Description
The ebm-papst R4D500-AT03-08 (also known as R4D500AT0308) is an industrial-grade 400 VAC three-phase motorized backward-curved centrifugal impeller powered by an internal M4D138-HF external rotor motor. Engineered with a large 500 mm (19.69 in) diameter impeller and 9 sheet aluminum blades, it delivers high-performance air movement operating at 1375 RPM (1430 W, 3.0 A) at 50 Hz and 1550 RPM (2250 W, 3.88 A) at 60 Hz. The assembly features a robust cast aluminum rotor surface, maintenance-free heavy-duty ball bearings, IP20 ingress protection, Class F insulation, and an axial 1600 mm silicone harness terminated with a factory-fitted WAGO WINSTA 770 connector for rapid plug-and-play installation.
Key Features
- Three-Phase Drive: Operates on 400 VAC 50/60 Hz in star connection, delivering up to 2250 W input power.
- Robust Sheet Aluminum Impeller: Aerodynamically optimized 500 mm diameter assembly with 9 backward-curved blades ensures maximum pressure stability.
- External Rotor Architecture: Driven by an integrated M4D138-HF motor with a cast aluminum rotor surface and dual ball bearings.
- Pre-Terminated Silicone Harness: Equipped with a 1600 mm 4G 1.50 mm² silicone cable and quick-disconnect WAGO WINSTA 770 plug.
- Flexible Mounting & Drainage: Supports any installation position with dedicated rotor- and stator-side condensation drainage channels.
- VFD Inverter Ready: Designed for continuous S1 duty and inverter control up to 1900 RPM when paired with all-pole sine filters.
Technical Specifications
| Manufacturer | ebm-papst |
|---|---|
| Manufacturer Part Number (MPN) | R4D500-AT03-08 |
| Alternate Part Number | R4D500AT0308 |
| Integrated Motor Model | M4D138-HF |
| Product Category | AC Centrifugal Fans |
| Fan / Component Type | Motorized Centrifugal Impeller (Without Scroll Housing) |
| Phase & Supply Type | 3~ Three-Phase AC |
| Rated Voltage | 400 VAC |
| Wiring Connection | Star (Y) |
| Frequency | 50 Hz / 60 Hz |
| Speed (RPM) | 1375 RPM (50 Hz) / 1550 RPM (60 Hz) |
| Power Rating | 1430 W (50 Hz) / 2250 W (60 Hz) |
| Rated Current | 3.0 A (50 Hz) / 3.88 A (60 Hz) |
| Starting Current | 14.0 A (50 Hz) / 12.0 A (60 Hz) |
| Max. Safe Operating Speed | 1900 RPM |
| Impeller Size | Ø 500 mm (19.69 in) |
| Number of Blades | 9 |
| Dimensions (Overall Diameter × Height) | Ø 505 mm × 250.5 mm (Ø 19.88 in × 9.86 in) |
| Mounting Hole Pattern | 8 × M10 on Ø 480 mm pitch circle |
| Max. Screw Clearance Depth | 18 mm (0.71 in) |
| Screw Strength Class | 8.8 |
| Inlet Diameter (Accessory Interface) | Ø 337 mm (13.27 in) |
| Compatible Inlet Ring (Optional) | 63072-2-4013 |
| Impeller Material | Sheet aluminum |
| Rotor Surface | Cast in aluminum |
| Motor Bearing Type | Maintenance-free ball bearings |
| Direction of Rotation | Clockwise, viewed toward rotor |
| Installation Position | Any (Horizontal or Vertical) |
| Condensation Drainage Holes | On rotor and stator sides |
| Cooling Holes / Openings | On rotor side |
| Operating Mode / Duty Cycle | Continuous operation (S1) |
| Weight | 22.3 kg (49.16 lbs) |
| Cable Specification | Silicone cable 4G 1.50 mm² (AWG 16 equivalent) |
| Cable Length | 1600 mm ± 50 mm (63.0 in ± 1.97 in) |
| Cable Exit | Axial |
| Connector Plug Type | WAGO WINSTA 770 connector |
| Wiring Pinout | PE = Green/Yellow, L1 = Black, L2 = Blue, L3 = Brown |
| Rotation Reversal Method | Reverse any two phase conductors |
| Motor Protection | Without internal thermal overload protector (Requires external motor protection switch) |
| Electrical Protection Class | Class I (with customer protective earth connection) |
| Touch Current (IEC 60990) | ≤ 3.5 mA (TN system, measuring circuit Fig. 4) |
| Insulation Class | Class F |
| Ingress Protection Rating | IP20 |
| Moisture / Environmental Class | F0 |
| Operating Temperature Range | -40°C to +80°C / -40°F to +176°F (50 Hz); -40°C to +45°C / -40°F to +113°F (60 Hz) |
| Storage / Transport Temperature Range | -40°C to +80°C (-40°F to +176°F) |
| Permissible Ambient Air Pressure | 800 mbar to 1050 mbar |
| Vibration Severity Limit (ISO 14694) | ≤ 3.5 mm/s (measured at motor support plate) |
| Standards & Compliance | EN 61800-5-1, EN 60034, EAC |
Applications
The ebm-papst R4D500-AT03-08 motorized centrifugal impeller is engineered specifically for mission-critical mission applications including Stulz precision air conditioning units, computer room air handlers (CRAH), and data center CRAC systems. Its high-volume aerodynamic design makes it ideal for cleanroom fan filter units (FFUs), commercial air handling unit (AHU) plenums, and central heat recovery ventilation systems. Furthermore, plant engineers deploy this robust assembly in high-capacity refrigeration condensers, industrial chiller enclosures, and forced-air cooling circuits within heavy-duty manufacturing facilities.
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