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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 Electric Load Reactor is installed in series between VFD output terminals (U/V/W) and motor loads to improve load-side stability and maintain reliable operation in long-distance motor drive systems.
In variable frequency drive applications, high-frequency switching signals generated by inverter power devices pass through motor cables. When cable distance increases, distributed capacitance may cause additional charging current, current fluctuation, and unstable system performance.
By adding suitable impedance to the output circuit, the reactor helps reduce the influence of cable characteristics, smooth current variation, and improve the reliability of VFD-driven motor systems.
Manufactured with low-loss cold rolled silicon steel cores, Class F insulation materials, vacuum impregnation technology, and optimized winding structures, Dufew Load Reactor provides stable inductance performance, excellent thermal reliability, and long service life under demanding industrial conditions. High-current models can adopt compact foil winding structures to improve heat dissipation and reduce temperature rise.
Long-distance motor installations and variable industrial loads may create electrical challenges, including:
- Increased cable distributed capacitance effects
- Excessive capacitive charging current
- Current fluctuation during operation
- Inverter over-current protection trips
- Reduced motor drive stability
- Electromagnetic interference in control systems
A properly selected Load Reactor helps optimize load-side electrical characteristics, improve system stability, and reduce unexpected downtime in industrial applications.
When motors are installed far from VFD cabinets, cable characteristics can influence electrical performance and increase stress on the drive system. Dufew Load Reactor helps reduce the effect of distributed cable capacitance and limit capacitive charging current, supporting more stable long-distance transmission and reliable operation of remotely installed motors.
Industrial equipment often operates with variable loads and frequent acceleration or deceleration. The optimized reactor design helps smooth current fluctuations and maintain more consistent motor operation, reducing abnormal operating conditions and supporting stable performance under dynamic loads.
High-frequency disturbances generated during VFD operation can affect motors as well as nearby control and automation equipment. The load-side filtering effect helps reduce high-frequency harmonic components and electromagnetic interference, while also contributing to lower motor operating noise and vibration.
It uses a low-loss cold rolled silicon steel core, Class F insulation system, vacuum impregnation, and high-temperature curing. Copper or aluminum winding options are available according to application requirements. This combination provides stable inductance, controlled vibration, and reliable thermal performance for long-term industrial operation.
The three-phase symmetrical core structure provides balanced magnetic performance and stable inductance characteristics while helping reduce magnetic loss. This optimized arrangement supports consistent electrical performance and reliable operation during continuous use.
Different installation configurations are available to accommodate various cabinet and equipment layouts, including IP00 open structures, IP20 protective enclosures, vertical installation, and horizontal installation. Customized dimensions can also be provided according to available cabinet space, equipment structure, and specific project requirements.
Dufew Load Reactor solutions are widely used in:
| Application Field | Customer Requirement |
|---|---|
| Long-distance motor drive systems | Reduce cable effects and improve transmission stability |
| Industrial testing equipment | Improve output current stability and measurement reliability |
| Port cranes and lifting equipment | Maintain reliable operation under frequent load changes |
| Elevator drive systems | Improve drive stability during acceleration and deceleration |
| Pumps and fan systems | Enhance continuous operating performance |
| Rolling mills and mining equipment | Support heavy-duty industrial applications |
| Servo drive systems | Improve electrical stability in automation equipment |
| Application Condition | Recommendation |
|---|---|
| Motor cable distance exceeds 50 meters | Recommended |
| Cable distributed capacitance affects operation | Recommended |
| Inverter over-current faults occur frequently | Recommended |
| Motor load changes frequently | Recommended |
| High-frequency interference affects equipment | Recommended |
| Continuous heavy-duty operation is required | Recommended |
Proper selection should consider the VFD parameters, cable conditions, and motor load requirements. These factors help determine the appropriate electrical specifications and reactor configuration.
Consider the rated voltage, output current, motor power, and operating frequency. These parameters should match the VFD and motor system to ensure stable operation.
Cable length and type are important, especially for motors installed far from the VFD. The installation environment and distributed capacitance should also be considered when selecting the reactor.
Operating conditions, load variation, continuous operation requirements, and the required protection level should be evaluated. Frequent acceleration, deceleration, or variable loads may require a more robust configuration.
