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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.
Inverter Braking Resistor Box is a dedicated braking component used in inverter-driven motor systems. When a motor decelerates with a large inertia load, regenerative energy is fed back to the inverter DC link, causing the bus voltage to rise. This product dissipates the excess energy through resistor elements to maintain stable inverter operation.
The internal structure consists of multiple corrugated resistor elements arranged according to required resistance and power ratings. The resistor assembly is installed inside a protective aluminum-zinc coated steel enclosure with integrated terminal blocks and temperature protection switches.
The enclosure design supports external mounting beside the inverter cabinet, helping save internal cabinet space while maintaining effective heat dissipation and electrical safety.
The resistance and power configuration are designed according to common inverter braking requirements. This simplifies selection and helps reduce manual calculation during system integration.
The enclosure adopts a side ventilation design that directs hot air away from the inverter cabinet, reducing secondary heat accumulation around drive components.
The internal layout provides sufficient insulation distance between resistor elements and the enclosure, supporting stable operation under DC bus voltages up to 1200V.
The dedicated mounting base allows installation on the side or bottom of inverter cabinets without occupying valuable internal electrical cabinet space.
- Designed specifically for VFD regenerative braking systems
- Converts excess braking energy into heat to prevent DC bus overvoltage alarms
- Corrugated resistor combination supports power ratings up to 30kW
- Built-in temperature switch improves operation safety
- Aluminum-zinc coated enclosure provides corrosion resistance and mechanical protection
- Suitable for frequent acceleration, deceleration, and emergency stop conditions
Dufew Electric Corrugated Resistor Cabinet is designed for industrial drive systems that require reliable energy dissipation during braking, deceleration, and dynamic load control. Its flexible configuration makes it suitable for various heavy-duty applications, including:
The resistor cabinet helps manage regenerative energy generated during frequent lifting and lowering operations, improving system stability in elevators, tower cranes, hoists, winches, and lifting platforms.
For equipment with frequent acceleration and deceleration cycles, such as belt conveyors, stacker reclaimers, and heavy transport systems, the solution provides stable braking performance and supports continuous industrial operation.
The cabinet is suitable for industrial machinery requiring precise motor control and energy absorption, including rolling mills, centrifuges, injection molding machines, wire drawing machines, and textile machinery.
It can also be integrated into inverter performance testing equipment and servo drive test systems to provide controlled resistance loads for evaluating electrical performance and system reliability.
| 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 |
| Standard | GB-5792 |
Example: CRB 10KW 13.6R J
| Code | Description |
|---|---|
| CRB | Braking Resistor Box |
| 10KW | Rated Power |
| 13.6R | Rated Resistance |
| J | Resistance Tolerance (K=10%, J=5%, H=3%) |
| Performance Item | Test Condition | Performance |
|---|---|---|
| Dielectric Strength | 2500VAC/50Hz/60S | Leakage current ≤10mA |
| Insulation Resistance | 1000VDC | ≥100MΩ |
| Short-Time Overload | 10 times rated power 5S | No visible damage |
| Long-Term Load Life | 10S discharge / 90S interval cycling | >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 discoloration or damage |
| Temperature Coefficient | Rated load condition | <300 ppm/℃ |
| Flame Test | 10 times rated power 5min | Red heating without flame |
| Performance Item | Test Condition | Performance |
|---|---|---|
| Terminal Strength | 45N/30S | No looseness or damage |
| Vibration Resistance | 5-200Hz, 1g, 98m/S² | No structural damage |
| Soldering Heat Resistance | 350±5℃ / 3S | △R≤±(1%R+0.05Ω) |
| Solderability | 235±5℃ / 5S | Solder coverage >95% |
During rapid deceleration or emergency braking, this product provides an effective energy dissipation path to help maintain inverter DC bus stability.
The resistor structure is designed for repeated energy absorption conditions commonly found in lifting equipment, conveyors, and industrial automation systems.
The external mounting structure reduces cabinet space requirements and simplifies system installation.
| Comparison Item | Inverter Braking Resistor Box | General Load Resistor Box |
|---|---|---|
| Main Purpose | Designed for inverter braking and DC bus voltage control | General resistance load applications |
| Parameter Selection | Matched with inverter braking unit requirements | Requires additional resistance calculation |
| Cooling Design | Side exhaust prevents hot air entering inverter cabinet | Standard airflow may affect surrounding equipment |
| Installation | Supports inverter cabinet external mounting | Usually requires separate installation space |
| Working Condition | Optimized for intermittent regenerative braking | Mainly used for general load or testing |
Dufew Electric applies standardized production procedures from resistor assembly and enclosure fabrication to electrical performance testing.
