Description
The ebm-papst R2E250-AL03-10 (also known as R2E250AL0310) is a single-intake, backward-curved unhoused AC motorized impeller powered by an integrated M2E068-GA single-phase external rotor motor, measuring 252 mm (9.92 in) in outer diameter with a compact axial depth of 120.5 mm (4.74 in). Engineered for high aerodynamic efficiency in pressurized equipment plenums, this unit operates on 230 VAC at 60 Hz to generate up to 985 CFM (1670 m³/h) of free-air volume and sustains back pressures exceeding 1.81 in H₂O (450 Pa) while drawing 315 W and 1.40 A at 3000 RPM. The impeller structure is fabricated from robust hot-dip galvanized sheet steel featuring 11 aerodynamic blades driven by heavy-duty dual ball bearings for versatile mounting in any installation orientation. Complete with an internally connected thermal overload protector (TOP) and a 3-conductor AWG 20 flying lead cable harness, this Class B insulated motorized fan guarantees safe, continuous S1 operation across demanding industrial ventilation and thermal management systems.
Key Features
- High-Output Impeller Aerodynamics: Delivers 985 CFM (1670 m³/h) airflow and withstands static pressures reaching 1.81 in H₂O (450 Pa).
- Galvanized Steel Construction: Employs 11 precision backward-curved blades fabricated from hot-dip galvanized sheet steel for corrosion resistance.
- Integrated Thermal Protection: Features an internally connected thermal overload protector safeguarding the Class B motor from severe overtemperatures.
- Heavy-Duty Ball Bearings: Engineered with maintenance-free ball bearings allowing continuous S1 duty in any mechanical mounting orientation.
- Single-Phase Capacitor Motor: Driven by an external rotor M2E068-GA motor utilizing a 7 µF / 450 VDB run capacitor.
Technical Specifications
| Manufacturer | ebm-papst |
|---|---|
| Manufacturer Part Number (MPN) | R2E250-AL03-10 |
| Alternate Part Number | R2E250AL0310 |
| Integrated Motor Model | M2E068-GA |
| Product Series | R2E250 |
| Product Category | AC Centrifugal Fans |
| Fan / Component Type | Backward-Curved Motorized Impeller (Unhoused) |
| Phase & Supply Type | Single-Phase (1~) AC |
| Rated Voltage | 230 VAC |
| Frequency | 60 Hz |
| Nominal Speed (RPM) | 3000 RPM |
| Power Consumption | 315 W (Free Air) / up to 348 W (Loaded) |
| Rated Current Draw | 1.40 A (Free Air) / 1.52 A (Loaded) |
| Starting Current | 2.5 A |
| Run Capacitor Requirement | 7.0 µF / 450 VDB |
| Airflow (Free Air) | 985 CFM (1670 m³/h) |
| Static Pressure (Max Tabulated) | 1.81 in H₂O (450 Pa) |
| Airflow Direction | Centrifugal / Radial Outflow |
| Direction of Rotation | Clockwise, viewed toward rotor |
| Impeller Diameter | 252 mm (9.92 in) / 250 mm Fan Size |
| Impeller Depth / Thickness | 120.5 mm (4.74 in) |
| Blade Count | 11 |
| Impeller Material | Sheet steel, hot-dip galvanized |
| Rotor Surface | Open rotor |
| Bearing Type | Dual Ball Bearings |
| Installation Position | Any (Universal) |
| Operating Mode / Duty Cycle | Continuous (S1) |
| Condensation Drainage | None, open rotor |
| Max Screw Clearance | 5.0 mm |
| Weight | 4.1 kg (9.04 lbs) |
| Termination & Cable Specs | AWG 20 (3x 0.5 mm²) Cable with 3x Crimped Splices |
| Wiring Pinout / Connection | U1 = Blue, Z = Brown, U2 = Black |
| Motor Protection | Thermal Overload Protector (TOP) internally connected |
| Electrical Protection Class | Class I (with customer protective earth connection) |
| Insulation Class | Class B |
| Ingress Protection (IP) | IP00 (Motor) |
| Touch Current (IEC 60990) | < 0.75 mA (Measuring Circuit Fig. 4, TN system) |
| Moisture / Environmental Class | H0 – dry environment |
| Operating Temperature Range | -25 °C to +35 °C (-13 °F to +95 °F) |
| Permissible Storage / Transport Temperature | -40 °C to +80 °C (-40 °F to +176 °F) |
| Optional Accessory | Inlet ring 96359-2-4013 (sold separately) |
| Standards & Compliance | EN 60335-1, CE, UL 2111 Approved, RoHS3 Compliant |
Applications
The ebm-papst R2E250-AL03-10 motorized centrifugal impeller is primarily utilized in precision climate equipment such as data center CRAC and CRAH cooling modules, cleanroom Fan Filter Units (FFUs), and commercial building heat recovery ventilation (HRV) plenums. Its unhoused backward-curved profile excels in modular ducted air handlers, high-efficiency particulate air (HEPA) filtration cabinets, and industrial process drying ovens requiring stable airflow against heavy downstream filter resistance. Plant maintenance teams and OEM engineers also integrate this high-pressure motorized impeller into enclosed electrical cabinet heat exchangers and telecommunications base station cooling racks.
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