Cummins Diesel Generator Set 4BTA3.9-G2 with UCI 224D 50kw 63kva Prime Power Diesel Generator Set

50kW / 63kVA Prime Power Cummins Diesel Generator Set

Original Cummins 4BTA3.9-G2 Engine + STAMFORD UCI224D Alternator  |  60Hz · 220V · Three Phase · 1800rpm

1. Cummins Diesel Generator Set Overview

This is a 50 kW / 63 kVA prime power diesel generator set built around an original Cummins 4BTA3.9-G2 diesel engine and a STAMFORD UCI224D brushless alternator. Configured for 60 Hz, 220 V three-phase output at 1800 rpm, this Cummins diesel generator set is designed for reliable continuous (prime) power supply in commercial, industrial and residential applications.

As a factory-direct manufacturer of Cummins diesel generator sets, we supply 50 kW generator sets, 63 kVA generator sets, silent generator sets and larger standby generators with full factory load testing, genuine spare parts support and export packaging. Typical applications of this three phase diesel generator include: factory production lines, construction projects, telecom base stations, hospitals and clinics, hotels and resorts, farms and irrigation systems, water pumping stations, data centers, mining and oil field sites, as well as backup power for offices and homes.

Key Features of This 50kW Diesel Generator Set

• Original Cummins engine – genuine DCEC (Dongfeng Cummins Engine Co., Ltd.) 4BTA3.9-G2 power unit, supported by the worldwide Cummins service network and genuine spare parts.
• STAMFORD UCI224D brushless alternator with automatic voltage regulator (AVR) – stable output with approx. ±1% voltage regulation and strong motor-starting capability.
• 60Hz / 220V / three phase / 1800rpm – built exactly to your required electrical configuration.
• Low fuel consumption and low operating cost for continuous prime power duty.
• Compact open-type skid design – easy to install, maintain and relocate on site.
• 100% factory load-tested before delivery, with the load test report provided.
• Full export documents and after-sales technical support for long-term cooperation.
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2. Main Technical Specifications

Note: Standby rating, silent (soundproof) canopy and automatic transfer switch (ATS) are available on request.

3. Cummins Diesel Engine Introduction – 4BTA3.9-G2

The heart of this 50kW Cummins diesel generator set is the original Cummins 4BTA3.9-G2 diesel engine, manufactured by DCEC (Dongfeng Cummins Engine Co., Ltd.), a joint venture of Cummins Inc. and one of Cummins’ major production bases in China. This four-cylinder, in-line, four-stroke, 3.9-litre engine is turbocharged and aftercooled and water-cooled, with a cast iron cylinder block for long service life in continuous-duty generator applications.

It is fitted with a mechanical in-line fuel injection pump and a GAC electronic governor, which keeps the engine speed and output frequency stable even when the load changes. With a rated output of 67 kW at 1800 rpm, the engine provides ample reserve power for 50 kW prime duty, giving excellent transient response and a long, trouble-free service life. The 4BTA3.9-G2 is a proven workhorse in Cummins diesel generator sets worldwide, with low fuel consumption, easy maintenance and genuine spare parts available through the Cummins service network in nearly every country.

Engine Specifications

4. STAMFORD UCI224D Alternator Introduction

The alternator of this 63kVA diesel generator is a STAMFORD UCI224D brushless synchronous alternator from Cummins Generator Technologies, one of the world’s most trusted names in generator manufacturing. The UCI224D is a four-pole, brushless machine with an automatic voltage regulator (AVR), giving steady-state voltage regulation of approx. ±1% and a total harmonic factor (THF) of less than 2% – clean, stable power that is friendly to sensitive electronic equipment.

Built to international standards including BS EN 60034, IEC 34, NEMA MG1-32, VDE 0530 and CSA C22.2-100, the UCI224D offers Class H insulation and IP23 protection, with excellent motor-starting capability and low reactance for reliable performance under sudden load changes. It is matched to the 4BTA3.9-G2 engine to deliver a solid 50 kW / 63 kVA prime output at 60 Hz, and its 12-lead reconnectable winding allows flexible voltage configurations.

Alternator Specifications

5. Production & Assembly Process

Every Cummins diesel generator set from our factory goes through a controlled production and assembly process, with inspection records at each stage. The main steps are as follows:

1. Frame fabrication – the steel base frame is cut, welded, shot-blasted and coated with anti-corrosion paint.
2. Engine and alternator mounting – the Cummins engine and STAMFORD alternator are mounted on the base frame with anti-vibration dampers.
3. Precision coupling alignment – the flexible coupling is aligned with a dial gauge to control concentricity, ensuring smooth running and long bearing life.
4. Auxiliary system installation – radiator and fan guard, cooling pipes, fuel lines, exhaust system, battery and cables are installed.
5. Control panel and electrical wiring – the control panel is mounted, the full wiring harness is laid out and checked against the wiring diagram, and the circuit breaker and protections are set.
6. Lubricant and coolant filling – engine oil, coolant and fuel are filled to specification.
7. 100% load test – the set is run in and load-tested at 25% / 50% / 75% / 100% of rated load. Frequency, voltage, oil pressure, coolant temperature, fuel consumption and vibration are recorded in the load test report.
8. Final inspection & packaging – leak check, appearance check, protective wrapping and export wooden case packing.

