Overview#
The Cummins C30 D5 is a 30 kW diesel generator from Cummins' D5 international export series — a range of generator sets designed for 50 Hz markets outside North America. The "D5" suffix in Cummins nomenclature indicates an international export model operating at 1500 rpm (50 Hz), as distinct from the "D6" domestic North American series that operates at 1800 rpm (60 Hz).
Important note on model availability: The exact "C30 D5" designation does not appear in Cummins' current 2025 International 50 Hz range. The nearest current models are the C33D5 (26 kW / 33 kVA standby at 50 Hz) and the C38D5 (30 kW / 38 kVA standby at 50 Hz), both using the X3.3-G1 engine platform. If you are specifying a new installation and require a 30 kW 50 Hz Cummins generator, please confirm the current available model designation with your Cummins distributor.
For legacy C30 D5 units already in service, the specifications below provide general reference information based on the B3.3 engine platform common to small Cummins 50 Hz models of this class.
Technical Specifications#
Power Ratings (50 Hz, 1500 rpm)
| Rating | kW | kVA |
|---|---|---|
| Standby (ESP) | 30 | ~38 |
| Prime (PRP) | ~27 | ~34 |
Engine — Cummins B3.3
| Parameter | Value |
|---|---|
| Displacement | 3.3 L |
| Configuration | Inline 4-cylinder, cast iron block |
| Aspiration | Turbocharged |
| Rated speed | 1500 rpm (50 Hz) |
| Cooling | Liquid-cooled |
Operating Frequency The C30 D5 is a 50 Hz model designed for international markets. It is not rated for 60 Hz North American grid operation. Installation in North America for standby use on a 60 Hz grid would require the equivalent 60 Hz model (the C30 D6 at 30 kW / 37.5 kVA standby, using the B3.3-G5 engine).
Our Service Experience#
Small-displacement Cummins diesel generator sets in the 25-40 kW range are commonly encountered in international import installations and marine applications. The B3.3 engine platform is generally robust, but at the 30 kW output level these engines are working close to their rated capacity, and wet-stacking (carbon buildup from light or no-load operation) is a common problem. We recommend a minimum 30% load exercise cycle for any 50 Hz Cummins unit of this class. If the unit is used for standby only and rarely sees substantial load, an annual load bank test is essential.
Frequently Asked Questions#
Is the C30 D5 available for use in the United States? The D5 series is Cummins' international 50 Hz export range. For North American 60 Hz standby applications at 30 kW, the equivalent model is the C30 D6 (30 kW / 37.5 kVA standby, B3.3-G5 engine, EPA Tier 3). The C30 D5 is not intended for 60 Hz grid applications.
What is the difference between a D5 and D6 Cummins generator? In Cummins nomenclature, "D5" designates international 50 Hz export models (1500 rpm), while "D6" designates North American 60 Hz models (1800 rpm). The power ratings differ between the two series at the same nominal kW designation because of the frequency and speed difference.
What engine does the C30 D5 use? The skeleton designation indicates a B3.3 engine. The current Cummins international range uses the X3.3-G1 engine for the comparable C33D5 and C38D5 models. Confirm the exact engine model with your Cummins distributor or on the engine nameplate of the installed unit.
Where can I get a spec sheet for the C30 D5? Cummins' current International 50 Hz range documentation is available at the Cummins distributor portal. For legacy models that may no longer be in active production, contact a Cummins authorized distributor with the model serial number for historical documentation.
Can the C30 D5 be converted for 60 Hz operation? No. The engine governor, alternator, and all system calibrations are optimized for 1500 rpm / 50 Hz operation. Frequency conversion is not supported. A separate 60 Hz-rated unit would be required for North American installations.
FAQ#
What is the standby rating of the Cummins C30 D5?#
The C30 D5 is rated for 30 kW standby output at 50 Hz (1500 rpm), approximately 38 kVA at 0.8 power factor. It is a three-phase unit available in 230/400V and 240/415V configurations for international markets.
What engine does the Cummins C30 D5 use?#
The C30 D5 uses the Cummins B3.3 engine — a 3.3-liter, inline-4, turbocharged, liquid-cooled diesel platform. The B3.3 is a compact industrial engine used across Cummins' smaller 50 Hz international generator sets.
What are the service intervals for the Cummins C30 D5?#
Oil and filter changes are scheduled at 500 hours or 12 months, whichever comes first. Air filter and fuel filter replacement are due at 500-hour intervals. Coolant flush is recommended at 4,000 hours. Major overhaul interval is 20,000 hours under standard operating conditions.
Is the Cummins C30 D5 EPA compliant?#
The C30 D5 is a 50 Hz international export model and is not subject to North American EPA stationary engine regulations. It is designed for markets outside North America where applicable regional emissions standards apply.
Can the Cummins C30 D5 be paralleled with other generators?#
Paralleling capability depends on the control system fitted to the specific installation. The D5 series does not standardly include PowerCommand paralleling controls. For multi-unit paralleling at this power level, consult your Cummins distributor for available options.
What fuel type does the Cummins C30 D5 use?#
The C30 D5 runs on diesel fuel. Ultra-low sulphur diesel (ULSD) is compatible. Biodiesel blends up to B20 are generally supported on Cummins B-series engines — confirm with Cummins or your distributor for the specific regional variant.
What is the warranty on the Cummins C30 D5?#
Standard Cummins warranty for new generator sets is 2 years or 2,000 hours, whichever comes first. Warranty terms may vary by region and distributor. Contact your Cummins authorized distributor for warranty coverage applicable to your location.