Quality control includes:
- Incoming material inspection
- Resistance value verification
- Insulation testing
- Thermal protection testing
- Final product inspection
Each resistor box is professionally packaged according to product size and transportation requirements.
Packaging process includes:
- Product protection fixing
- Moisture-resistant packaging
- Export shipment preparation
- Batch order management
Selecting a suitable Inverter Braking Resistor Box requires a comprehensive evaluation of inverter parameters, motor characteristics, braking conditions, and installation environment. The correct configuration helps effectively dissipate regenerative energy, prevent DC bus overvoltage, and improve the long-term reliability of VFD systems.
The resistor box power rating should be selected according to the inverter capacity and motor operating conditions. Applications with higher motor power, larger load inertia, or frequent braking cycles generally require stronger energy absorption capability.
Key selection factors include inverter rated power, motor power, load inertia, required braking torque, and braking frequency.
The working voltage of the resistor must match the inverter DC bus voltage to ensure safe and stable operation. Different drive systems may require different voltage configurations, such as 400V class inverter systems, 690V industrial drives, or high-voltage DC applications up to 1200V.
Dufew braking resistor solutions are designed to support stable operation under different DC bus voltage conditions according to application requirements.
The resistance value directly influences braking performance. A lower resistance value can provide stronger braking force but results in higher current flow, while a higher resistance value reduces current stress but may increase braking time.
The suitable resistance configuration should be determined according to inverter braking unit specifications, allowable braking current, required stopping time, and load inertia characteristics.
Different industrial applications generate different levels of regenerative energy, so the resistor box must be selected according to the actual braking cycle and operating conditions.
| Application | Operating Condition | Selection Focus |
|---|---|---|
| Elevator | Frequent acceleration and stopping cycles | High reliability and repeated braking capability |
| Crane & Hoist | Heavy lifting and lowering operations | High overload capacity and stable performance |
| Conveyor System | Long continuous operation | Stable thermal management |
| Centrifuge | Rapid deceleration requirements | Fast energy absorption capability |
| Industrial Machinery | Intermittent braking conditions | Proper power and resistance selection |
The installation environment affects cabinet structure, ventilation design, and thermal performance. Before selection, customers should consider available mounting space, installation method, ambient temperature, and airflow conditions.
Dufew braking resistor boxes adopt practical installation structures and optimized ventilation designs, allowing integration with inverter cabinets while maintaining effective heat dissipation.
Standard resistor boxes may not always satisfy specific industrial requirements. Dufew provides customized configurations based on resistance value, rated power, working voltage, enclosure dimensions, terminal arrangement, and protection requirements.
With professional manufacturing capability, Dufew Electric supports OEM and customized braking resistor solutions for different inverter systems and industrial applications.
Dufew braking resistor boxes can be matched with various inverter systems from different manufacturers. Customers can provide inverter model information, and Dufew will recommend a suitable resistance and power configuration.
For customization, customers should provide inverter model, motor power, working voltage, resistance value, braking duty cycle, and installation requirements. Dufew can design a suitable resistor box solution according to these parameters.
Yes. Dufew provides customized braking resistor boxes with adjustable resistance values, power ratings, enclosure designs, terminal configurations, and protection options to meet different industrial applications.
Service life is mainly affected by braking frequency, overload conditions, operating temperature, cooling performance, and installation environment. Proper selection and heat management can improve long-term reliability.
Yes. Dufew braking resistor boxes are designed for applications requiring repeated acceleration and deceleration, such as elevators, cranes, conveyors, and industrial automation equipment. The power rating should be selected according to the braking cycle.
Regular inspection is recommended to check ventilation conditions, terminal connections, dust accumulation, and signs of overheating. Proper maintenance helps ensure stable performance and longer service life.
Dufew braking resistor boxes feature protective enclosures and reliable structures for industrial applications. Customized protection solutions are available for environments with high humidity, dust, or special operating conditions.
Dufew specializes in industrial resistor design and manufacturing, providing customized braking resistor solutions, strict quality inspection, and reliable support for inverter manufacturers, equipment builders, and automation companies.
Need a braking resistor solution for elevators, cranes, industrial drives, or automation equipment?
Provide your inverter model, motor power, DC bus voltage, and braking requirements. Dufew will recommend a suitable VFD braking resistor box and provide technical support for your project.
Request a quotation today for customized resistance values, power ratings, and enclosure designs.
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No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
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