three phase emi filter 30a
Model No: DOREXS 30A 3 phase EMI filter

Three Phase EMI Filter 30A | Industrial EMC Power Line Filter

Supporting 380VAC and 440VAC industrial power networks, with custom voltage solutions available up to 800VAC, this filter is suitable for both three phase three wire and three phase four wire electrical systems.

✔ Rated Current: 30A

✔ Rated Voltage: 380VAC / 440VAC

✔ Custom Voltage: Up to 800VAC

✔ Three Phase Three Wire

✔ Three Phase Four Wire

✔ High Insertion Loss

✔ Low Leakage Current

✔ Compact Industrial Design

✔ OEM & Custom EMC Solutions
Quantity :
Contact Now
 

Superior EMI Noise Suppression for Industrial Three-Phase Equipment

The 30A three-phase EMI filter eliminates conducted electromagnetic interference from your industrial power line, delivering clean, stable power to critical equipment. Whether you're running variable frequency drives, UPS systems, or CNC machine tools, this power line filter suppresses high-frequency noise across all three phases—ensuring your machinery operates without disruption and your facility meets international EMC compliance standards.
Designed for demanding industrial environments, the 30A rating handles continuous full-load current on each phase while attenuating differential-mode and common-mode noise that would otherwise compromise sensitive electronics and other devices sharing the same supply network.

Why Choose the DOREXS Three Phase EMI Filter 30A?

Unlike general-purpose three-phase filters, the DOREXS 30A series three-phase power line filters are optimized for industrial applications, making them particularly suitable for scenarios with stringent requirements regarding electrical noise suppression, equipment reliability, and regulatory compliance. 
 
✔ Excellent conducted EMI suppression✔ High insertion loss over a broad frequency range✔ Durable metal housing for industrial environments
✔ Stable performance under continuous heavy-duty operation✔ Compact structure for easy installation✔ Supports both 3-phase 3-wire and 3-phase 4-wire systems
✔ Low leakage current design✔ Custom electrical parameters available✔ OEM & ODM manufacturing support
 

Technical Specifications

Parameter

Specification

Product Type：3-phase EMI filter (two-stage/Multi-stage)
Rated Current：30A continuous per phase
Rated Voltage：380VAC / 440VAC
Custom Voltage：Up to 800VAC
Frequency:50/60 Hz
Phase Configuration: Three-Phase Three-Wire / Three-Phase Four-Wire
Leakage Current :Low Leakage Design
Installation:  Bolt, terminal block, power cord, DIN rail
Insulation Resistance: ≥100MΩ
Operating Temperature:-25°C to +85°C
Housing Material：Nickel-plated iron casing
Certifications:CE, RoHS compliant
 
Series Availability: Three-phase filters are rated from 20 A to 2500 A across different types in the DOREXS product range
 
download date sheetrequest a quote 

Product Pictures

Detail Picture

DAC3 30A three phase emi filter,boltDF1 vfd 30a 3 phase emi filterDAC41 30A three phase power line filter ,terminal block

DAC3-30A

DF1-30A

DAC41-30A

 
 

Overall Dimension (±1 mm)

DAC3 3 PHASE EMI FILTER Screw Terminal Overall Dimension

 
DF1 3 PHASE EMI FILTER Screw Terminal Overall Dimension

 
DAC41 3 PHASE EMI FILTER Screw Terminal Overall Dimension

 
DAC3DF1DAC41

Circuit Diagram

Two-stage EMI FILTER Circuit Diagram

 
Multi-stage EMI FILTER Circuit Diagram

 

Two-stage

Multi-stage

Ideal Applications

The DOREXS 30A three-phase EMI filter is widely used across various industrial sectors where electrical noise suppression and EMC compliance are essential.

 
Typical Applications of Three Phase EMI Filter 30A
 

  • Industrial Automation Equipment

  • CNC Machines

  • Servo Systems

  • Variable Frequency Drives

  • Power Distribution Cabinets

  • Renewable Energy Equipment

  • Industrial Robots

  • Elevator Systems

  • Pump Control Systems

  • Compressor Systems

  • Packaging Machinery

  • Textile Machinery

  • Medical Industrial Equipment

  • Semiconductor Manufacturing Equipment

  1. Industrial automation engineersdesigningmotor drive systems, packaging machinery, and robotics platforms where EMI filters are often used in variable frequency drives, industrial machinery, and robotics

  2. OEM manufacturers of medical devices, test equipment, and precision instrumentation requiring EMC compliance and clean power for sensitive electronics

  3. Electrical contractors installing VFDs, UPS systems, and CNC machine tools in facilities where three-phase filters provide effective noise suppression for industrial applications

  4. Maintenance teams upgrading existing equipment to meet current EMI standards, especially in facilities with power line noise issues affecting production quality

Three-phase filters are suitable for UPS and motor drives, and they protect industrial machinery from electrical noise interference. If your search for a reliable EMI solution has led you here, this product fits your needs.
 

