Aluminum Shell VFD Braking Resistor Dynamic Braking Unit 50W-3000W
VFD Dynamic Braking Unit 50W
,Aluminum Shell Braking Resistor
,VFD Braking Resistor 3000W
Anyhz aluminum shell braking resistors provide reliable dynamic braking for variable frequency drives (VFDs) and servo systems from 50W to 3000W. These wirewound resistors convert regenerative energy into heat during motor deceleration, preventing VDC bus overvoltage and enabling controlled, rapid stopping of high-inertia loads.
Designed for industrial automation, CNC machine tools, cranes, elevators, and high-inertia machinery, our braking resistors feature golden anodized aluminum shells for superior heat dissipation, allowing continuous operation at 10% duty cycle with 100% braking torque. The robust construction withstands harsh factory environments including vibration, dust, and temperature extremes.
- Superior Heat Dissipation: Golden aluminum shell with heat sink design, 30% better cooling than steel enclosures
- High Power Density: 50W-3000W range covers applications from small servo drives to large crane systems
- Wide Voltage Compatibility: 220V, 380V, 440V AC systems with optimized resistance values
- Industrial Durability: Vibration resistant, weatherproof, non-combustible inorganic packaging
- Easy Installation: Multiple terminal options, compact size, panel or chassis mount
- Long Service Life: High overload capacity, low resistance drift, maintenance-free operation
- Cost Effective: 20-30% lower cost than branded braking units with comparable performance
The golden anodized aluminum shell provides exceptional thermal conductivity and corrosion resistance. Unlike painted steel enclosures that trap heat, the aluminum shell acts as a heat sink, dissipating braking energy 30% more efficiently.
- Thermal conductivity: 205 W/m*K (aluminum vs 50 for steel)
- Anodized layer: 25μm hard coat for durability
- Surface area optimized for natural convection
- Mounting holes for heat sink attachment
Wirewound construction using high-grade resistance wire wound on ceramic cores provides stable resistance values and high overload capacity.
- Resistance tolerance: ±5% standard, ±1% available
- Temperature coefficient: ±50 ppm/°C (excellent stability)
- Overload capacity: 10* rated power for 5 seconds
- Non-inductive winding options for high-frequency applications
The resistor element is encapsulated in non-combustible inorganic materials that withstand extreme temperatures without decomposition or toxic fume emission.
- Fire rating: UL94 V-0 equivalent
- Operating temperature: -55°C to +275°C
- Moisture resistance: IP54 with terminal covers
- Vibration resistance: 5g (10-500Hz)
220V System Braking Resistor Selection (100% Braking Torque, 10% Duty Cycle)
| VFD Power (kW) | Motor HP | Resistance (Ω) | Power (W) | Quantity | Typical Application |
|---|---|---|---|---|---|
| 1.5 | 2 | 130Ω | 260W | 1 | Small conveyors, fans |
| 2.2 | 3 | 80Ω | 260W | 1 | Pumps, small machines |
| 4 | 5 | 48Ω | 400W | 1 | Machine tools, mixers |
| 5.5 | 7.5 | 35Ω | 550W | 1 | CNC spindles, conveyors |
| 7.5 | 11 | 26Ω | 780W | 1 | Larger CNC, hoists |
| 11 | 15 | 17Ω | 1100W | 1 | Cranes, elevators |
| 15 | 20 | 13Ω | 1800W | 1 | Heavy cranes, pumps |
| 18.5 | 25 | 10Ω | 2000W | 1 | Large elevators, fans |
| 22 | 30 | 8Ω | 2500W | 1 | Heavy industry |
| 30 | 40 | 13Ω | 1800W | 2 | Parallel for high power |
380V System Braking Resistor Selection (100% Braking Torque, 10% Duty Cycle)
| VFD Power (kW) | Motor HP | Resistance (Ω) | Power (W) | Quantity | Typical Application |
|---|---|---|---|---|---|
| 1.5 | 2 | 400Ω | 260W | 1 | Small conveyors |
| 2.2-4 | 3-5 | 150Ω | 390W | 1 | Pumps, fans |
| 5.5 | 7.5 | 100Ω | 520W | 1 | Machine tools |
| 7.5-11 | 11-15 | 50Ω | 1040W | 1 | CNC, conveyors |
| 15 | 20 | 40Ω | 1560W | 1 | Large CNC, hoists |
- Resistance Range: 2Ω to 400Ω (custom values available)
- Power Range: 50W to 3000W (higher power by parallel connection)
- Voltage Rating: AC 220V, 380V, 440V (DC bus voltage dependent)
- Resistance Tolerance: ±5% standard, ±1% available
- Temperature Coefficient: ±50 ppm/°C
- Operating Temperature: -55°C to +275°C
- Insulation Resistance: >1kΩ (1000VDC)
- Dielectric Strength: 2000VAC, 1 minute
- Protection Class: IP54 with terminal covers
- Duty Cycle: 10% ED standard, 25% and 40% ED available
- Cooling: Natural convection (standard), forced air (high duty)
| Feature | Anyhz Aluminum Shell | Steel Enclosure Resistors | Ceramic Resistors | Impact on Your Application |
|---|---|---|---|---|
| Heat Dissipation | Excellent (aluminum heat sink) | Poor (steel traps heat) | Good (but fragile) | ✓ 30% better cooling, longer life |
| Durability | Rugged (vibration resistant) | Good | Poor (cracks easily) | ✓ Survives industrial vibration |
| Environmental | IP54, weatherproof | IP20-IP54 | IP20 (exposed wires) | ✓ Suitable for harsh environments |
Bottom line: Anyhz aluminum shell braking resistors offer the optimal combination of heat dissipation, durability, and safety for industrial VFD applications. Unlike cheap steel or ceramic alternatives, they withstand factory conditions while providing reliable braking performance.
★★★★★ 4.8/5 based on 423 braking resistor installations
-- Li Wei, Maintenance Manager, Hebei Heavy Machinery
-- Wang Tao, Purchasing Director, Jiangsu CNC Systems
Use our selection tables based on VFD power rating and input voltage (220V or 380V). The tables provide optimal resistance values for 100% braking torque at 10% duty cycle --suitable for most applications. For high-duty cycles (cranes, elevators), select the next higher power rating or contact us for 25%/40% ED versions.
Duty cycle (ED) is the ratio of braking time to total cycle time. 10% ED means 6 minutes braking per hour--typical for CNC, pumps, and fans. 25% ED means 15 minutes braking per hour for cranes and hoists. 40% ED means 24 minutes braking per hour for extreme applications like elevators or test stands.
Surface temperature reaches 200-250 °C at full load--hot enough to cause burns but normal for braking resistors. The golden aluminum shell dissipates heat efficiently, but maintain 100mm clearance from heat-sensitive components and ensure adequate ventilation.
Anyhz aluminum shell braking resistors (50W-3000W) provide reliable VFD dynamic braking with superior heat dissipation, industrial durability, and 20-30% cost savings. Ideal for CNC, cranes, elevators, and high-inertia machinery.
