Cummins 4BTA3.9G2 Diesel Generator Set – 66 kVA, Turbocharged, Leroy Somer/Stamford Alternator

ReflowX SKU: REF-7920

Product Details

Quantity

2
Availability (Lead Time)

0-2 Weeks
Product Location

United Arab Emirates
Condition

New
OEM

Perkins
Equipment code

gen-d

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Short Description

Reliable 66 kVA diesel generator powered by Cummins 4BTA3.9G2 turbocharged engine, featuring a self-excited AQT | Leroy Somer or Stamford alternator, ±1% voltage regulation, and IP23 protection – ideal for industrial standby or prime power.

Description

Cummins 4BTA3.9G2 Diesel Generator Set – 66 kVA, Turbocharged, Leroy Somer/Stamford Alternator

The Cummins 4BTA3.9G2 Diesel Generator Set offers compact and efficient power generation for commercial and light industrial operations. Driven by a rugged 4-cylinder Cummins engine, this set utilizes a turbocharged and aftercooled air system for improved combustion and performance, while maintaining low emissions and fuel consumption.

The 3.9-liter engine runs on a 4-stroke cycle with a bore and stroke of 102 mm × 120 mm. A BYC PB electronic governor ensures precise speed regulation, and the fuel system includes spin-on fuel filters and water separators for enhanced reliability and maintenance efficiency. The starting voltage is 12V, supported by a 37A alternator for battery charging, with SAE 3 / 11.5 flywheel configuration for generator coupling.

The alternator is the AQT TAL-042-E, available from Leroy Somer or Stamford, delivering 66 kVA (53 kW) output with 4-pole construction and 2/3 winding pitch. Class H insulation ensures high thermal durability, while self-excitation and the R220 AVR provide stable voltage control within ±1%. The alternator is IP23 protected, with THF < 3.5% and TIF < 50, making it suitable for both general-purpose loads and sensitive equipment. Cooling is facilitated by a 0.25 m³/sec airflow.

Specifications:

– Engine Make: Cummins
– Engine Model: 4BTA3.9G2
– Engine Type: 4-Cylinder, In-line, Diesel
– Aspiration: Turbocharged & Aftercooled
– Cycle: 4 Stroke
– Bore x Stroke: 102 mm × 120 mm
– Displacement: 3.9 Litres
– Governing Type: BYC PB / Electronic Governor
– Flywheel Dimensions: SAE 3 / 11.5
– Battery Charging Alternator: 37 AMP, 12V
– Starting Voltage: 12V
– Fuel System: BYC PB with spin-on fuel filters and water separators
– Fuel Filter: Spin-on with water separator
– Lubrication System: Spin-on lube oil filter
– Lube Oil Capacity: Approx. 10–12 litres (see engine manual)

– Alternator Make: AQT | Leroy Somer / Stamford
– Alternator Model: TAL-042-E
– Output Rating: 66 kVA
– Rated Output: 53 kW
– Number of Poles: 4
– Winding Pitch: 2/3
– Insulation Class: H
– Temperature Rise: 125°C @ 40°C ambient
– Ingress Protection Rating: IP23
– Excitation System: Self-Excited
– AVR Model: R220
– Voltage Regulation: ±1%
– Harmonic Distortion (THF): < 3.5%
– Telephone Influence Factor (TIF): < 50
– Cooling Air Flow: 0.25 m³/sec
For further specifications or to inquire about this equipment and ReflowX's logistics services, Please contact ReflowX at info@reflowx.com

Technical Details

Model Number	CUMMINS 4BTA3.9G2
Model Number	CUMMINS 4BTA3.9G2
Height	1250 mm
Width	850 mm
Length	2100 mm
Weight	Approx. 1200 kg
Usage Hours	00
Voltage	400V
ISO 15926 Pt 4	2353
PCA RDS Code	RDS873359
CFIHOS ID	CFIHOS-30000804
Output Power	54 kVA / 43.2 kW
Speed	1500 RPM
Direction of Rotation	Clockwise
IFC Class	IfcElectricGenerator
Explosion Protection Temperature Class	T3 or T4
Explosion Protection Zone	Zone 2
Lower Limit Operating Temperature	–10°C (standard), –25°C with optional cold weather kit
Operation Continuous Intermittent	Continuous (Prime) / Intermittent (Standby)
Upper Limit Operating Temperature	+50°C (derating applies above 40°C)

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