Insertion Loss Performance

The DOREXS 30A 3-phase EMI filter is engineered to provide stable insertion loss performance against both:
  1. Common Mode Noise Reduction—Helps suppress interference transmitted between line conductors and ground.
  2. Differential Mode Noise Reduction—Reduces noise generated directly across power conductors.

What Makes It Different

Most standard line filter products provide only basic single-stage suppression—enough for light-duty applications but insufficient when converters, VFDs, and high-power switching equipment generate aggressive conducted emissions.

The DOREXS three phase EMI filter 30A is built differently:

  • Multi-stage filtering topology – A two-stage circuit design combines differential-mode inductors, X capacitors (line-to-line), common-mode chokes, and Y capacitors (line-to-ground) to deliver substantially higher attenuation than single-stage competitors. The difference is measurable: typical insertion loss exceeds 50 dB in the 1–10 MHz region where switching noise is most problematic.

  • Optimized for 30A applications—The internal copper windings of a 30 A filter is sized to prevent overheating during operation, and the current rating is specifically engineered so you don't need to oversize your filter, reducing system costs. Available configurations for three-phase EMI filters include Wye and Delta systems, giving you flexibility to match your facility's wiring topology.

  • Custom design capability—DOREXS offers application-specific modifications, including adjusted capacitor values for lower leakage current, non-standard voltage ratings, custom mounting, and tailored attenuation profiles for unique industrial requirements.

Mechanical Design

This 3-phase filter supports compact panel integration for industrial systems.
Installation recommendations:
  • Install close to power entry points
  • Minimize cable loop area
  • Separate input and output wiring
  • Ensure proper grounding connection
  • Avoid parallel routing of noisy cables
Correct installation significantly improves EMC suppression performance.

Certifications & Compliance

DOREXS's three phase EMI filter 30A is manufactured under rigorous quality control processes to meet international EMC standards.
Compliance support provided includes:
  • CE compliance
  • RoHS compliance
  • EMC testing support
  • ISO 9001 certification
  • Industrial quality management
  • OEM documentation support

Custom EMI Filter Solutions

As a professional three-phase EMI filter manufacturer, DOREXS provides OEM and ODM EMI filter solutions tailored to specific EMC requirements.
Customization options include:
  1. Custom rated current
  2. Custom voltage up to 800VAC
  3. Low leakage current versions
  4. Medical-grade leakage options
  5. Special attenuation curves
  6. Customized terminal structures
  7. DIN Rail mounting options
  8. High-current industrial filters
  9. OEM branding
  10. Complete EMC optimization support
Our engineering team works closely with equipment manufacturers to ensure every filter achieves optimal EMC performance while meeting international compliance requirements

Why Choose DOREXS?

Trusted Three Phase EMI Filter Manufacturer
DOREXS specializes in the design and manufacturing of industrial EMI filters for global OEM customers.
Comprehensive Product Range

Manufacturing Advantages

  • Professional EMI Filter Manufacturer
  • OEM & ODM Available
  • Experienced EMC Engineering Team
  • Strict Quality Control
  • Fast Sample Delivery
  • CE & RoHS Compliance
  • ISO9001 Manufacturing System
  • Global Export Experience
  • Technical Support Throughout the Project

Ready to Protect Your Equipment?

Whether you need a standard 30A three-phase EMI filter or a fully customized EMC solution, the DOREXS engineering team is ready to help.

From product selection and EMC optimization to OEM manufacturing and global delivery, we provide one-stop EMI filter solutions for industrial equipment manufacturers worldwide.

Request a Quote Today and discuss your EMC requirements with our engineers.

FAQ

What insertion loss performance can I expect?

Minimum 40 dB attenuation from 150 kHz to 30 MHz, with typical performance exceeding 50 dB in the 1–5 MHz region. High-frequency noise typically spans from 150 kHz to 30 MHz in EMI filter applications, and this filter is designed to confirm effective suppression across that entire band. Three-Phase EMI filters offer effective noise suppression and help maintain compliance with federal EMI regulations.

How do I size the filter for my application?

Select based on your continuous load current—the 30A rating provides margin for motor starting currents. If your application operates at elevated ambient temperatures (above 50°C), account for thermal derating. For applications requiring higher current capacity, find the right fit in our 3-phase EMI filter C series ranging from 6A to 1000A.

Can this filter be used with VFDs?

Yes. This filter is specifically designed for variable frequency drive applications. It suppresses conducted emissions from VFD switching, preventing noise from propagating back onto the power line and interfering with other devices. EMI filters protect against interference with nearby devices and help meet regulatory standards.

What's the difference between single-stage and multi-stage filters?

Yes. As a dedicated EMI filter manufacturer, DOREXS provides customized solutions for unique requirements—whether you need different types of attenuation profiles, modified leakage current levels, or non-standard mounting configurations. Every customer receives dedicated engineering support.

What about custom modifications?

DOREXS offers custom EMI filter design, including modified voltage ratings, adjusted leakage current levels, custom mounting configurations, and application-specific filtering topologies. Every customer requirement is evaluated by our engineering team to deliver the right solution.