English
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 AC Line Reactor is installed between the AC power supply and VFD input terminals to provide controlled impedance, helping stabilize current flow and improve the overall electrical environment.
The reactor helps reduce harmonic current generated by VFD rectifier circuits, limit sudden current changes, protect inverter input components, and improve overall power system reliability.
Modern variable frequency drives (VFDs) use high-speed switching technology to control motor speed and improve energy efficiency. However, the switching process and nonlinear input characteristics may introduce electrical disturbances into the power system.
Without proper input protection, VFD systems may experience harmonic current distortion, input current spikes, voltage fluctuations, electrical interference, and increased stress on inverter components.
These issues may lead to overheating of electrical equipment, reduced inverter service life, damage to DC bus capacitors, unstable motor operation, and unexpected equipment downtime.
VFD input rectifiers can generate harmonic currents that affect the electrical network, especially in facilities operating multiple inverter systems.
It reduces harmonic impact by adding impedance to the input circuit, helping improve power quality and maintain a more stable electrical environment.
Benefits include:
- Reduced harmonic feedback to the power supply
- Improved voltage waveform stability
- Reduced interference between electrical equipment
- Better protection for power capacitors and transformers
For factories with multiple variable speed drives, it helps create a more reliable and stable power system.
During motor startup, acceleration, load changes, or unstable power conditions, excessive current impact may occur and affect inverter components.
The reactor helps reduce electrical stress by limiting input surge current, reducing stress on rectifier bridges, protecting inverter DC bus components, and improving long-term VFD reliability.
It is particularly suitable for industrial power systems with high short-circuit capacity or low impedance transformers.
Industrial environments require electrical components that can operate continuously under changing loads and demanding working conditions.
Dufew Electric AC Line Reactor adopts optimized electromagnetic design and insulation technology to achieve stable inductance performance, lower temperature rise, reduced electromagnetic vibration, and reliable long-term operation.
The reactor uses high-quality cold rolled silicon steel core materials to reduce magnetic losses and maintain stable inductance performance during continuous operation.
This design provides:
- Lower energy loss and improved operating efficiency
- Better thermal performance under continuous load conditions
- Stable electrical characteristics
- Reliable performance for long-term industrial operation
Based on different current requirements, Dufew Electric provides optimized winding structures to ensure reliable electrical performance in various industrial applications.
The winding design features:
- Copper or aluminum winding options for different application needs
- High-current conductor design to support demanding operating conditions
- Improved heat dissipation performance
- Reduced winding temperature rise during operation
This optimized structure allows the reactor to meet different industrial current requirements while maintaining stable and efficient operation.
The winding assembly is processed through vacuum impregnation and high-temperature curing, improving insulation performance and enhancing overall mechanical strength.
The process improves:
- Insulation strength for safer operation
- Mechanical stability under vibration conditions
- Resistance to vibration and environmental impact
- Long-term operating durability
This manufacturing process helps maintain reliable performance and extended service life in industrial environments.
Selecting the correct AC Line Reactor requires matching the reactor parameters with the VFD system.
Dufew Electric evaluates the following factors:
| Selection Parameter | Design Consideration |
|---|---|
| VFD Voltage | Determines insulation level and reactor configuration |
| Rated Current | Determines conductor size and thermal design |
| Motor Power | Influences reactor capacity selection |
| Voltage Drop | Determines impedance requirements |
| Operating Frequency | Affects electromagnetic design |
| Installation Environment | Determines protection and mounting structure |
Before quotation, customers should provide:
- VFD rated power
- Input voltage
- Rated current
- Required voltage drop
- Installation conditions
- Operating environment
| Item | AC Line Reactor | Output Reactor |
|---|---|---|
| Installation Position | Between power supply and VFD input | Between VFD output and motor |
| Main Function | Reduce input harmonics and surge current | Protect motor insulation and reduce output waveform stress |
| Main Application | Power quality improvement | Long cable motor protection |
| Typical Users | Industrial VFD systems | Motors with long-distance cable connections |
Dufew Electric provides both input and output reactor solutions according to system requirements.
Different industrial systems require different electrical configurations and installation methods. Dufew Electric provides customized reactor solutions based on application requirements, helping customers achieve reliable performance and seamless integration into various industrial control systems.
The reactor can be customized according to key electrical parameters, including rated voltage, rated current, voltage drop percentage, and operating frequency, to meet different power system requirements.
To adapt to different cabinet layouts and installation environments, Dufew reactors support multiple installation options, including cabinet installation, standalone installation, vertical mounting, and horizontal mounting.
According to specific application conditions and current requirements, customers can choose suitable winding materials, including copper winding or aluminum winding.
With flexible configuration options and customized designs, Dufew reactors can be integrated into different industrial control systems while maintaining stable and reliable operation.
