English
We offer a comprehensive portfolio including resistors, braking units, reactors, power filters, and transformers, with full customization options to meet diverse application requirements.
Tubular Resistor Box is a high-performance resistor assembly designed to absorb and dissipate excess electrical energy generated during motor deceleration, emergency stop, or load testing processes. It is widely used in industrial drive systems, power electronics equipment, and energy management applications.
Manufactured by Dufew Electric, the resistor box adopts sealed stainless steel tubular resistor elements with nickel-chromium alloy resistance wires precisely wound inside. The internal structure is filled with high-density magnesium oxide (MgO) insulation material, which provides excellent electrical insulation and efficient heat transfer.
Compared with traditional open-type wire wound resistors or conventional resistor boxes, the tubular design offers better protection against dust, moisture, oil contamination, and mechanical impact, making it suitable for demanding industrial environments.
Each tubular resistor element supports a power range from 50W to 3000W. Multiple elements can be connected in series or parallel to achieve customized power ratings up to 30kW, with resistance values available from 0.01Ω to 1kΩ.
Each resistor tube is independently sealed with a stainless steel outer shell and filled with magnesium oxide insulation material. The fully enclosed structure prevents moisture, dust, and oil from reaching the resistance wire, improving long-term stability and service life.
The tubular elements are arranged horizontally with sufficient spacing between each tube. This design improves airflow circulation and allows heat to transfer evenly through the metal surface, reducing localized overheating during continuous operation.
The resistor box combines stainless steel tubular elements with a protective metal enclosure to improve resistance against corrosion, industrial dust, and harsh operating environments. It is suitable for applications in workshops, outdoor installations, and industrial sites with high humidity or chemical exposure.
Each tubular resistor element is mounted independently, allowing individual replacement without removing the complete resistor box. This reduces maintenance time and minimizes equipment downtime.
- Fully sealed tubular structure: Protects internal resistance elements from moisture, dust, oil, and industrial contaminants.
- High thermal conductivity: Magnesium oxide filling provides efficient heat transfer and stable temperature performance.
- Strong mechanical durability: Stainless steel construction offers excellent vibration resistance and impact protection.
- Flexible configuration: Supports customized resistance values, power ratings, and installation structures.
- Stable performance under frequent operation: Suitable for repeated braking and energy absorption cycles.
- Space-saving design: Compact structure allows flexible installation inside electrical cabinets or equipment systems.
Tubular Resistor Box is widely applied in industrial systems that require effective energy dissipation and braking control, including frequency converter braking systems, servo drive energy consumption circuits, elevator and lifting equipment, cranes, and other heavy-duty machinery.
It is also suitable for CNC machine tools, conveyor systems, injection molding machines, packaging machinery, wind power and renewable energy equipment, battery charging and discharge testing systems, as well as industrial load testing applications.
| Parameter | Specification |
|---|---|
| Power Range | 1kW-30kW |
| Working Voltage | ≤1200V |
| Resistance Range | 0.01Ω-1kΩ |
| Resistance Tolerance | ±3%, ±5%, ±10% |
| Protection Grade | IP20 / IP23 |
| Temperature Coefficient | ≤300 ppm/℃ |
| Flame Retardant Grade | UL94V-2 |
| Insulation Material | High-density Magnesium Oxide |
| Resistance Wire Material | Nickel-Chromium Alloy |
| Standard | GB-5792 |
| Performance Item | Test Condition | Requirement |
|---|---|---|
| Dielectric Strength | 2500VAC, 50Hz/60S | Leakage current ≤10mA |
| Insulation Resistance | 1000VDC | ≥100MΩ |
| Short-Time Overload | 10 times rated power, 5S | No visible damage |
| Continuous Load Life | Cyclic operation | >9000h |
| Damp Heat Test | 40℃±2℃, 90%-95%RH, 100h | △R≤±(1%R+0.05Ω) |
| Temperature Cycling | -55℃/55℃/155℃ cycling | △R≤±(2%R+0.05Ω) |
| Heat Resistance | 350℃/2h | No obvious damage |
| Temperature Coefficient | Rated load condition | <300 ppm/℃ |
| Performance Item | Test Condition | Requirement |
|---|---|---|
| Terminal Strength | 45N/30S | No looseness or damage |
| Vibration Resistance | 5-200Hz, 1g | No structural damage |
| Soldering Heat Resistance | 350±5℃, 3S | No visible damage |
| Solderability | 235±5℃, 5S | Solder coverage >95% |
Dufew Electric provides customized Tubular Resistor Box solutions based on different industrial application requirements, including rated power, resistance value, voltage conditions, number of resistor tubes, connection methods, enclosure dimensions, installation structure, and protection level.
Multiple tubular resistor elements can be configured through series or parallel connections to achieve different braking performance and load testing requirements, allowing the product to adapt to various operating conditions.
| Comparison Item | Tubular Resistor Box | Traditional Aluminum / Corrugated Resistor Box |
|---|---|---|
| Internal Protection | Fully sealed stainless steel tube with MgO filling | Some structures have exposed or less protected resistance elements |
| Moisture & Dust Resistance | Excellent sealing performance against water, dust, and oil | More vulnerable in harsh environments |
| Mechanical Strength | Strong tubular metal structure with high vibration resistance | Thin enclosure or ceramic structures may be more fragile |
| Maintenance | Individual tubular elements can be replaced separately | Maintenance may require larger component replacement |
| Industrial Adaptability | Suitable for humid, dusty, and heavy-duty environments | Mainly used in standard operating conditions |
Tubular Resistor Box uses sealed stainless steel tubular resistor elements filled with high-density magnesium oxide insulation material. This structure provides better protection against moisture, dust, oil contamination, and mechanical stress compared with traditional open-type wire wound or corrugated resistor designs.
This product is commonly used for energy absorption in frequency converters, servo drives, elevators, cranes, CNC machines, and other equipment with frequent acceleration and deceleration. It is also suitable for industrial load testing, battery discharge testing, and power control systems.
Yes. Dufew supports customization of resistance values, rated power, voltage requirements, enclosure dimensions, connection methods, and installation structures according to different industrial applications.
Yes. The modular tubular element design allows a single damaged resistor tube to be removed and replaced without changing the complete assembly, helping reduce maintenance costs and equipment downtime.
Yes. The sealed metal tube structure offers excellent resistance to moisture, dust, vibration, and oil contamination. It can operate reliably in industrial workshops, outdoor equipment, and other demanding environments.
Address
No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
Tel
