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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.
Industrial variable frequency drives (VFDs) are highly sensitive to power quality issues, including voltage fluctuations, electrical surges, and harmonic interference generated by rectifier circuits. When multiple drives operate on the same power system, excessive harmonic current and transient disturbances may lead to inverter faults, DC bus capacitor damage, abnormal alarms, or unexpected system shutdowns.
Dufew Electric Input Line Reactor solutions are installed in series between the AC power source and the VFD input side. By adding controlled impedance to the power circuit, the reactor limits harmonic current, reduces startup inrush current, improves voltage stability, and extends the service life of inverter components.
The reactor uses low-loss cold rolled silicon steel cores, high-temperature insulation materials, and optimized winding structures to ensure reliable operation under continuous industrial conditions. For high-current applications, foil winding technology is available to achieve compact design, improved heat dissipation, and stable electrical performance.
Many VFD failures are caused by poor power quality rather than inverter defects. Installing an Input Line Reactor helps protect drive systems from electrical disturbances and improves overall equipment reliability.
Common issues solved include:
- High input current surge during VFD startup
- Harmonic pollution caused by diode rectification
- Three-phase voltage imbalance
- Frequent inverter over-voltage alarms
- DC bus capacitor and rectifier bridge damage
- Interference between multiple VFD systems
Dufew Input Line Reactor reduces harmonic current generated by VFD rectifier circuits and helps minimize harmonic feedback into the industrial power network.
It improves power quality by reducing waveform distortion, enhancing the compatibility of multiple VFD systems, and providing better protection for power factor correction capacitors and sensitive control equipment.
During VFD startup, acceleration, or sudden load changes, electrical surges and current fluctuations may affect system stability.
The reactor helps reduce startup inrush current, limit transient impact current, protect inverter rectifier components, and reduce DC bus over-voltage risks for improved system reliability.
Dufew reactors are manufactured with reliable materials and professional production processes, including low-loss cold rolled silicon steel cores, Class F insulation materials, vacuum impregnation process, and high-temperature curing technology.
Copper or aluminum winding options are available to meet different application requirements. The optimized magnetic structure helps reduce vibration, noise, and temperature rise during long-term operation.
As a professional industrial power component manufacturer, Dufew provides customized reactor solutions based on different application requirements and operating conditions.
Customization options include:
- Rated voltage and rated current
- Voltage drop and VFD power rating
- Installation dimensions and operating environment
- Winding material
Available structures include:
- IP00 open structure
- IP20 protected enclosure
- Vertical or horizontal installation
- Copper winding or aluminum winding
Dufew Input Line Reactor solutions are widely used in industrial applications requiring improved power quality, inverter protection, and stable electrical performance.
Typical applications include:
- Variable Frequency Drive (VFD) systems and industrial motor control cabinets
- Servo drive systems, elevators, and lifting equipment
- Cranes and port machinery operating under demanding load conditions
- Rolling mills, pumps, and fans requiring reliable continuous operation
- Injection molding machines and industrial automation equipment
- Renewable energy conversion systems with high power quality requirements
An Input Line Reactor is recommended for applications with:
| Application Condition | Recommendation |
|---|---|
| Multiple VFDs sharing one power supply | Recommended |
| Power supply capacity ≥600kVA | Recommended |
| VFD installed close to large-capacity transformer | Recommended |
| Three-phase voltage imbalance exceeds 1.8% | Recommended |
| Power system with harmonic interference | Recommended |
| Frequently switched power factor correction capacitors | Recommended |
Dufew model numbers provide information about voltage level, phase type, reactor type, voltage drop, rated current, core structure, installation method, and winding material.
| Code | Description |
|---|---|
| CAL | AC Reactor Series |
| 4 | Voltage Level (2=220V, 4=380V, 6=690V) |
| 3 | Phase Number (3=Three Phase, 1=Single Phase) |
| 1 | Reactor Type (1=Input Reactor, 2=Output Reactor) |
| 2 | Voltage Drop (2=2%, 1=1%) |
| 0250 | Rated Current (0250=250A, 2500=2500A) |
| EI | Core Structure (EI=Three Phase Core, UI=Single Phase Core) |
| S | Installation Type (S=Vertical, W=Horizontal) |
| A | Winding Material (A=Aluminum, C=Copper) |
Example: CAL-4312-0250-EISA
380V three-phase Input Line Reactor with 2% voltage drop, 250A rated current, EI core structure, vertical installation, and aluminum winding.
| Parameter | Specification |
|---|---|
| Rated Voltage | 220VAC / 380VAC / 690VAC / 1140VAC |
| Frequency | 50Hz / 60Hz / Customized frequency available |
| Rated Current | 5A - 3800A |
| Voltage Drop | 0.5% / 1% / 2% / 4% |
| Overload Capacity | 1.5 times rated current for 60 seconds, interval 1 hour |
| Dielectric Strength | 3000VAC / 50Hz / 5mA / 1Min |
| Insulation Resistance | ≥100MΩ (1000VDC) |
| Protection Grade | IP00 / IP20 |
| Insulation Class | Class F (155℃) |
| Temperature Class | T40 |
| Flame Rating | UL94V-2 |
| Noise Level | ≤65dB (tested at 1 meter) |
| Service Life | ≥15 years |
| Standards | IEC289:1987, GB10229-88, JB9644-1999 |
Dufew Electric specializes in industrial power component manufacturing and provides customized reactor solutions for global customers.
Our quality control process includes:
- ISO quality management system
- CE certified products
- Electrical performance testing
- Insulation resistance testing
- High voltage withstand testing
- Temperature rise testing
- Noise inspection
Each reactor is inspected according to customer specifications before shipment to ensure reliable performance after installation.
Industrial reactors require professional packaging protection due to their weight and electrical structure.
Dufew provides:
- Moisture-proof packaging
- Shock-resistant fixing inside wooden cases
- Customized packaging based on product size and weight
- Export-standard transportation solutions
Transportation options:
| Transportation Method | Application |
|---|---|
| Sea Freight | Large quantity and heavy industrial equipment shipment |
| Air Freight | Urgent samples or small reactors |
| Land Transportation | Domestic and regional delivery |
An Input Line Reactor should be installed between the AC power supply and the VFD input terminals. It is designed to reduce grid-side harmonic problems, suppress electrical disturbances, and protect the inverter input circuit. It should not be installed between the VFD output and motor.
Common voltage drop options include 0.5%, 1%, 2%, and 4%.
For general VFD applications, a 2% voltage drop is commonly selected. Systems with severe harmonic interference or unstable power supply conditions may require higher impedance based on application requirements.
It depends on the system design and operating conditions. In most industrial applications, each VFD is recommended to use an individual reactor to achieve better harmonic control and protection performance.
The reactor requires minimal maintenance. Regular inspection should focus on:
- Terminal connection tightness
- Dust accumulation
- Abnormal noise
- Temperature rise
Proper ventilation, correct installation, and regular inspection help maintain long-term reliability.
Suzhou Dufew Electrical Co., Ltd.
Address: Building 5, No.364 Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou, Jiangsu, China
Phone: +86-512-67666706
Fax: +86-512-67666706-8012
From industrial resistors and braking systems to reactors, filters, and transformers, Dufew Electric provides customized power electronics components and electrical solutions for industrial applications worldwide.
With professional manufacturing capability, engineering support, and strict quality management, Dufew helps customers build safer, more stable, and more efficient electrical systems.
Address
No. 364, Kangyang Road, Huangdai Town, Xiangcheng District, Suzhou City, Jiangsu Province, China
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