Dufew Electric AC Line Reactor is widely used in industrial systems requiring improved VFD power quality and electrical protection.
| Application | Typical Equipment | Main Benefits |
|---|---|---|
| Industrial Automation | CNC machines, production lines, servo systems | Improved electrical stability |
| Motor Drive Systems | Pumps, fans, compressors, conveyors | Reduced inverter stress |
| Heavy Equipment | Cranes, elevators, hoisting systems | Reliable operation under changing loads |
| Manufacturing Industry | Rolling mills, processing equipment | Improved power quality |
| Renewable Energy Systems | Inverter systems, energy storage equipment | Stable power conversion |
| Parameter | Specification |
|---|---|
| Product Type | AC Line Reactor |
| Rated Voltage | 220VAC / 380VAC / 690VAC / 1140VAC |
| Working Frequency | 50Hz / 60Hz / Up to 500Hz |
| Rated Current | 5A - 3800A |
| Voltage Drop | 0.5% / 1% / 2% / 4% |
| Overload Capability | 1.5 times rated current for 60 seconds |
| Dielectric Strength | 3000VAC / 50Hz / 5mA / 1Min |
| Insulation Resistance | ≥100MΩ (1000VDC) |
| Protection Grade | IP00 / IP20 |
| Insulation Class | T40/F (155℃) |
| Flame Retardant Grade | UL94V-2 |
| Noise Level | ≤65dB |
| Service Life | ≥15 years |
| Standards | IEC289:1987 / GB10229-88 / JB9644-1999 |
Example: CAL-4312-0250-EISA
| Code | Description |
|---|---|
| CAL | AC Line Reactor |
| 4 | Voltage Level (2=220V, 4=380V, 6=690V) |
| 3 | Phase Number |
| 1 | Reactor Type |
| 2 | Voltage Drop |
| 0250 | Rated Current |
| EI | Core Structure |
| S | Installation Structure |
| A | Winding Material |
Before delivery, Dufew Electric performs electrical and structural inspections to ensure reliable operation.
Testing includes:
| Test Item | Requirement |
|---|---|
| Insulation Resistance Test | ≥100MΩ |
| Dielectric Strength Test | 3000VAC |
| Temperature Rise Test | According to rated load |
| Electrical Parameter Verification | Inductance and current confirmation |
| Appearance Inspection | Core, winding, terminals inspection |
Dufew Electric specializes in power electronics components and customized electrical solutions, providing reliable AC Line Reactors for various industrial applications.
With integrated manufacturing capabilities, Dufew manages key production processes from core processing and coil manufacturing to final assembly and quality inspection.
The manufacturing process includes silicon steel cutting, core assembly, and magnetic performance inspection to ensure stable electromagnetic characteristics.
Dufew provides copper and aluminum winding options with professional insulation treatment and vacuum impregnation processes to improve product reliability and durability.
Final production includes terminal installation, electrical testing, and quality inspection to ensure each reactor meets required performance standards.
This integrated manufacturing capability enables Dufew Electric to provide both standard AC Line Reactors and customized solutions for different industrial applications.
Dufew Electric follows structured quality management procedures to ensure consistent product performance and reliable operation throughout the service life.
Available quality documents include:
- ISO Quality Management System Certification
- CE Certification
- Product Testing Reports
Technical documents and inspection records can be provided according to customer project requirements.
AC Line Reactors require protection against moisture, vibration, and mechanical impact during transportation.
Dufew Electric provides:
- Export-standard packaging
- Moisture protection
- Reinforced internal fixing
- Product identification labels
Before shipment, engineers confirm:
- Product specification
- Weight and dimensions
- Installation requirements
- Delivery requirements
Select the appropriate reactor according to the VFD power rating, input voltage, rated current, and required voltage drop to ensure compatibility with the application system.
Before installation, check the product condition carefully, including the core condition, winding appearance, and terminal connections to ensure the reactor is ready for operation.
The standard connection method is:
Power Supply → AC Line Reactor → VFD Input
The reactor should be installed in a well-ventilated area with sufficient space for heat dissipation and future maintenance.
During electrical connection, ensure correct wiring, secure terminal connections, and proper grounding to maintain safe and reliable operation.
After installation, perform an operation test by checking operating noise, monitoring temperature rise, and verifying overall system performance.
An AC Line Reactor is installed on the input side of a variable frequency drive (VFD) to reduce harmonic distortion, limit current surges, improve power quality, and protect inverter components from electrical stress.
Not every VFD application requires an input reactor. It is recommended for systems with harmonic problems, unstable power supply, frequent current fluctuations, multiple inverter operation, or sensitive electrical equipment.
The suitable voltage drop depends on system power quality requirements, harmonic conditions, input characteristics, and operating environment. Dufew Electric evaluates application parameters and recommends a suitable configuration.
Yes. By reducing current impact and electrical stress on the VFD input side, it helps improve system stability and extend the service life of inverter components.
Yes. Dufew Electric provides customized solutions according to voltage, current, frequency, installation structure, winding material, and other project requirements.
Customers should provide:
- VFD power rating
- Input voltage
- Rated current
- Required voltage drop
- Installation environment
- Operating conditions
Dufew Electric provides customized AC Line Reactor solutions for industrial customers requiring improved VFD protection, harmonic control, and power quality management.
With professional manufacturing capabilities, engineering support, and complete testing procedures, Dufew Electric helps customers develop reliable solutions for industrial drive systems.
Send your VFD parameters and application requirements to Dufew Electric, and our engineers will recommend a suitable configuration based on your operating conditions.
Address
No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
Tel
