WEG W21 Low Voltage Aluminum Motors
The WEG W21 Series (featured model: W21 90L-4 1.5 kW IE3) delivers the perfect balance of lightweight design, excellent thermal performance, and exceptional mounting flexibility. Constructed from a high-quality injected aluminum frame, the W21 motor is significantly lighter than its cast-iron counterparts, making it the ideal choice for applications where weight reduction and space constraints are critical. A defining feature of the WEG W21 is its multimounting capability; the removable feet allow the terminal box to be positioned on the top, left, or right side without disassembling the motor, drastically reducing OEM inventory requirements. Covering a versatile power range from 0.12 kW to 37 kW across standard IEC frame sizes (63 to 200L), the W21 series is fully compliant with global energy standards, available in IE2 Standard and IE3 Premium Efficiency. It is the premier general-purpose motor for packaging machinery, HVAC systems, water pumps, light conveyors, and automated manufacturing equipment.
Technical Specifications
| Featured Model | W21 90L-4 (1.5 kW / 2.0 HP, 4-Pole, 1440 RPM, IEC 90L Frame) |
|---|---|
| Brand / Manufacturer | WEG |
| Product Series | W21 Low Voltage Aluminum Motor |
| Power Range Covered | 0.12 kW to 37 kW (0.16 HP to 50 HP) |
| Frame Sizes (IEC) | 63 to 200L (Injected Aluminum Frame) |
| Efficiency Classes | IE2 (Standard Efficiency), IE3 (Premium Efficiency) |
| Number of Poles | 2, 4, 6, and 8 poles available |
| Enclosure & Mounting | IP55 / TEFC (IC411) / Multimounting (Removable Feet - B3, B5, B14, B34, B35) |
Documentation & Resources
WEG W21 Motor Power Rating & Frame Size Matrix
Complete selection matrix for WEG W21 4-Pole (1500 RPM synchronous) low voltage aluminum motors. Review rated motor power, IEC frame sizes, and efficiency classes:
| Motor Power (kW / HP) | Poles / Speed | IEC Frame Size | Efficiency Class | Typical WEG Model Code (4-Pole) |
|---|---|---|---|---|
| 0.12 kW (0.16 HP) | 4-Pole (~1380 RPM) | 63 | IE2 / IE3 | W21 63-4 0.12kW |
| 0.75 kW (1.0 HP) | 4-Pole (~1440 RPM) | 80 | IE3 Premium | W21 80-4 0.75kW IE3 |
| 1.5 kW (2.0 HP) | 4-Pole (~1440 RPM) | 90L | IE3 Premium | W21 90L-4 1.5kW IE3 |
| 3.0 kW (4.0 HP) | 4-Pole (~1450 RPM) | 100L | IE3 Premium | W21 100L-4 3.0kW IE3 |
| 5.5 kW (7.5 HP) | 4-Pole (~1460 RPM) | 132S | IE3 Premium | W21 132S-4 5.5kW IE3 |
| 11.0 kW (15.0 HP) | 4-Pole (~1460 RPM) | 160M | IE3 Premium | W21 160M-4 11kW IE3 |
| 18.5 kW (25.0 HP) | 4-Pole (~1465 RPM) | 180M | IE3 Premium | W21 180M-4 18.5kW IE3 |
| 30.0 kW (40.0 HP) | 4-Pole (~1470 RPM) | 200L | IE3 Premium | W21 200L-4 30kW IE3 |
Cast Iron to WEG W21 Aluminum Conversion & Upgrade Guide
Upgrade traditional heavy cast iron motors or obsolete models to the lightweight, versatile WEG W21 aluminum series for enhanced OEM flexibility:
| Legacy / Standard Motor Type | Current W21 Aluminum Equivalent | Key Performance & Installation Upgrades |
|---|---|---|
| Standard Heavy Cast Iron Motors (≤ 37kW) | W21 Aluminum Series Weight Reduction | Significantly lighter frame. Reduces structural stress on OEM machinery, brackets, and HVAC fan units without sacrificing IE3 performance. |
| Fixed-Foot General Purpose Motors | W21 Multimounting Series OEM Flexibility | Removable feet allow the terminal box to be positioned top, left, or right. Allows OEMs to stock one motor code for multiple mounting setups (B3/B5/B14/B34). |
| Standard IE1/IE2 Aluminum Motors | W21 IE3 Premium Series Energy Upgrade | 100% standard IEC mounting dimensions. Delivers massive energy savings over the motor's lifecycle with superior thermal dissipation. |
Expert Technical Sourcing & OEM System Integration Notes
Whether your production line requires standard foot-mounted setups (B3), small flange (B14), large flange (B5), or foot/flange combinations (B34/B35), the WEG W21 adapts instantly. When replacing older, bulky cast iron motors in applications like rooftop HVAC units, commercial water pumps, or clean-environment packaging lines, upgrading to the lightweight WEG W21 IE3 series provides rapid ROI through energy savings and reduced structural wear. Simply provide us with your existing motor's nameplate data or desired IEC frame configuration, and our engineering team will deliver a 100% compliant specification and rapid global supply proposal.
Core Benchmark Model Standard Configurations
- W21 63-4 (0.12 kW IE2/IE3)
- W21 71-4 (0.37 kW IE3)
- W21 80-4 (0.75 kW IE3)
- W21 90S-4 (1.1 kW IE3)
- W21 90L-4 (1.5 kW IE3)
- W21 100L-4 (3.0 kW IE3)
- W21 112M-4 (4.0 kW IE3)
- W21 132S-4 (5.5 kW IE3)
- W21 132M-4 (7.5 kW IE3)
- W21 160M-4 (11 kW IE3)
- W21 160L-4 (15 kW IE3)
- W21 180M-4 (18.5 kW IE3)
- W21 200L-4 (30 kW IE3)
- WEG W21 Multimounting B34
- WEG W21 VFD Inverter Duty
- WEG W21 Flange Mount B5/B14