Key Quality Control Points

6. Factory Production Equipment & Work Flow

Main Production Equipment

• CNC plate cutting and CNC bending machines for precision base frame fabrication
• Automatic (robot) welding equipment for consistent weld quality
• Shot blasting and automatic painting line for long-lasting anti-corrosion finish
• Overhead cranes and forklifts for safe material handling
• Generator load test bench with resistive load bank for 100% load testing
• Precision instruments: laser alignment tool, thermal imager, vibration meter, insulation tester

Production Work Flow

1. Incoming material inspection – engine, alternator, control panel and components are inspected against the purchase specification and inspection records.
2. Production planning – every order is scheduled and tracked by order number to ensure on-time delivery.
3. Assembly and process QC – process inspection is carried out at each work station; non-conforming parts are rejected and replaced.
4. Final load test – 100% of the diesel generator sets are load-tested before packing, and the test report is archived and provided to the customer.
5. Packaging and shipping – export packing, loading photos and complete shipping documents.

Quality assurance: our factory operates under a strict quality management system in accordance with ISO 9001, and every Cummins diesel generator set is inspected by our QC team before it leaves the workshop.

7. Packaging Details, Dimensions & Container Loading

Export Packaging Details

Dimensions & Container Loading (typical)

Note: the packing can be customized (skid type, silent canopy type or container flat rack). Loading photos will be provided before shipment, and FOB / CIF / EXW trade terms are available.

8. Company Strength

We are a professional manufacturer of diesel generator sets, specializing in Cummins diesel generator sets, silent generator sets and custom power solutions. Our factory is equipped with a complete production line and an experienced technical team. 

• Years of experience in diesel generator manufacturing [confirm years]
• Complete production line from frame fabrication to final load test
• 100% factory load test before delivery, test report provided
• Exported to different countries worldwide 
• Genuine spare parts support and English-speaking sales & after-sales team
• OEM branding and long-term distributor / agent cooperation welcome

9. Frequently Asked Questions (FAQ)

Q1. Is this a genuine Cummins diesel generator set?
Yes. The engine is an original Cummins 4BTA3.9-G2 produced by DCEC (Dongfeng Cummins Engine Co., Ltd.), and the alternator is a genuine STAMFORD UCI224D. We provide the engine number and alternator nameplate details, and genuine spare parts are available through the Cummins service network.

Q2. What is the difference between prime power and standby power?
Prime power is the output a generator can supply continuously with a variable load for unlimited hours. Standby power is for limited emergency use during mains failure. This set is rated 50 kW / 63 kVA at prime power, and a standby rating can be offered if required.

Q3. Can the voltage and frequency be customized?
Yes. We can supply 50 Hz or 60 Hz, and voltages such as 220V / 380V / 400V / 440V, three-phase or single-phase, according to your local standard and application.

Q4. What is your delivery time?
[Around 30working days] depending on stock and configuration.

Q5. What about the warranty and after-sales service?
[ 12 months or 1000 operating hours, whichever comes first]. We provide technical support by email, WhatsApp and video call, and can ship spare parts quickly when needed.

Q6. Do you provide spare parts?
Yes. We can supply a recommended spare parts list together with the machine and keep common wearing parts (filters, belts, etc.) in stock.

Q7. What is the fuel consumption?
The actual load-test fuel data is provided with the machine. As a reference, a 50 kW generator set typically consumes about 13–15 L/h at 100% load [confirm from your test report].

Q8. How is the generator packed and shipped?
It is packed in a fumigated export standard and shipped by sea freight. We take loading photos before shipment and provide complete export documents. FOB, CIF and EXW terms are available.

Q9. Can you make a silent (soundproof) version or add an ATS?
Yes. Silent canopy, trailer mounting, automatic transfer switch (ATS) and remote monitoring are all available as options.

Q10. Do you accept OEM and distributor cooperation?
Yes. We welcome OEM branding and long-term distributor / agent cooperation. Please contact us to discuss the terms.

10. Get a Quote

For pricing, lead time, technical drawings and customization options of this 50kW / 63kVA Cummins diesel generator set, please contact our sales team:

Email:nancy@ztapower.com |  WhatsApp: 0086 13906008114 |  Website: www.ztapower.com

We look forward to supplying you with a reliable Cummins diesel generator set at a factory-direct price.