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We offer a comprehensive portfolio including resistors, braking units, reactors, power filters, and transformers, with full customization options to meet diverse application requirements.
DUFEW Tubular Resistor is a high-power wirewound component built with a ceramic tube structure that provides electrical insulation and efficient heat transfer. Resistance wires made from Nickel-Chromium (Ni-Cr), Manganin, or Constantan alloy are precisely wound around the ceramic core to achieve stable resistance, strong overload capability, and consistent thermal performance.
The ceramic tube design improves power density and cooling efficiency by transferring heat through the internal core structure. After winding, the resistor is coated with a high-temperature flame-retardant insulating layer to protect the resistance wire from oxidation, moisture, and environmental influence, helping maintain stable operation in industrial conditions.
Suitable for industrial power applications, this resistor is commonly used in VFD braking systems, motor starting circuits, load testing equipment, welding machines, and other electrical systems requiring controlled energy dissipation and reliable thermal performance.
The resistor converts electrical energy into heat through a resistance alloy wire wound around a ceramic tube. The ceramic core provides insulation while helping transfer heat to the surrounding environment for effective temperature control.
With stable performance under high current, short-time overload, and repeated switching conditions, it is suitable for dynamic braking, motor starting, current limiting, load simulation, voltage dropping, and energy consumption applications.
| Model Code | Meaning | Description |
|---|---|---|
| CRR | Product Series | Tubular Resistor |
| 2500W | Rated Power | 2500 Watts |
| 54.4R | Rated Resistance | 54.4 Ω |
| J | Resistance Tolerance | J = ±5% (Optional: K = ±10%, H = ±3%) |
| Parameter | Specification |
|---|---|
| Power Range | 50W--10kW |
| Operating Voltage | ≤1200V |
| Resistance Range | 0.01Ω--1kΩ |
| Resistance Tolerance | ±3%, ±5%, ±10% |
| Protection Rating | IP00 |
| Temperature Coefficient (TCR) | ≤300 ppm/°C |
| Flame Retardant Rating | UL 94V-2 |
| Compliance Standard | GB/T 5792 |
The winding structure directly affects the resistor's heat dissipation capability, inductance, and application suitability.
The resistance wire is wound in a conventional spiral pattern around the ceramic tube. This structure offers a simple and economical solution for low-frequency power dissipation applications where inductance is not a critical concern.
The resistance wire is formed into a corrugated profile and mounted vertically on the ceramic tube. This design significantly increases the cooling surface area while reducing parasitic inductance, making it ideal for VFD braking systems, pulse loads, and applications requiring improved thermal performance.
Provides a permanent resistance value and is suitable for most standard industrial applications requiring stable and maintenance-free operation.
Resistance can be adjusted using a movable metal clamp or tapping mechanism, allowing flexible resistance settings for equipment commissioning, testing, and variable load applications.
Available with multiple tapping points to provide different resistance values from a single resistor, making it suitable for complex electrical circuits and multi-stage load control.
Manufactured from high-quality insulating ceramic, the tube provides excellent dielectric strength, efficient heat transfer, high mechanical strength, and outstanding resistance to thermal shock during continuous industrial operation.
Available in Nickel-Chromium (Ni-Cr), Manganin, and Constantan alloys, the resistance wire offers stable electrical characteristics, excellent overload capability, and long-term resistance stability under repeated thermal cycling.
An environmentally friendly inorganic insulating coating protects the resistance wire against oxidation, moisture, dust, and corrosion while providing reliable flame-retardant performance in accordance with UL94V-2 requirements.
The ceramic tube functions as both an insulating support and an efficient heat dissipation medium, allowing the resistor to deliver higher power ratings within a compact footprint. This makes it ideal for industrial applications where installation space is limited.
The high thermal conductivity of the ceramic tube enables rapid heat transfer from the resistance wire to the surrounding air. The optional vertical corrugated winding further increases the cooling surface area, improving continuous load performance and reducing operating temperature.
Manufactured with high-quality ceramic materials and protected by a high-temperature inorganic insulating coating, the resistor can withstand operating temperatures up to 350°C. Glass-enamel coated versions are available for applications requiring temperatures up to 375°C.
Designed for high-current and short-duration overload applications, the resistor provides excellent resistance to thermal shock and repeated pulse loading. It is well suited for motor starting, dynamic braking, and load testing applications.
DUFEW offers fixed, adjustable, multi-terminal, low-inductance, and custom-designed tubular resistors to meet diverse electrical and mechanical requirements across different industries.
The resistor can be supplied with a variety of mounting brackets and terminal configurations, allowing convenient installation in electrical cabinets, load banks, testing equipment, and industrial machinery.
Premium resistance alloy wire, a durable ceramic structure, and an oxidation-resistant protective coating ensure stable resistance values, excellent thermal stability, and extended service life under demanding operating conditions.
Widely used in welding machines, industrial control cabinets, and electrical automation systems for current limiting, voltage dropping, and energy dissipation.
Suitable for load banks, burn-in testing equipment, battery discharge systems, and power supply aging tests where stable power dissipation is required.
