WEG W50 High Voltage & Heavy Duty Induction Motors
The WEG W50 Series (featured model: W50 355M/U 250 kW 6.6 kV 4-Pole) is engineered specifically for severe-duty industrial applications requiring high power density, superior mechanical strength, and exceptional thermal management. Built with a rigid FC-200 cast-iron frame and advanced internal air-flow architecture, the W50 series minimizes vibration, reduces sound pressure levels, and delivers continuous performance under extreme environmental conditions. Spanning output ratings from 75 kW up to 1,250 kW in IEC frame sizes 315 to 450, the W50 accommodates low, medium, and high voltage supplies from 380 V up to 6,600 V (6.6 kV). Designed to meet IE3 and IE4 efficiency standards, the W50 is widely specified across heavy industry sectors for driving centrifugal pumps, large HVAC fans, axial blowers, screw compressors, ball mills, and heavy-duty conveyors.
Technical Specifications
| Featured Model | W50 355M/U (250 kW / 335 HP, 4-Pole, 6.6 kV, IEC 355 Frame) |
|---|---|
| Brand / Manufacturer | WEG |
| Product Series | W50 Open / TEFC Medium & High Voltage Motor Series |
| Power Range Covered | 75 kW to 1,250 kW (100 HP to 1,600 HP) |
| Voltage Ratings | 380 V up to 6,600 V (6.6 kV), 50 Hz / 60 Hz |
| Frame Sizes (IEC) | 315 to 450 (High Power Density Cast Iron Frame) |
| Efficiency Classes | IE2, IE3 (Premium Efficiency), and IE4 (Super Premium) |
| Enclosure & Cooling | IP55 / IP56 / IP65 / TEFC (IC411) or VFD Forced Ventilation (IC416) |
Documentation & Resources
WEG W50 High Voltage Power & Frame Size Selection Matrix
Selection matrix for standard WEG W50 4-Pole induction motors across common voltage levels (1500 RPM synchronous speed at 50 Hz):
| Motor Power (kW / HP) | Voltage Level | IEC Frame Size | Efficiency Level | Typical WEG Model Code |
|---|---|---|---|---|
| 110 kW (150 HP) | 400V / 690V / 3.3kV | 315S/M | IE3 Premium | W50 315S/M 110kW 4P |
| 200 kW (270 HP) | 400V / 3.3kV / 6.6kV | 355S/M | IE3 Premium | W50 355S/M 200kW 4P |
| 315 kW (425 HP) | 3.3kV / 6.0kV / 6.6kV | 355L/U | IE3 / IE4 | W50 355L/U 315kW 6.6kV |
| 450 kW (600 HP) | 3.3kV / 6.0kV / 6.6kV | 400S/M | IE3 / IE4 | W50 400S/M 450kW 6.6kV |
| 630 kW (850 HP) | 3.3kV / 6.0kV / 6.6kV | 400L/U | IE3 Premium | W50 400L/U 630kW 6.6kV |
| 800 kW (1070 HP) | 3.3kV / 6.6kV | 450S/M | IE3 Premium | W50 450S/M 800kW 6.6kV |
| 1,000 kW (1340 HP) | 6.0kV / 6.6kV | 450L/U | IE3 Premium | W50 450L/U 1000kW 6.6kV |
Legacy High Voltage Motor Replacement & Upgrade Guide
Upgrade older, bulky high-voltage motors or inefficient box-frame designs to the modern WEG W50 compact cast-iron series:
| Legacy / Older Motor Design | Modern W50 Equivalent | Key Mechanical & Performance Enhancements |
|---|---|---|
| Old Fabricated Box-Frame MV Motors | WEG W50 Cast Iron Series Higher Rigidity | Significantly reduced vibration, superior thermal dissipation, higher mechanical stiffness, and longer bearing life. |
| Low-Efficiency HV Motors (IE1/Standard) | WEG W50 IE3 / IE4 Series Energy Upgrade | Substantial reduction in electrical losses. Quick ROI on continuous duty pumps and large industrial blowers. |
| Oversized High Voltage Footprint | W50 High Power Density Design Compact Footprint | Delivers equal or higher output in a smaller IEC frame size, simplifying retrofits in space-constrained plants. |
Expert Technical Sourcing & High Voltage Plant Integration
The WEG W50 line excels due to its modular construction and high power density. Available with multiple terminal box positions, sleeve or rolling element bearings, insulated bearings for VFD duty, and custom shaft extensions, the W50 seamlessly replaces aging high-voltage motors from legacy manufacturers. Whether your facility requires direct-on-line 6.6 kV operation or variable speed control via medium-voltage VFDs, our technical team provides complete cross-referencing, dimension verification, and end-to-end supply chain support.
Core Benchmark Model Standard Configurations
- W50 315S/M 110kW 4P
- W50 315L/U 160kW 4P
- W50 355S/M 200kW 6.6kV
- W50 355M/U 250kW 6.6kV
- W50 355L/U 315kW 6.6kV
- W50 400S/M 450kW 6.6kV
- W50 400L/U 630kW 6.6kV
- W50 450S/M 800kW 6.6kV
- W50 450L/U 1000kW 6.6kV
- WEG W50 VFD Duty IC416
- WEG W50 Insulated Bearings
- WEG W50 Sleeve Bearing Option
