The Cummins Onan C125 D6D generator is listed with standby output of 125 kW, Diesel fuel, 60 Hz operation, 120/240 V, 120/208 V output, 1-Mar, and rated current of 800 A.
Generator • Diesel • 60 Hz • 1-Mar
Key specifications
Useful generator charts
Charts are shown only when this model has enough usable source data.
38.6 kW
31.8 kW
125 kW
113 kW
How the Cummins Onan C125 D6D compares
This compares the supplied numeric specification with Cummins Onan generators in the same broad standby-power class where enough comparable data exists.
About 34% above the similar-output Cummins Onan average. Around the 82nd percentile for this field.
About 50% above the similar-output Cummins Onan average. Around the 83rd percentile for this field.
About 9% below the similar-output Cummins Onan average. Around the 73rd percentile for this field.
About 20% above the similar-output Cummins Onan average. Around the 79th percentile for this field.
Generator information
| Manufacturer | Cummins Onan |
|---|---|
| Model | C125 D6D |
| Generator type | Generator |
| Fuel | Diesel |
| Frequency | 60 Hz |
Electrical output
| Standby power | 125 kW |
|---|---|
| Prime power | 113 kW |
| Standby kVA | 156.0 |
| Voltage options | 120/240 V, 120/208 V |
| Phase | 1-Mar |
| Rated current | 800 A |
| Circuit breaker | 600 A |
Engine, cooling and controls
| Engine model | Cummins/Onan QSB7 series |
|---|---|
| Engine displacement | 408 cu in (6.69 L) |
| Aspiration / cooling | direct injection |
| Rated engine speed | 1500 rpm |
| Engine oil capacity | 4.99 gal (18.9 L) |
| Oil capacity | 4.99 gal (18.9 L) |
| Controller | 2.3, PowerCommand 1.1 |
| Emissions | EPA Tier 3 |
Physical specifications
| Dry weight | 3, 241 lb (1, 470 kg) |
|---|---|
| Dimensions (L × W × H) | 55.7 × 2.2 × 112.9 in (1415 × 56 × 2867 mm) |
Battery
| Battery cranking | 850 CCA |
|---|---|
| Battery voltage | 12 V |
| Battery quantity | 2 |
Fuel consumption
| Standby | 4.2 gal/h |
|---|---|
| Prime | 9 gal/h |
Maintenance and service parts
| Engine oil | Capacity: 18.9 |
|---|---|
| Oil filter | Interval: 1000 hr |
| Fuel filter | Interval: 500 hr; Specification: Strata pore fuel filter |
| Air filter | Part number: A047M180; Specification: Filter, Air − Normal Duty |
| Coolant | Capacity: 26.95 |
Disclaimer: Specifications should be verified against the official owner’s or service manual and confirmed on the Cummins North America generator website.