Applied in small and medium-power VFD braking systems, motor starting circuits, servo drive systems, and industrial transmission equipment requiring reliable braking and load control.
Used in electrical measurement equipment, protection circuits, switchgear, and control panels to provide stable resistance and improve circuit reliability.
An ideal replacement solution for industrial equipment maintenance, machine upgrades, and OEM manufacturing, with flexible customization available for international customers.
| 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, 100 Hours | 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 (TCR) | Rated Load vs. Initial Resistance | ＜300 ppm/°C |
| Flame Resistance | 10× Rated Power for 5 Minutes | Glows Red Without Open Flame |
| Characteristic | Test Conditions | Performance |
|---|---|---|
| Terminal Strength | 45N / 30 Seconds | 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) |
| Solderability | Terminals Immersed in 235±5°C Solder for 5 Seconds | Solder Coverage ≥95% |
Note: All performance data are measured under standard laboratory conditions in accordance with GB/T 5792. Actual performance may vary depending on installation conditions, ambient temperature, and operating duty cycle.
| Comparison Item | DUFEW Tubular Resistor | Conventional Non-Tubular Power Resistor |
|---|---|---|
| Core Structure | High-strength ceramic tube serves as both the insulating support and heat dissipation medium | Support structure is primarily mechanical, with relatively limited heat dissipation capability |
| Power Density | Higher power output within the same installation space due to efficient thermal conduction | Lower power density because of structural and cooling limitations |
| Heat Dissipation | Ceramic tube provides rapid heat transfer; optional corrugated winding further improves cooling efficiency | Heat dissipation depends mainly on surface area and is generally less efficient |
| Configuration Options | Available in fixed, adjustable, multi-terminal, and low-inductance versions | Mostly fixed-resistance designs with limited configuration flexibility |
| Mechanical Strength | Thick-wall alumina ceramic construction offers excellent impact resistance and long-term structural stability | Thin ceramic or film-based structures are more susceptible to cracking or damage during transportation and installation |
| Maintenance | Smooth cylindrical surface minimizes dust accumulation and simplifies routine cleaning | Irregular surfaces can collect dust more easily, requiring more frequent cleaning |
| Typical Applications | Dynamic braking, motor starting, load banks, testing equipment, industrial automation, welding machines | General-purpose electronic circuits and conventional power dissipation applications |
DUFEW specializes in the design and manufacturing of industrial power resistors and power electronic components, providing reliable products for global OEMs, distributors, and industrial users.
Our product portfolio includes tubular resistors, corrugated resistors, aluminum housed resistors, braking resistor banks, reactors, braking units, transformers, filters, and load testing systems.
Every product is manufactured under standardized production processes and undergoes comprehensive electrical and mechanical testing before shipment to ensure stable performance and consistent quality.
We provide customized resistance values, power ratings, dimensions, terminal types, winding structures, and mounting solutions based on customer drawings or application requirements.
With modern manufacturing facilities and an experienced engineering team, DUFEW delivers stable production capacity, fast lead times, and professional technical support throughout your project.
A: A Tubular Resistor is a type of wirewound resistor that uses a ceramic tube as its insulating core. Compared with flat or plate-type designs, the tubular structure offers better heat dissipation, higher power density, improved mechanical strength, and greater flexibility for adjustable or multi-terminal configurations.
A: Yes. DUFEW provides complete OEM and ODM customization services, including resistance values, power ratings, dimensions, resistance wire materials, terminal types, mounting brackets, adjustable structures, and multi-terminal configurations based on your drawings or application requirements.
A: The standard version features an IP00 open-type construction and is intended for installation inside electrical cabinets or equipment. For high-humidity or harsh operating environments, we recommend selecting a glass-enamel coated or specially protected version, or using appropriate enclosure and moisture-proof measures.
A: The replacement should match the original resistance value, power rating, operating voltage, and installation dimensions. If the original model is unavailable, DUFEW can recommend an equivalent or upgraded solution based on your application to ensure safe and reliable operation.
A: Fixed models are ideal for equipment with stable resistance requirements, while adjustable versions are better suited for commissioning, testing, load simulation, and applications that require resistance adjustment during operation.
A: It is widely used in motor drives, inverter braking systems, welding equipment, load banks, power testing equipment, industrial automation, electrical control panels, battery discharge systems, renewable energy equipment, railway systems, and other heavy-duty industrial applications.
DUFEW manufactures high-quality Tubular Resistors for industrial power control, braking systems, load testing, and energy dissipation applications. Whether you require a standard product or a fully customized solution, our engineering team is ready to provide professional technical support and fast quotations.
- OEM & ODM Manufacturing
- Custom Resistance Values
- Power Ratings from 50W to 10kW
- Adjustable & Multi-Terminal Designs
- Custom Dimensions & Mounting Solutions
- Engineering Selection Support
- Stable Bulk Production
- Worldwide Delivery
Contact DUFEW today to discuss your application requirements and receive a customized quotation.
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No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
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