EMI / EMC Filters for Power Line Noise Suppression

DOREXS manufactures EMI / EMC filters for reducing conducted electromagnetic interference on AC and DC power lines. Our power line filters are designed for industrial equipment, medical electronics, motor drives, power conversion systems, communication equipment, renewable energy systems and other applications requiring reliable EMC performance.

15+ Years EMI Experience

Standard + Custom Filters

Application Engineering Support

Electrical & EMC Testing

EMI / EMC Filter Product Categories

Different power systems, equipment architectures and EMC problems require different filter configurations. Select a product category according to the power input, rated current, mechanical installation and required noise attenuation.

Single Phase EMI Filters

DOREXS single-phase EMI filters are designed for 115/250VAC power inputs and reliable suppression of conducted common-mode and differential-mode noise. Multiple chassis, wire-lead, terminal and low-leakage configurations are available for industrial automation, switching power supplies, medical equipment, communication systems and other single-phase electronic equipment.
single phase EMI/EMC filter
single phase EMI/EMC filter

Three Phase EMI Filters

DOREXS three-phase EMI filters are built for demanding industrial power systems, with 3-wire and 4-wire configurations and selected series covering 6A–1000A. Single-stage, dual-stage and multi-stage designs support VFDs, servo drives, CNC equipment, industrial automation, power conversion and other high-power EMC applications.

IEC Inlet EMI Filters

DOREXS IEC inlet EMI filters combine AC power entry and conducted EMI suppression in a compact design. I Series options cover 1A–20A and 115–250VAC, with fuse and switch configurations available. They are ideal for medical, industrial, laboratory and commercial equipment requiring simplified power-entry integration and space-efficient filtering.
IEC inlet EMI/EMC filter
DC EMI/EMC filter

 DC EMI Filters

DOREXS DC EMI filters are designed to suppress conducted interference in DC power systems, with compact standard models for 12–100VDC applications and high-current custom solutions available. Typical applications include EV charging, battery energy storage, telecom power, solar inverters, industrial DC equipment, converters and DC motor systems.

PCB EMI Filter

DOREXS PCB EMI filters integrate directly onto circuit boards to save enclosure space and simplify power-input filtering. The DAP series provides compact pin-mount solutions for conducted common-mode and differential-mode noise suppression, supporting industrial controls, communication electronics, power supplies and other space-constrained electronic equipment.
PCB EMI/EMC filter
Feedthrough EMI/EMC filter

Feedthrough EMI Filters

DOREXS feedthrough EMI filters provide high-frequency noise suppression at enclosure and bulkhead interfaces. Capacitive, π-type, multi-line and high-current configurations are available for communication, industrial, aerospace, military and shielded electronic systems requiring strong high-frequency attenuation, compact panel integration and flexible electrical or mechanical customization.

Medical EMI Filters

DOREXS medical EMI filters are designed for sensitive equipment requiring effective conducted-noise suppression with controlled leakage current. Available solutions include single-phase and IEC inlet configurations, with selected low-leakage designs below 0.5mA. Typical applications include diagnostic equipment, patient monitoring systems, laboratory instruments and medical power supplies.
DOREXS medical emi filter
DOREXS DF Series VFD emi filter

VFD EMI Filters

DOREXS F Series VFD EMI filters are designed for the AC input of variable frequency drives and motor-drive systems. Selected models cover 6A–800A at up to 440VAC, with bolt and copper-bar connections for different power levels. They are suitable for HVAC, pumps, elevators, CNC machines and industrial automation.

Choose by Power System

Single Phase →
Three Phase →
DC →

Choose by Application

Industrial →
Medical →
VFD →
EV / Renewable →

Not Sure Which EMI Filter You Need?
Send us your operating voltage, current, equipment type, EMC test result and installation space.

