Cummins KTA38-G2B 711kW Generator Drive Engine

The Cummins KTA38-G2B generator-drive engine is a 37.8L, 60-degree V12 diesel engine developed for medium- and high-output generator-set applications at 1,500 rpm and 1,800 rpm.

In the referenced 50 Hz configuration, the engine delivers 711 kW of gross prime mechanical power and 789 kW of gross standby mechanical power at 1,500 rpm. At 1,800 rpm, the referenced prime rating is 830 kW for 60 Hz applications.

Published CCEC performance curves show different 60 Hz standby ratings for different document revisions. Curve FR60193 lists 913 kW at 1,800 rpm, while the earlier FR-6924 curve lists 920 kW. The applicable rating must therefore be confirmed using the performance-curve number, CPL and engine serial number of the quoted unit.

The KTA38-G2B uses a Cummins PT direct-injection fuel system, turbocharging, aftercooling, replaceable wet cylinder liners and a 24V starting system. It can be considered for new OEM generator construction, existing K38 engine replacement and industrial spare-engine programs.

• 37.8L, 60-degree V12 diesel engine
• 50 Hz prime power: 711 kW at 1,500 rpm
• 50 Hz standby power: 789 kW at 1,500 rpm
• 60 Hz prime power: 830 kW at 1,800 rpm
• 60 Hz standby power: 913 or 920 kW depending on the approved performance curve
• Cummins PT direct-injection fuel system
• Turbocharged and aftercooled
• Replaceable wet cylinder liners
• 24V electric starting system
• Configuration reference: D233020DX02
• Published CPL reference: 3660
• Performance-curve references include FR60193 and FR-6924

Planning a new generator set or replacing an existing K38 engine? Send the engine dataplate, ESN, CPL, performance-curve number, required kVA, frequency, alternator model and installation photos for configuration checking.

KTA38-G2B Engine Power and Expected Genset Positioning

The published KTA38-G2B ratings are gross mechanical outputs measured at the engine. They are not the guaranteed electrical output of the complete generator set.

The final generator-set rating must account for:

• Cooling-fan and other driven-equipment losses
• Main alternator conversion efficiency
• Generator-set power factor
• Ambient-temperature and altitude derating
• Enclosure airflow and exhaust restriction
• Auxiliary loads and controller configuration

For many 50 Hz projects, the KTA38-G2B is evaluated for approximately 800–850 kVA prime generator sets and approximately 900–950 kVA standby packages. A 1,000 kVA prime rating should not be claimed from the 711 kW engine figure alone.

Why 711 kW Does Not Automatically Equal 889 kVA

Dividing 711 kW directly by a 0.8 power factor produces 888.75 kVA. This calculation assumes that every kilowatt of mechanical engine power is converted into usable electrical power without fan, auxiliary or alternator losses.

The generator manufacturer should issue the final generator-set rating using the selected alternator, fan absorption, cooling package and site conditions.

50 Hz and 60 Hz Ratings Must Be Treated Separately

A four-pole main alternator normally operates at 1,500 rpm for 50 Hz and 1,800 rpm for 60 Hz. Although the KTA38-G2B has published ratings at both speeds, the engine package should not be converted from one frequency to another simply by changing the governor setting.

Confirm the fuel pump calibration, speed-control hardware, radiator, aftercooler circuit, coupling, main alternator and protection settings for the required operating frequency.

Performance-Curve Revision Control

The KTA38-G2B has been supplied under more than one documented performance-curve revision. This explains why suppliers may publish different 60 Hz standby ratings, CPL references or fuel-consumption values.

Do not combine the prime rating from one curve, standby rating from another curve and fuel-consumption data from a third supplier page. The quotation should identify the curve number applicable to the actual engine.

Prime and Standby Duty Are Not Interchangeable

For isolated grids, continuous industrial production, mining power stations and utility-parallel operation, confirm whether the project requires a continuous, prime or limited-time rating before selecting the engine.

Cummins PT Fuel System and Speed Control

The KTA38-G2B uses the Cummins PT pressure-time fuel system. Fuel delivery is controlled through pump pressure, injector metering and the applicable speed-control configuration.

