Suitable for Cummins Generator Radiators Manufacturers

Cummins Generator Radiators: Full Series Coverage

We manufacture and supply precision-engineered radiators for all major Cummins genset engine series — from compact B Series units to megawatt-class QSK platforms. Each radiator is designed to match the specific heat rejection profile, coolant circuit configuration, and installation requirements of the target engine model. Below is a series-by-series overview to help you identify the right cooling solution.

B Series & C Series — 17 to 275 kVA

The B Series (4BT, 4BTA, 6BTA, 6BTAA) and C Series (6CTA, 6CTAA) are among the most widely deployed Cummins engines in commercial gensets. B Series radiators typically use engine-mounted, belt-driven fan configurations with aluminum or copper-brass cores. C Series engines introduce turbocharged aftercooling, requiring radiators with integrated charge air cooler (CAC) sections or a separate aftercooler core.

Key selection factors for this range include fan diameter compatibility, top-tank and bottom-tank connection size, and whether the installation is open-skid or canopy-enclosed. Motor-driven (remote) variants are available for indoor or container deployments where airflow routing must be separated from the engine bay.

Covered models: 4BT3.9-G2, 4BTA, 4BTA3.9-G13, 6BTA, 6BTAA, 6CTA, 6CTAA, 6CTAA8.3-G9, and motor-drive variants.

F Series & Z Series — Compact & Modular Platforms

The F Series (F2.8) is designed for light-duty and rental genset applications where compact footprint and rapid deployment are priorities. Its radiator package is dimensionally constrained, making precise core sizing and shroud fit critical to avoid recirculation losses.

The Z Series (6ZTAA13) engines power 400–550 kVA gensets and feature higher heat rejection loads that demand larger-format radiator cores with extended fin depth. Both fan-driven and motor-driven configurations are available. The 6ZTAA13-G4-D motor-drive radiator, for example, features a 1575×1286×1135mm envelope and 152 m² heat dissipation area.

Covered models: F2.8-G3, 6ZTAA13-G3, 6ZTAA13-G4, 6ZTAA13-G4-D.

L Series — 6LTAA9.5 (275–400 kVA)

The 6LTAA9.5 engine series features a turbocharged and aftercooled configuration that produces a dual-circuit cooling demand: jacket water cooling and a separate low-temperature charge air circuit. Radiators for this series must deliver sufficient core area for both circuits without exceeding mounting envelope constraints.

The 6LTAA9.5-G1 fan-driven radiator reaches a heat dissipation area of 74.9 m², while the motor-driven version extends this to 93.3 m² — suitable for high-ambient or altitude-derated installations.

Covered models: 6LTAA, 6LTAA9.5-G1, 6LTAA9.5-G1-D.

N Series — NTA855 & NTAA855 (350–500 kVA)

The N Series (NTA855, NTAA855) engines are proven long-stroke workhorses with substantial coolant flow volumes. Their radiators are characterized by large fan diameters (Φ850–Φ950mm) and high water capacity (30–65 L), essential for stable thermal regulation under continuous prime power duty.

For applications requiring remote installation — such as containerized gensets or generator rooms — motor-driven horizontal water-tank configurations (WS-type) are available, allowing the radiator to be positioned up to tens of meters from the engine. Pipe sizing and static head must be carefully calculated to remain within the engine's coolant pump pressure capability.

Covered models: N855-DM, NTA855-G1/G1A/G2A/G4/P500, NTAA855-G7/G7A/G7A-D.

KTA19 Series — 400–700 kVA

The KTA19 and KTAA19 engines are high-output turbocharged aftercooled units with significant intercooler heat loads requiring dedicated management. Fan-driven radiators in this series use fan diameters up to Φ1150mm and achieve heat dissipation areas ranging from 57.3 m² (KTA19-G4) to 212.4 m² (KTAA19-G5), depending on the variant.

For prime power pump applications (KTA19-P600 to P840), remote-type and horizontal water-tank radiator assemblies provide installation flexibility while maintaining full thermal capacity. Heat exchanger (shell-and-tube) options are also available for closed-loop cooling systems.

Covered models: KTA19-G4/G8/P750/P840, KTAA19-G5/G7/G7-8/P818, plus WS and HBJ remote-type variants.

KTA38 Series — 800–1400 kVA

The KTA38 series represents one of Cummins' most demanding thermal challenges in the sub-megawatt range. Total heat rejection at full load can approach 800–1000 kW, requiring radiator assemblies with fan diameters up to Φ1556mm and heat dissipation areas reaching 233.9 m² (KTA38-G9).

Both fan-driven and motor-driven configurations are stocked. For data centers, mining sites, and oil & gas facilities where gensets are installed indoors, remote horizontal water-tank radiators (WS-type) and plate-type heat exchangers (HBJ-type) provide the thermal capacity needed with flexible remote siting — up to multi-meter separation from the engine.

