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Industrial power systems often operate under heavy loads, frequent braking, vibration, and elevated temperatures. To ensure reliable operation in these demanding environments, the DUFEW Trapezoidal Aluminum Clad Resistor combines a rugged aluminum enclosure with an optimized internal thermal structure that efficiently transfers heat while protecting the resistor element from dust, moisture, vibration, and mechanical impact.
The resistance element is manufactured using precision-wound Nickel-Chromium (Ni-Cr) or Constantan alloy wire mounted on a high-temperature insulating core. After electrical insulation with mica sheets, the assembly is fully encapsulated inside a trapezoidal aluminum housing using a specially formulated mixture of high-purity quartz sand and high-temperature resin. This structure creates an efficient thermal conduction path, rapidly transferring internal heat to the external cooling fins while protecting the resistor from oxidation and environmental contamination.
Designed for industrial automation and heavy-duty equipment, the resistor supports both stainless steel terminal and high-temperature lead wire connections, allowing flexible installation in VFD braking systems, servo drives, motor control cabinets, load banks, renewable energy equipment, and industrial power distribution systems.
Unlike conventional rectangular aluminum resistors, the trapezoidal housing is specifically engineered to improve both cooling efficiency and mechanical stability in industrial environments.
The trapezoidal profile increases the external cooling surface, allowing heat to dissipate more efficiently through natural convection and improving continuous operating performance.
The resistor element is completely sealed inside the aluminum housing, providing excellent resistance to dust, moisture, vibration, and oxidation while extending product service life.
A wider mounting base offers stronger mechanical support, reducing movement under continuous vibration and making the resistor suitable for cranes, elevators, machine tools, and other heavy-duty equipment.
Quartz sand filling transfers heat much faster than air, allowing internal heat to reach the aluminum housing quickly for improved cooling performance. Additional heat sinks can be installed when higher continuous power dissipation is required.
- Optimized Trapezoidal Housing -- Larger cooling surface improves natural heat dissipation compared with conventional rectangular aluminum resistors.
- Fully Potted Construction -- Complete encapsulation protects against dust, moisture, vibration, oxidation, and mechanical shock.
- Excellent Thermal Conductivity -- Quartz sand filling rapidly transfers internal heat to the aluminum housing, supporting higher power density.
- Wide Resistance Range -- Available from 0.01Ω to 120kΩ with resistance tolerances of ±3%, ±5%, and ±10%.
- Reliable Mechanical Strength -- Wide aluminum base ensures secure mounting for equipment operating under continuous vibration.
- Flexible Connection Options -- Available with stainless steel terminals or high-temperature lead wires for different installation requirements.
- Custom Manufacturing Available -- Power rating, resistance value, dimensions, terminals, and mounting configurations can be customized for OEM projects.
The Trapezoidal Aluminum Clad Resistor is suitable for industrial systems requiring reliable power dissipation, high mechanical strength, and long-term stability.
Variable frequency drives (VFDs), servo drives, motor braking circuits, and regenerative energy dissipation systems.
Cranes, elevators, rolling mills, mining machinery, compressors, and other equipment operating under frequent vibration and braking conditions.
Load banks, power supply testing, battery discharge systems, dynamic load simulation, and industrial test benches.
Energy storage equipment, photovoltaic inverters, wind power converters, charging equipment, and power conversion systems.
Electrical cabinets, distribution equipment, automation systems, and OEM machinery requiring compact, sealed, and high-reliability power resistors.
Proper installation is essential to achieve optimum thermal performance and long service life.
Confirm that the resistance value, power rating, operating voltage, and dimensions meet the equipment requirements before installation.
Check that the aluminum housing, terminals, and mounting holes are free from deformation, cracks, or shipping damage.
Install the resistor firmly using the mounting holes on the base. Ensure the mounting surface is flat and rigid to maintain good mechanical stability.
For medium- and high-power applications, apply a thin layer of thermal compound between the resistor base and the mounting plate or heat sink to improve heat transfer.
Connect the terminals or lead wires securely and verify that all electrical connections are tight to prevent excessive contact resistance.
Install the resistor in a well-ventilated location. For enclosed electrical cabinets, forced-air cooling is recommended when operating at high power.
Measure the resistance value before energizing the circuit and monitor the operating temperature during initial commissioning.
The resistor element is precision wound using high-quality Nickel-Chromium (Ni-Cr) or Constantan alloy wire to provide stable electrical performance, high overload capability, and long service life.
A durable mica insulation layer electrically isolates the resistance wire from the aluminum housing while maintaining excellent dielectric strength under elevated temperatures.
The internal cavity is filled with high-purity quartz sand and heat-resistant resin, creating an efficient thermal conduction path that rapidly transfers heat from the resistor element to the aluminum housing.
