins vertical integration covers engine, alternator, PowerCommand controls, and cooling. Medium-voltage output (4160V, 12470V, 13800V) is standard. Fuel consumption runs approximately 228 gallons per hour at full rated load, with a 40,000-hour major overhaul interval under standard standby duty.

Engineering specifications

Fuel system & runtime

Fuel use @ full load
228 GPH
Fuel use @ 75% load
171 GPH
Fuel use @ 50% load
118 GPH

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Estimate runtime for the Cummins C3250 D6

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

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Estimated runtime

1.1 hours(0.0 days)

Fuel consumption ≈ 175.89 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 C3250 D6 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, cylinder imbalance across V-16 banks—moderate
Turbocharger systemReduced boost pressure, excessive exhaust smoke, turbo bearing wear—moderate
Cooling system (high-capacity radiator)Coolant temperature exceedances, system pressure loss under sustained load—severe
Fuel quality / tank degradationFilter clogging, hard starting, injector fouling from stagnant fuel—moderate
Starting system (24V battery bank)Slow crank on 95L displacement, failed start on infrequently exercised units—minor

Frequently Asked Questions

What engine does the Cummins C3250 D6 use?
The C3250 D6 uses the Cummins QSK95-G2 -- a 95-liter, V-16 diesel engine. This is the same platform as the C3000 D6 and C3500 D6, calibrated for 3250 kW standby output at the mid-range of the QSK95 power band.
What are the standby and prime ratings of the C3250 D6?
Standby rating is 3250 kW (4063 kVA) at 60 Hz, 0.8 power factor. Prime rating is 2960 kW (3700 kVA). Both at 1800 rpm, 60 Hz, three-phase.
What are the service intervals for the C3250 D6?
Oil and filter changes are due at 500 hours or 12 months. Air filter replacement at 1,000-hour intervals. Fuel filter at 500 hours. Coolant flush at 6,000 hours. Major overhaul interval is 40,000 hours under standard standby duty conditions.
How does the C3250 D6 compare to the C3500 D6?
Both use the QSK95-G2 (95L, V-16) engine. The C3500 D6 operates at the top of the QSK95 power band at 3500 kW, while the C3250 D6 runs at a mid-range calibration with more thermal headroom for sustained operation.
Can PowerGen service the C3250 D6 in Northern California?
Yes. PowerGen provides authorized Cummins service for mega-diesel generators across the San Francisco Bay Area and Northern California. The QSK95 V-16 requires specialized tooling and factory-trained technicians. We use Cummins INSITE diagnostics on every service visit.

Compatible equipment

Transfer switches

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