Covered models: KTA38-G(G2)/G2A/G5/G9, KTAA38-G9A, plus WS and HBJ remote and heat-exchanger variants.

QSK Series — 1000 kW to 4500 kW

The QSK platform (QSK19, QSK23, QSK50, QSK60) powers mission-critical, high-capacity gensets in hospitals, data centers, mining plants, and offshore platforms. At this scale, total heat rejection can exceed 2–4 MW per unit, making cooling system design a project-level engineering exercise.

Radiators for QSK engines are the largest in our Cummins portfolio. The QSK60-G8-P radiator, for example, features a 2714×2619×1205mm envelope, 315.5 L water capacity, and 570.7 m² heat dissipation area — making it one of the most thermally intensive single-unit radiators in generator set applications. Four-motor drive configurations are available for maximum airflow and reliability redundancy.

Covered models: QSK19-G4/G11, QSK23-G3, QSK50-G17, QSK60-G4-P/G8-P/G23-P, QST30-G4, K50N-G10.

QSB / QSL / QSX / QSZ Series — QS Platform (30–900 kVA)

The QS (Quantum System) platform covers a wide power spectrum through electronically governed, emissions-compliant engines. Their integrated fuel and thermal management systems often result in higher charge air temperatures and more precise coolant temperature requirements compared to mechanical predecessors.

• QSB7-G5: Fan diameter Φ900mm, 73 m² heat dissipation area — suitable for 200 kVA class gensets.
• QSL8.9-G4 / QSL9-G7: Mid-range L9 platform; both fan-driven and motor-driven options with 78.8–88.7 m² dissipation area.
• QSX15-G8: High-output X15 platform; 115.3 m² dissipation area, fan diameter Φ1155mm.
• QSZ13-G2/G3/G7/G310: Z13 platform covering 450–600 kVA; heat dissipation area 106.5–129.5 m².

All QS-series radiators are designed with core fin specifications optimized for the engine's certified coolant temperature limits, ensuring compliance is maintained without derating under rated ambient conditions.

VTA Series — V-Configuration High-Output (500–1200 kVA)

The VTA28 engine's V-block architecture creates specific coolant distribution requirements. Radiators must deliver symmetrical flow across both cylinder banks to prevent thermal imbalance. The VTA28-G5 and VTA28-G6 radiators feature fan diameters of Φ1260–Φ1460mm and heat dissipation areas of 175.3 m², with deep cores to handle the combined jacket water and oil cooler heat loads characteristic of large V-engines.

Covered models: VTA28-G5, VTA28-G6.

MTA Series — Marine Cooling Solutions

Marine gensets based on MTA (Marine Turbocharged Aftercooled) engines operate in environments where traditional air-cooled radiators are impractical. Our MTA radiators are designed as jacket water heat exchangers cooled by seawater or raw water circuits. Material options include cupronickel tube bundles for saltwater resistance and titanium elements for aggressive offshore environments.

Correct seawater flow rate and strainer sizing are essential to maintain clean heat transfer surfaces. All MTA heat exchanger designs comply with the thermostatic valve requirements needed to prevent wet stacking and condensation during low-load operation.

Covered models: MTAII-G2A, MTAAII-G3.

QSNT Series — Natural Gas & Bi-Fuel Platforms

Gas-fueled Cummins gensets on the QSNT platform exhibit a different combustion thermal profile compared to diesel counterparts, typically running at higher charge air temperatures. QSNT radiators incorporate low-temperature aftercooling sections to suppress knock while maintaining power output across varying fuel compositions.

The QSNT-G3 and QSNT-G4X units cover fan diameters up to Φ945mm with heat dissipation areas of 69.5–139.8 m². Remote plate-type heat exchanger (HGPBJ) variants are available for installations where the radiator must be decoupled from the genset enclosure.

Covered models: QSNT-G3, QSNT-G4X, QSNT-G3 HGPBJ remote type.

How to Select the Right Cummins Radiator

To confirm the correct radiator specification for your project, the following information is required:

1. Engine model and genset model number (e.g., KTA19-G8, QSX15-G8) — this determines core heat rejection data and connection dimensions.
2. Installation type — open skid, canopy-enclosed, containerized, or remote siting — determines whether a fan-driven or motor-driven configuration applies.
3. Site ambient temperature and altitude — both factors affect radiator capacity and may require derating compensation through larger core area or additional fan power.
4. Duty cycle — prime power, continuous, emergency standby — impacts the thermal margin required in the design.
5. Special environment requirements — coastal/saltwater exposure, desert high-temperature, or offshore marine — determines material and surface treatment specifications.

Our engineering team can cross-reference your engine model against our full production database and recommend the optimal radiator configuration. Custom dimensions, non-standard connections, and OEM replacement requirements are all within our standard service scope.