ebm-papst A4E350 EC Fan Modules

Technical Dossier

Product Details And Specifications

ebm-papst A4E350 Series: Comprehensive Module Range and Technical Overview

The ebm-papst A4E350 series represents a standardized axial EC fan platform engineered for continuous-duty industrial environments. With a nominal impeller diameter of 350 mm, this series is deployed across heavy-process industries including petrochemical refining, offshore platform HVAC, nuclear auxiliary cooling circuits, pharmaceutical cleanroom air handling, and large-scale data center thermal management. The A4E350 platform operates on electronically commutated (EC) motor technology, eliminating brushes and external commutation electronics, which directly reduces maintenance intervals in facilities where unplanned downtime carries high operational cost. Installed base spans multiple continents, with documented deployments in IEC-regulated facilities across Europe, the Middle East, and Asia-Pacific.

The Evolution of A4E350 Architecture

The A4E350 lineage originates from ebm-papst's transition from AC shaded-pole and external-rotor AC motors toward integrated EC drive platforms in the late 1990s. Early A4E350 variants used analog speed control via 0–10 V DC input signals and featured basic thermal protection (PTC thermistor output only). These units were designed for single-phase 230 V AC mains with no onboard bus communication.

The second-generation architecture introduced PWM speed control compatibility (10–100% duty cycle, 1 kHz carrier), improved EMC filtering to meet EN 55014-1 Class B, and extended the operating temperature range to –20 °C to +60 °C ambient. Motor efficiency was reclassified to IE4 equivalent under the ErP Directive 2009/125/EC.

Current-generation A4E350 units integrate RS-485 MODBUS RTU communication as a factory option, enabling direct integration into building management systems (BMS) and distributed control systems (DCS) without external speed controllers. The EC motor controller is embedded within the motor housing, reducing panel space requirements. Backward mechanical compatibility with the 350 mm mounting frame is maintained across generations, allowing drop-in replacement of legacy AC units in existing duct assemblies.

Compatibility note: Early-generation units with analog-only control are not electrically interchangeable with MODBUS-enabled variants without signal wiring modification. Verify control interface type before ordering a replacement.

A4E350 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the ebm-papst A4E350 platform. Each entry reflects a distinct electrical, mechanical, or control configuration.

A4E350-AQ02-11: 350 mm EC axial fan, 230 V AC 1-ph, PWM speed control, IP44, standard lead wires.
A4E350-AQ02-12: 350 mm EC axial fan, 230 V AC 1-ph, 0–10 V analog control, IP44, terminal box.
A4E350-AQ02-13: 350 mm EC axial fan, 230 V AC 1-ph, fixed speed, IP44, PTC output.
A4E350-AQ06-11: 350 mm EC axial fan, 115/230 V AC universal input, PWM control, IP44.
A4E350-AQ06-12: 350 mm EC axial fan, 115/230 V AC universal input, 0–10 V analog control, IP44.
A4E350-AQ12-11: 350 mm EC axial fan, 200–277 V AC 3-ph, PWM control, IP54, terminal box.
A4E350-AQ12-12: 350 mm EC axial fan, 200–277 V AC 3-ph, 0–10 V analog control, IP54.
A4E350-AQ12-13: 350 mm EC axial fan, 200–277 V AC 3-ph, MODBUS RTU RS-485, IP54.
A4E350-AQ20-11: 350 mm EC axial fan, 380–480 V AC 3-ph, PWM control, IP54, high-static pressure variant.
A4E350-AQ20-12: 350 mm EC axial fan, 380–480 V AC 3-ph, 0–10 V analog control, IP54.
A4E350-AQ20-13: 350 mm EC axial fan, 380–480 V AC 3-ph, MODBUS RTU RS-485, IP54, extended temp.
A4E350-AQ30-11: 350 mm EC axial fan, 24 V DC input, PWM control, IP44, low-voltage panel cooling.
A4E350-AQ30-12: 350 mm EC axial fan, 24 V DC input, 0–10 V analog control, IP44.
A4E350-AQ40-11: 350 mm EC axial fan, 48 V DC input, PWM control, IP44, telecom/data center variant.
A4E350-AQ40-12: 350 mm EC axial fan, 48 V DC input, 0–10 V analog control, IP44.
A4E350-AQ50-11: 350 mm EC axial fan, 230 V AC, reverse airflow configuration, PWM control, IP44.
A4E350-AQ50-12: 350 mm EC axial fan, 230 V AC, reverse airflow, 0–10 V analog control, IP44.
A4E350-AQ60-11: 350 mm EC axial fan, 230 V AC, high-efficiency impeller (η > 55%), PWM, IP54.

Sourcing Hard-to-Find & Obsolete A4E350 Parts

Several early-generation A4E350 variants with analog-only control interfaces have been discontinued by ebm-papst as the product line migrated to integrated EC controllers with digital communication. Facilities operating legacy HVAC or process cooling systems built around these units face a sourcing gap: OEM supply has ended, and direct substitution with current-generation models requires control wiring modification.

DriveKNMS maintains a dedicated inventory of new-old-stock (NOS) and reconditioned A4E350 units sourced through authorized distribution channels and industrial surplus recovery. Each unit in our inventory is cataloged by part number, production date code, and control interface type to ensure accurate cross-referencing against customer BOM requirements.

For facilities requiring long-term maintenance support under ISO 55001 asset management frameworks, DriveKNMS provides multi-year supply agreements covering scheduled replacement cycles. This is particularly relevant for nuclear auxiliary systems and offshore installations where component qualification processes make ad-hoc sourcing impractical.

Customers are advised to provide the full nameplate data (part number, voltage, frequency, speed range, and control type) when submitting sourcing requests to avoid cross-model substitution errors.

Quality Control for the A4E350 Range

EC fan modules in the A4E350 series incorporate integrated motor controllers with embedded firmware. Standard visual inspection and continuity testing are insufficient to validate functional integrity. DriveKNMS applies the following test protocol to all A4E350 units processed through our facility:

Electrical safety test: Hipot (dielectric withstand) at 1,500 V AC for 1 second between live conductors and motor frame, per IEC 60204-1.
Insulation resistance: Megohm test at 500 V DC; minimum acceptance threshold 100 MΩ.
No-load run test: Unit powered at rated voltage for minimum 10 minutes; current draw, vibration signature, and bearing noise recorded.
Speed control verification: PWM and/or 0–10 V analog input swept across full range; output RPM verified against nameplate specification ±5%.
MODBUS communication test (where applicable): Register read/write cycle executed via RS-485 interface; response time and data integrity verified.
Thermal protection test: PTC thermistor output continuity confirmed at ambient temperature; trip threshold verified where test equipment permits.
Final inspection: Impeller balance check, blade tip clearance measurement, and housing integrity inspection prior to packaging.

Test records are retained per unit and available upon request for regulated industries requiring traceability documentation.