Dufew provides customized reactor designs based on application conditions, installation requirements, electrical parameters, and customer specifications.
Example: CAL-4321-0250-EISA
| Code | Description |
|---|---|
| CAL | AC Reactor Series |
| 4 | Voltage Level (2=220V, 4=380V, 6=690V) |
| 3 | Three Phase |
| 2 | Load Reactor Type |
| 1 | Voltage Drop (1%=1%, 2%=2%) |
| 0250 | Rated Current (250A) |
| EI | Core Structure |
| S/W | Installation Structure (Vertical/Horizontal) |
| A/C | Winding Material (Aluminum/Copper) |
| Parameter | Specification |
|---|---|
| Product Type | VFD Load Reactor |
| Installation Position | Between VFD output and motor |
| Rated Voltage | 220VAC / 380VAC / 690VAC / 1140VAC |
| Rated Current | 5A--3800A |
| Frequency | 50Hz / 60Hz / Customized up to 500Hz |
| Voltage Drop | 0.5% / 1% / 2% / 4% |
| Overload Capacity | 1.5 times rated current for 60 seconds |
| Dielectric Strength | 3000VAC / 50Hz / 5mA / 1Min |
| Insulation Resistance | ≥100MΩ (1000VDC) |
| Protection Class | IP00 / IP20 |
| Temperature Class | T40 |
| Insulation Class | Class F (155℃) |
| Flame Retardant Grade | UL94V-2 |
| Noise Level | ≤65dB |
| Service Life | ≥15 years |
| Manufacturing Standards | IEC289 / GB10229 / JB9644 |
Dufew Electric specializes in reactors, resistors, braking systems, transformers, and customized power electronics solutions. Its manufacturing process covers silicon steel core processing, precision winding, vacuum impregnation, high-temperature curing, and electrical performance testing.
Quality control includes insulation resistance, withstand voltage, temperature rise, and electrical performance verification to ensure reliable product performance.
Dufew supports customized electrical design, OEM manufacturing, technical documentation, and application engineering for different industrial requirements.
Dufew products are manufactured according to recognized industrial requirements, including:
- ISO 9001 Quality Management System
- CE Compliance
- IEC289
- GB10229
- JB9644
Dufew provides professional export packaging solutions according to product dimensions, weight, and transportation requirements.
Packaging includes:
- Shock-resistant protection
- Moisture protection for sea transportation
- Export-standard wooden cases
- Pre-shipment inspection records
These measures ensure safe delivery and reliable operation after installation.
| Comparison | Load Reactor | Output Reactor |
|---|---|---|
| Main Purpose | Improve load-side stability and reduce cable effects | Reduce PWM voltage stress on motor insulation |
| Main Concern | Cable capacitance, current fluctuation, system stability | dv/dt stress and voltage spikes |
| Typical Application | Long cable systems, changing loads, heavy-duty equipment | Motor protection and waveform improvement |
| Installation Position | VFD output side | VFD output side |
| Selection Factors | Cable length, load characteristics, system stability | Motor insulation, switching stress, voltage rise rate |
It is commonly used when motor cable distances are long, cable characteristics affect system performance, inverter protection trips occur, or improved electrical stability is required under changing loads.
Both are installed on the VFD output side, but they serve different application purposes. This product mainly improves system stability under long cable conditions, changing loads, and demanding industrial environments, while an Output Reactor focuses more on reducing PWM voltage stress and protecting motor insulation. The final selection depends on cable length, motor characteristics, and operating conditions.
Yes. By reducing high-frequency disturbances and improving current stability, it can help reduce electromagnetic noise and vibration during motor operation.
Yes. Dufew provides customized solutions covering voltage, current, voltage drop, winding material, installation structure, and protection requirements according to specific industrial applications.
Dufew Electric provides reliable solutions for industrial VFD applications, supported by professional manufacturing capabilities, customized engineering services, and strict quality control. From long-distance motor systems to heavy-duty industrial equipment, the solutions are designed to improve system stability and support reliable operation.
Contact Dufew Electric for customized reactor design and OEM cooperation.
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No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
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