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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 Output Reactor is installed between the VFD output terminals and motor to improve power transmission quality and protect motor systems from high-frequency switching stress.
The rapid switching characteristics of PWM output voltage from VFDs may generate high dv/dt stress, reflected voltage waves, harmonic currents, and additional cable charging current. These effects become more serious when long cables are used between the inverter and motor.
By adding proper impedance to the output circuit, the reactor helps smooth voltage waveforms, reduce motor terminal voltage spikes, lower insulation stress, and improve the reliability of industrial drive systems.
Dufew reactors use low-loss silicon steel cores, high-temperature insulation materials, and optimized winding structures to ensure stable performance under continuous industrial operation.
When the cable between the inverter and motor is too long, the distributed capacitance of the cable generates additional charging current.
Without proper protection, this may cause:
- VFD overcurrent alarms
- Unstable motor operation
- Increased inverter output stress
- Reduced system reliability
The VFD Output Reactor reduces capacitive charging current and improves system stability, especially for applications where the motor is installed far away from the inverter cabinet.
The reactor reduces the impact of high-frequency PWM voltage changes generated by the VFD, helping protect motor insulation during continuous operation.
It lowers voltage stress on motor windings, reduces insulation aging, and extends motor service life. This helps improve overall system reliability, especially in demanding industrial applications.
When motors are installed far from VFD cabinets, long cables can increase charging current and cause reflected voltage effects.
The reactor helps reduce these impacts by improving current waveform quality and limiting voltage fluctuations. It supports longer cable transmission distances while maintaining stable motor operation.
The optimized inductive design helps suppress high-frequency harmonic components generated during VFD operation.
It also reduces motor electromagnetic noise, leakage current, and potential interference with nearby automation and control equipment, creating a more stable operating environment.
The reactor is manufactured with a cold rolled silicon steel core, Class F insulation system, vacuum impregnation process, and copper or aluminum winding options.
This robust construction ensures stable inductance, reduced vibration, and reliable thermal performance for long-term industrial operation.
The symmetrical three-phase core structure provides balanced magnetic performance across all windings.
It helps reduce magnetic losses while maintaining stable inductance characteristics, ensuring consistent electrical performance during VFD operation.
The reactor is available in different configurations, including IP00 open structures and IP20 protection enclosures, to meet various installation requirements.
It supports both vertical and horizontal installation methods. Customized dimensions are available to match cabinet space, mounting conditions, and specific application needs.
Dufew reactor solutions are widely used in industrial applications where motor protection and stable VFD operation are required.
Typical applications include:
- Variable frequency drive systems for improving power stability and reducing electrical stress on motors.
- Industrial motor control cabinets, pumps, and fans requiring reliable continuous operation.
- Cranes and lifting equipment, mining machinery, and port equipment used in demanding working conditions.
- Rolling mills, injection molding machines, and textile machinery for stable and efficient production processes.
- Automated production lines and renewable energy equipment where reliable power performance is important.
| Application Condition | Recommendation |
|---|---|
| Motor cable length exceeds 50 meters | Recommended |
| Motor insulation protection required | Recommended |
| Motor noise needs reduction | Recommended |
| High-frequency interference affects sensors | Recommended |
| Frequent acceleration and deceleration | Recommended |
Reactor selection should be based on VFD parameters, cable conditions, and motor requirements to ensure proper performance and reliable operation.
Selection should consider key factors such as:
- Rated voltage and output current
- Motor power and operating frequency
Cable characteristics and installation conditions also affect reactor selection, including:
- Cable length and cable type
- Installation environment
- Distributed capacitance
Motor insulation and operating conditions should be evaluated to match the appropriate reactor solution, including:
- Insulation class
- Operating condition
- Protection requirements
Dufew provides customized reactor designs according to different industrial applications and system requirements.
CAL-4321-0250-EISA
| Code | Description |
|---|---|
| CAL | AC Reactor Series |
| 4 | Voltage Level |
| 3 | Three Phase |
| 2 | Output Reactor Type |
| 1 | Voltage Drop |
| 0250 | Rated Current |
| EI | Core Structure |
| S | Installation Type |
| A | Aluminum Winding |
| Parameter | Specification |
|---|---|
| Product Type | VFD Output Reactor |
| Rated Voltage | 220VAC / 380VAC / 690VAC / 1140VAC |
| Frequency | 50Hz / 60Hz |
| Rated Current | 5A - 3800A |
| Voltage Drop | 0.5% / 1% / 2% / 4% |
| Overload Capacity | 1.5 times rated current for 60 seconds |
| Dielectric Strength | 3000VAC / 50Hz / 1Min |
| Insulation Resistance | ≥100MΩ |
| Protection Grade | IP00 / IP20 |
| Insulation Class | Class F (155℃) |
| Noise Level | ≤65dB |
| Service Life | ≥15 years |
Dufew Electric specializes in industrial power components and customized reactor solutions.
Each Output Reactor is manufactured with controlled processes including:
- Core manufacturing inspection
- Winding process control
- High voltage withstand testing
- Insulation resistance testing
- Temperature rise inspection
- Electrical performance verification
Products can be supplied with:
- ISO quality management system compliance
- CE certified products
- Customized technical documentation
Before shipment, each reactor is inspected according to customer specifications to ensure reliable installation and operation.
Industrial reactors require reliable protection during international transportation due to their weight and electromagnetic components.
Dufew provides:
| Transportation Method | Application |
|---|---|
| Sea Freight | Large industrial orders and complete equipment projects |
| Air Freight | Sample and urgent delivery requirements |
| Land Transportation | Regional industrial delivery |
Packaging features:
- Moisture-resistant protection
- Shock-proof fixing
- Export standard wooden cases
- Customized packaging according to product size and weight
It is installed between the VFD output terminals and the motor to improve output waveform quality and reduce electrical stress on the motor side.
It is commonly used for long cable applications, motor insulation protection, and systems affected by voltage spikes, noise, or interference.
No. Input-side and motor-side components have different functions. One focuses on power supply protection, while the other improves motor-side performance.
Yes. Dufew provides customized solutions based on voltage, current, installation requirements, and operating environment.
Dufew Electric provides reliable reactor solutions for industrial VFD applications with professional manufacturing capability, customized engineering support, and strict quality control.
From motor protection to long-distance drive applications, Dufew helps customers improve equipment reliability, reduce maintenance costs, and achieve stable operation.
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No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
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