The model name alone does not prove whether the supplied engine uses a mechanical governor, an electronic fuel-control system or an external actuator installed by the generator-set manufacturer.

Do not promise a specific frequency regulation, one-step load acceptance or parallel-operation capability until the governor, controller, alternator inertia and commissioning requirements are confirmed.

KTA38-G2B Fuel-Consumption Reference

The CCEC performance curve provides fuel consumption in kilograms per hour. The litres-per-hour values below are approximate conversions using a reference diesel density of 0.85 kg/L.

50 Hz Fuel Consumption at 1,500 rpm

60 Hz Fuel Consumption at 1,800 rpm

Actual site consumption varies with fuel density, generator efficiency, fan power, load factor, idle time, altitude, temperature and engine condition. Use the applicable performance curve when sizing the daily fuel tank or calculating guaranteed operating cost.

KTA38-G2B Technical Specifications

Core Engine Data

Weight and Installation References

Do not use generic website dimensions for final base-frame fabrication, enclosure design or freight booking. Request the arrangement drawing for the exact quoted configuration.

Cooling and Lubrication Data

The radiator, heat exchanger and aftercooler circuits must be sized using the heat-rejection and coolant-flow figures for the selected speed and duty. Engine-only coolant capacity is not the total coolant volume of the finished generator set.

Ambient Temperature and Altitude Derating

Some published KTA38-G2B performance documentation states that the referenced engine curve can operate at up to 40°C ambient temperature and 1,500 metres altitude without power derating.

This statement applies only to the conditions and configuration defined by that performance curve. It should not be treated as a universal guarantee for every radiator, enclosure, exhaust system or locally assembled generator set.

For the final project, confirm:

• Maximum ambient temperature
• Site altitude and barometric pressure
• Radiator ambient rating
• Enclosure air inlet and discharge restriction
• Exhaust back pressure
• Fuel temperature and fuel grade
• Alternator temperature-rise class

Emission and Destination-Market Verification

The KTA38-G2B should not automatically be described as Euro II, EPA Tier II or compliant with another emission standard solely from the engine model.

Older export documentation, supplier catalogues and local generator-set approvals may use different emission descriptions. The actual compliance status depends on the engine family, production build, certificate, serial-number coverage and intended application.

When the KTA38-G2B May Be an Appropriate Choice

Replacement Compatibility Checklist

Sharing the same K38 cylinder block does not make different KT38 or KTA38 models direct replacements. Power rating, CPL, fuel calibration, cooling arrangement, flywheel, mounting and control hardware may differ.

Do not order a replacement engine solely from the KTA38-G2B model name. Provide the original dataplate, ESN, CPL, performance curve, genset model and installation photographs.

Generator-Set Application Scenarios

Transient Performance Depends on the Complete Generator Set

The engine model and rated torque do not independently guarantee a specific load-acceptance percentage, frequency dip, voltage dip or recovery time.

Complete-system performance depends on:

• Engine power curve and torque response
• Governor or engine-control configuration
• Main alternator rotating inertia
• Excitation system and AVR
• Generator controller settings
• Load type and load-step size
• Motor-starting method
• Fan and auxiliary power consumption
• Ambient temperature and altitude
• Commissioning and protection settings

ISO 8528, NFPA 110, data-centre classifications and other project standards apply to the completed generator system and installation, not to the engine model alone.

KTA38-G2B Parts and Overhaul Support

ZEB Power can supply Cummins K38 engine parts for routine maintenance, PT fuel-system service, cooling-system repair and engine overhaul.

Parts described as genuine, OEM-equivalent or aftermarket should be clearly identified in the quotation. Critical PT fuel-system and rotating components should not be ordered without ESN, CPL and part-number verification.

Maintenance Planning

Service intervals should follow the operation and maintenance documentation for the actual ESN, CPL, oil specification, fuel quality, load factor and operating environment.

Available Supply Formats

Commercial, Packing and Export Information

Stock, factory origin, price, lead time, included accessories, documents and warranty must be confirmed in the formal quotation. General website statements do not replace the final sales agreement.

Frequently Asked Questions

What is the KTA38-G2B prime power at 50 Hz?