The extruded aluminum enclosure features an optimized trapezoidal profile that increases the cooling surface area and improves natural air convection compared with conventional rectangular housings.
Available with either stainless steel terminals or high-temperature lead wires to accommodate different installation and wiring requirements.
| Model Code | Description | Example |
|---|---|---|
| CAR | Trapezoidal Aluminum Clad Resistor Series | CAR |
| 1500W | Rated Power | 1500W |
| 27R | Rated Resistance | 27Ω |
| J | Resistance Tolerance | J = ±5% (Optional: H = ±3%, K = ±10%) |
| Parameter | Specification |
|---|---|
| Power Range | 50W--6kW |
| Operating Voltage | ≤1200V |
| Resistance Range | 0.01Ω--120kΩ |
| Resistance Tolerance | ±3% / ±5% / ±10% |
| Protection Rating | IP00 |
| Temperature Coefficient (TCR) | ≤300 ppm/°C |
| Flame Retardant Rating | UL 94V-2 |
| Standard | GB/T 5792 |
| Characteristic | Test Conditions | Performance |
|---|---|---|
| Dielectric Withstand Voltage | 2500VAC / 50Hz / 60s | Leakage Current ≤10mA |
| Insulation Resistance | 1000VDC | ≥100MΩ |
| Short-Time Overload | 10× Rated Power for 5 Seconds | No Visible Damage |
| Load Life | Cyclic Operation (10s ON / 90s OFF) | ＞9,000 Hours |
| Damp Heat Resistance | 40°C ±2°C, 90--95% RH, 100h | ΔR ≤ ±(1%R + 0.05Ω) |
| Rapid Temperature Cycling | -55°C / 55°C / 155°C, 15 Minutes Each, 5 Cycles | ΔR ≤ ±(2%R + 0.05Ω) |
| Heat Resistance | 350°C for 2 Hours | No Visible Discoloration or Damage |
| Temperature Coefficient | Rated Load vs. Cold Resistance | ＜300 ppm/°C |
| Flame Resistance | 10× Rated Power for 5 Minutes | No Ignition or Open Flame |
| Characteristic | Test Conditions | Performance |
|---|---|---|
| Terminal Strength | 45N / 30s | No Loosening or Visible Damage |
| Vibration Resistance | 5--200Hz, 1g, 98m/s² | No Visible Structural Damage |
| Resistance to Soldering Heat | Terminals Immersed in 350±5°C Solder for 3 Seconds | ΔR ≤ ±(1%R + 0.05Ω) |
| Appearance | Visual Inspection | No Visible Damage, Clear Marking |
| Solderability | Terminals Immersed in 235±5°C Solder for 5 Seconds | Solder Coverage ≥95% |
| Comparison Item | Trapezoidal Aluminum Clad Resistor | Conventional Rectangular Aluminum Housed Resistor |
|---|---|---|
| Housing Design | Trapezoidal profile increases heat dissipation area and airflow efficiency | Standard rectangular housing with smaller cooling surface |
| Thermal Management | Quartz-filled construction transfers heat quickly to the aluminum housing for more stable operating temperatures | Heat dissipation mainly depends on the housing surface, resulting in lower thermal efficiency |
| Mounting Stability | Wide base provides excellent mechanical stability for vibration-prone equipment | Narrower base offers lower resistance to vibration |
| Environmental Protection | Fully sealed construction resists dust, moisture, oxidation, and mechanical contamination | Standard sealing provides limited protection in harsh industrial environments |
| High-Resistance Capability | Resistance values available up to 120kΩ with stable performance | High resistance options are generally more limited |
A: The trapezoidal aluminum housing increases the external cooling surface and improves natural airflow around the resistor. It also provides a wider mounting base for better mechanical stability, making it suitable for heavy-duty industrial equipment.
A: Yes. The quartz-filled encapsulation efficiently transfers internal heat to the aluminum housing, allowing the resistor to withstand repetitive braking cycles and short-term overloads while maintaining reliable performance.
A: Yes. Optional built-in thermal switches or temperature sensors can be integrated upon request to provide additional over-temperature protection for unattended or safety-critical applications.
A: Yes, provided all resistors have identical specifications. Uniform ventilation, balanced wiring, and proper heat dissipation should be maintained to ensure even load distribution and long-term reliability.
- Professional Power Resistor Manufacturer with years of experience in industrial power electronics.
- OEM & ODM Customization for resistance, power rating, dimensions, terminals, and mounting options.
- Strict Quality Control with comprehensive electrical and mechanical testing before shipment.
- Fast Production & Stable Supply for both standard models and custom projects.
- Technical Support to help customers select the most suitable resistor solution for their application.
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