Model No: DOREXS 40A single phase EMI filter
40A Single Phase EMI Filter for Industrial EMC Applications
The DOREXS 40A Single Phase EMI Filter is engineered to suppress conducted electromagnetic interference (EMI) in industrial power systems, helping equipment achieve stable operation and EMC compliance.
✔ Rated Current: 40A
✔ Rated Voltage: 115/250VAC
✔ Frequency: 50/60Hz
✔ single stage & double stage
✔ Excellent Common Mode & Differential Mode Noise Suppression
✔ Compact Metal Enclosure
✔ UL、CE & RoHS Compliant
✔ OEM & Custom EMI Filter Available
✔ Rated Current: 40A
✔ Rated Voltage: 115/250VAC
✔ Frequency: 50/60Hz
✔ single stage & double stage
✔ Excellent Common Mode & Differential Mode Noise Suppression
✔ Compact Metal Enclosure
✔ UL、CE & RoHS Compliant
✔ OEM & Custom EMI Filter Available
Quantity :
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Eliminate Power Line Noise and Protect Your Equipment from EMI Damage
A 40A single-phase EMI filter is designed to block unwanted high-frequency electrical noise from entering or leaving your equipment through the power line. At 40 amps continuous current, this filter sits at the critical junction between your AC supply and high-current loads-suppressing electromagnetic interference that would otherwise disrupt sensitive electronics, cause signal degradation, or trigger EMC test failures.
Whether you're powering industrial automation systems, medical devices, or heavy-duty power supplies, electromagnetic interference (EMI) on the line compromises performance and safety. EMI filters suppress electromagnetic interference in electrical systems by allowing low-frequency AC power to pass while blocking high-frequency interference across the 10 kHz to 30 MHz range. The result: clean, stable single phase power delivered to your equipment, full regulatory compliance, and protection against the real-world noise conditions that damage components and shorten device lifespan.
Whether you're powering industrial automation systems, medical devices, or heavy-duty power supplies, electromagnetic interference (EMI) on the line compromises performance and safety. EMI filters suppress electromagnetic interference in electrical systems by allowing low-frequency AC power to pass while blocking high-frequency interference across the 10 kHz to 30 MHz range. The result: clean, stable single phase power delivered to your equipment, full regulatory compliance, and protection against the real-world noise conditions that damage components and shorten device lifespan.
Why Use a 40A Single Phase EMI Filter?
| ✔ Superior EMI Suppression | ✔ Equipment Protection | ✔ Regulatory Compliance |
| Provides effective attenuation of both common mode and differential mode interference, ensuring excellent filtering performance across a wide frequency range for demanding 40A applications. | EMI filters provide two-way protection against electrical noise, guarding both your equipment and the wider power network. | Meets UL , CE, and international EMC standards to ensure compliance with global regulations. EMC compliance reduces the risk of equipment damage from EMI and prevents costly certification delays. |
| ✔ Reliable Performance | ✔ Easy Installation | ✔ Multi-Stage Filtering |
| Built for continuous operation in demanding environments where EMI filters are critical in industrial automation systems to ensure stable power supply. EMC solutions enhance the longevity of electrical systems. | Compact design with multiple terminal options-threaded stud, FASTON, and terminal block configurations-for simple integration into existing panels and enclosures. Single-phase filters are compact and easy to install; they occupy limited space and are lightweight. | Advanced π/T circuit topology delivers superior insertion loss across both differential mode noise and common mode interference from 10 kHz to 30 MHz and beyond. Where competitors offer 40–60 dB of attenuation in limited bands, multi-stage designs deepen suppression across the full conducted emissions range. |
| ✔ Low Leakage Current | ✔ High Surge Protection | |
| Standard industrial versions maintain leakage current below 2.5 mA at rated voltage. Optional medical-grade variants reduce earth leakage to ≤0.1 mA, meeting the strict thresholds of IEC 60601-1-2 without sacrificing attenuation. | Robust construction with Hi-Pot ratings of 1,800–2,500 VDC (line-line and line-ground, 2 seconds) ensures the filter withstands voltage spikes and power line transients that would damage lesser designs. |
Most 40A single phase filters on the market rely on single stage topologies that provide basic noise reduction at limited frequency bands. They work for simple applications but fall short when your equipment demands high performance suppression across the full EMI spectrum-or when leakage current must stay below medical-grade thresholds.
Installing a 40A single phase EMI filter helps prevent noise from entering or leaving the equipment through power lines, ensuring stable operation and compliance with international EMC standards.
Technical Specifications
Parameter | Specification |
| Product Type： | single phase EMI filter(single-stage/Multi-stage) |
| Rated Current： | 40A continuous |
| Rated Voltage： | 250 VAC single phase |
| Frequency: | 50/60 Hz |
| EMI Suppression Range: | 10 kHz – 30 MHz |
| Leakage Current (Industrial): | < 2.5 mA at 250 VAC |
| Leakage Current (Medical): | ≤ 0.1 mA (optional variant) |
| Hi-Pot / Insulation: | 1,800–2,500 VDC, 2 seconds (line-line and line-ground) |
| Operating Temperature: | –25°C to +85°C (up to +100°C for premium designs) |
| Housing Material： | Nickel-plated iron casing |
| Terminal Options: | Threaded stud (M6+), FASTON tabs, terminal block |
| Certifications: | UL 1283, CE, RoHS compliant |
EMI filters are rated for specific current and voltage ranges. High performance EMI filters provide high attenuation and low leakage current-this filter delivers both. Full datasheets and insertion loss curves (common mode and differential mode) are available through our download center.
Product Pictures
Detail Picture
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Screw Terminal | Insert | Line |
Overall Dimension（±1mm)
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| Insert | Screw Terminal | DIN Rail |
Circuit Diagram
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Single stage | Multi-stage |
Ideal Applications
The 40A EMI Filter is widely used in equipment requiring high-current single-phase power with effective conducted EMI suppression.