The referenced gross prime mechanical rating is 711 kW at 1,500 rpm. This is engine mechanical power and not the final electrical output of the generator set.

What generator-set size can it support at 50 Hz?

Using a preliminary alternator-efficiency range of 93–96% and a 0.8 power factor, the 711 kW prime engine rating corresponds to approximately 826–853 kVA before site and package derating. Many practical OEM packages may therefore be rated around 800–850 kVA prime.

Is it a 1,000 kVA prime engine at 50 Hz?

Not based on the 711 kW rating alone. A 1,000 kVA generator at 0.8 power factor requires approximately 800 kWe before considering alternator and fan losses, which normally exceeds the available 50 Hz prime output of this engine.

What is the 60 Hz standby rating?

It depends on the performance-curve revision. FR60193 lists 913 kW at 1,800 rpm, while FR-6924 lists 920 kW. Confirm the curve number supplied with the quoted engine.

Why do suppliers publish different KTA38-G2B specifications?

The model has been documented under different performance curves and production revisions. Errors also occur when mechanical kW, electrical kW, kVA, gross output, standby output and fuel-consumption units are mixed.

What is the fuel consumption at 50 Hz prime load?

The referenced curve lists approximately 142 kg/h at 711 kW prime load. Using a diesel-density assumption of 0.85 kg/L, this is approximately 167 L/h.

What is the fuel consumption at 60 Hz standby load?

The FR60193 curve lists approximately 191 kg/h at its 913 kW standby point. This converts to approximately 225 L/h using a diesel density of 0.85 kg/L.

Is the KTA38-G2B mechanically governed?

The actual speed-control arrangement must be confirmed from the ESN, CPL, fuel-pump hardware and generator-set controls. Do not assume that every KTA38-G2B uses the same mechanical or electronic governor configuration.

Does it comply with Euro II or EPA Tier II?

Compliance should not be assumed from the model name. Request the actual emission statement or certificate covering the quoted engine serial number and confirm acceptance in the destination market.

Can it directly replace a KTA38-G1, G2 or G2A?

Not automatically. The models may share the same general block architecture, but their CPL, power curve, pump calibration, turbochargers, cooling, flywheel, mounts and control arrangements may differ.

What is the engine weight?

The referenced fan-hub-to-flywheel engine has a dry weight of approximately 3,719 kg and a wet weight of approximately 3,946 kg. Radiator, frame, filters, exhaust components and export packaging increase the final weight.

What alternator can be matched with the engine?

It can be integrated with a suitable industrial alternator after confirming the required kVA, efficiency curve, voltage, frequency, SAE interface, coupling, excitation system and transient requirements. Do not select an alternator from brand or frame name alone.

Can it operate at 40°C and 1,500 metres without derating?

Some historic performance documentation provides this reference for a defined engine curve. The completed generator set still requires confirmation of radiator ambient rating, enclosure airflow, alternator derating and exhaust restriction.

What information is required for a parts quotation?

Provide the ESN, CPL, current part number where available, component description, photographs and required quantity.

What information is required for a replacement-engine quotation?

Provide the original dataplate, ESN, CPL, performance-curve number, configuration number, genset model, frequency, alternator model, controller details, cooling arrangement and installation photographs.

Request a KTA38-G2B Configuration and Genset-Matching Check

To prepare an accurate quotation, the engine must be matched to the required electrical output and the existing mechanical, cooling, fuel and control interfaces.

Please provide:

• Required prime and standby generator-set output
• 50 Hz or 60 Hz operating frequency
• Voltage, phase and power factor
• Main alternator brand and model
• Original engine model and dataplate photograph
• Engine serial number
• CPL
• Performance-curve number
• Configuration number
• Governor or control-system information
• Flywheel housing and coupling details
• Engine-mount and base-frame drawings
• Radiator and aftercooler configuration
• Controller and protection-system information
• Site altitude and maximum ambient temperature
• Emission and certification requirements
• Required supply format
• Quantity and destination port

Contact ZEB Power for KTA38-G2B curve verification, 50 Hz or 60 Hz genset matching, replacement compatibility, parts support, pricing and export delivery.