Industrial equipment manufacturers
Motor drives, variable frequency drives (VFDs), CNC machines, and industrial automation systems drawing up to 40A that require EMC compliance and stable operation. They are essential for industrial equipment like CNC machines and machine tools.
Power supply and UPS manufacturers
Switching power supplies, inverters, and backup systems handling 40A loads in single phase power applications. They are used in renewable energy systems like solar inverters.
Medical device companies
Imaging equipment, sterilizers, and high-current medical devices needing IEC 60601-1-2 compliance with ultra-low leakage current. EMI filters are used in medical equipment to prevent interference that could lead to errors. Single-phase filters are used in medical devices like MRI machines.
OEMs across various applications
HVAC systems, telecommunications equipment, heavy-duty appliances, office equipment, and consumer electronics requiring reliable radio frequency interference suppression at high current levels. Single-phase filters enhance performance in consumer electronics and are critical for telecommunications equipment.
If your electrical equipment operates at or near 40A on a single phase supply and you need to meet electromagnetic compatibility (EMC) regulations, this filter type is suitable for your application. Single-phase filters effectively reduce electromagnetic interference and enhance the stability and reliability of electronic equipment.
Insertion Loss Performance
The DOREXS 40A single phase EMI filter is engineered to provide stable insertion loss performance against both:
- Common Mode Noise Reduction-Helps suppress interference transmitted between line conductors and ground.
- Differential Mode Noise Reduction-Reduces noise generated directly across power conductors.
Mechanical Design
This 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 EMI filters are manufactured under rigorous quality control processes to meet international EMC standards.
Compliance support provided includes:
- UL compliance
- CE compliance
- RoHS compliance
- EMC testing support
- ISO 9001 certification
- Industrial quality management
- OEM documentation support
Custom EMI Filter Solutions
As a professional EMI filter manufacturer, DOREXS provides OEM and ODM EMI filter solutions tailored to specific EMC requirements.
Customization options include:
- Current Rating Adjustment
- Low Leakage Current Design
- Terminal Configuration
- Mounting Structure
- Enhanced Attenuation Performance
- Medical Grade Design
- High Reliability Industrial Design
Our engineering team can assist with EMC troubleshooting, filter selection, and custom filter development for demanding industrial applications.
Why Choose DOREXS?
Professional EMI Filter Manufacturer
Over a decade of experience in EMI and EMC suppression technologies.
Comprehensive Product Range
- Single Phase EMI Filters
- Three Phase EMI Filters
- Medical EMI Filters
- DC EMI Filters
- IEC EMI Filters
- Custom EMI Filters
Custom Design Support
OEM and ODM projects supported according to customer specifications.
Quality Assurance
Manufactured under strict quality management processes with international compliance standards.
Global Customer Support
Technical assistance available for equipment manufacturers, system integrators, and industrial OEM customers worldwide.
Ready to Protect Your Equipment?
Stop risking equipment failures, EMC test rejections, and costly downtime caused by unfiltered electromagnetic interference on your power line.
Choose the DOREXS 40A Single Phase EMI Filter for reliable, high performance EMI protection that meets the demands of industrial equipment, medical devices, and high-current single phase power applications.
EMI filters enhance the reliability of electronic equipment-and the right filter makes all the difference.
Contact us today for technical consultation, custom solutions, and fast delivery. Our engineering team is ready to help you find the right solution for your application.
Choose the DOREXS 40A Single Phase EMI Filter for reliable, high performance EMI protection that meets the demands of industrial equipment, medical devices, and high-current single phase power applications.
EMI filters enhance the reliability of electronic equipment-and the right filter makes all the difference.
Contact us today for technical consultation, custom solutions, and fast delivery. Our engineering team is ready to help you find the right solution for your application.
FAQ
What applications require a 40A single phase EMI filter?
Any single phase application drawing up to 40A that must meet EMC standards or protect sensitive downstream electronics. Common examples include industrial motors, VFDs, CNC machine tools, medical equipment, UPS systems, large power supplies, and heavy-duty appliances. Heavy-duty appliances often utilize EMI filters for noise suppression. EMC regulations ensure reliable operation of electrical equipment, and EMI filters help achieve compliance with international EMC standards. Single-phase filters are used in medical devices and industrial equipment across many industries.
How do I select the right 40A EMI filter for my application?
Start with your current rating and rated voltage requirements. Then consider the interference type you need to suppress-common mode, differential mode, or both. Evaluate your acceptable leakage current (especially critical for medical devices under IEC 60601-1-2), the frequency range of your noise source, and your installation constraints (terminal style, mounting, compact structure requirements). Our engineering team can help you match the right filter type to your load profile and compliance targets.
Can DOREXS provide custom 40A EMI filter solutions?
Yes. We offer custom single phase EMI filters tailored to your specific requirements-including custom insertion loss profiles, terminal configurations, mounting styles, and leakage current specifications. Our EMI filter design team works directly with manufacturers to develop solutions that deliver excellent performance for your exact application.
What certifications do your 40A single phase EMI filters have?
Our filters are designed to meet UL 1283, IEC/EN 60939, CE marking, and RoHS compliance requirements. Medical-grade variants are available for applications requiring IEC 60601-1-2 compliance. Test reports and certification documentation are available upon request. Single-phase filters provide strong protection for electronic equipment across the full range of global safety and EMC regulations.
Can you provide test reports?
Complete EMC test reports, insertion loss curves, and safety certifications are available upon request. Manufacturers increasingly require full traceability documentation, and DOREXS provides detailed performance data so you can verify that EMI filters meet compatibility standards for reliable operation of electronic systems.
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