EMI / EMC Filter Products

EMI/EMCFilterProductCategories Differentpowersystems,equipmentarchitecturesandEMCproblemsrequiredifferentfilterconfigurations.Selectaproductcategoryaccordingtothepowerinput,ratedcurrent,mechanicalinstallationandrequirednoiseattenuation. SinglePhaseEMIFilters DOREXSsingle-phaseEMIfiltersaredesignedfor115/250VACpowerinputsandreliablesuppressionofconductedcommon-modeanddifferential-modenoise.Multiplechassis,wire-lead,terminalandlow-leakageconfigurationsareavailableforindustrialautomation,switchingpowersupplies,medicalequipment,communicationsystemsandothersingle-phaseelectronicequipment. ExploreSinglePhaseEMIFilters→ ThreePhaseEMIFilters DOREXSthree-phaseEMIfiltersarebuiltfordemandingindustrialpowersystems,with3-wireand4-wireconfigurationsandselectedseriescovering6A
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Industrial EMI Filter
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Model NO.：DOREXS 10A 3 Phase EMI Filter

DOREXS Three Phase EMI Filter 10A for Industrial EMC Applications

Industrial-Grade Three Phase EMI Filter 10AnnReliable Conducted EMI Suppression for Industrial Automation, Servo Drives, Inverters, UPS Systems and Power Equipmentnn✓ Rated Current: 10Ann✓ Rated Voltage: 380VAC / 440VACnn✓ High Insertion Lossnn✓ Compact Metal Housingnn✓ CE & RoHS Certifiednn✓ OEM & ODM Available

single phase emi filter 1a
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Model NO.：DOREXS 1 A Single Phase EMI Filter

Single Phase EMI Filter 1A for Compact Electronic Applications

Reliable 1A Single Phase EMI Filter for Conducted Noise Suppressionn✓ Rated Current: 1 Ampn✓ Single Phase AC Inputn✓ Compact Designn✓ High Insertion Loss Performancen✓ Supports EMC Compliancen✓ Custom Design Available

10A EMI power filter
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Model NO.：DOREXS 10 A single phase EMI filter

10A Single Phase EMI Filter for Industrial Equipment and EMC Compliance

DOREXS 10A single phase EMI filter is designed to suppress conducted electromagnetic interference generated by industrial equipment, switching power supplies, servo systems, and electronic devices. nn✔ Wide Frequency Noise Suppression（150KHz-30MHz)n✔ Compact Mechanical Designn✔ High Reliability Constructionn✔ Low Leakage Current Options(medical type)n✔ Flexible Mounting Optionsn✔ OEM / ODM Supportn✔ International Compliance Support(UL、ISO 9001、CE&Rohs)

20A single phase EMI filter
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Model NO.：DOREXS 20 A single phase EMI filter

20A Single Phase EMI Filter for Industrial EMC & Conducted Noise Suppression

Suitable for industrial automation systems, medical devices, VFD applications, and OEM equipment manufacturing, this single phase power line filter supports custom electrical specifications and application-specific EMC optimization.nn✔ Rated Current: 20An✔ Single Phase AC Inputn✔ High Attenuation Performancen✔ Conducted EMI Suppressionn✔ Compact Metal Housingn✔ OEM / ODM Customizationn✔ Industrial Grade Reliabilityn✔ Global EMC Compliance Support

30A single phase EMI filter
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Model NO.：DOREXS 30A single phase EMI filter

30A Single Phase EMI Filter for Industrial Equipment and EMC Compliance

DOREXS 30A Single Phase EMI Filter is designed to suppress conducted electromagnetic interference (EMI) generated by electronic equipment, switching power supplies, servo systems, and industrial automation machinery. nn✔ Rated Current: 30An✔ Single Phase AC Power Filtern✔ High Attenuation of Conducted EMI Noisen✔ Effective Common Mode and Differential Mode Suppressionn✔ Compact Metal Enclosure Designn✔ Low Leakage Current Options Availablen✔ Easy Chassis Mount Installationn✔ Excellent EMC Compliance Performancen✔ UL、CE & RoHS Compliantn✔ OEM & Custom EMI Filter Solutions

three phase emi filter 20a
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Model NO.：DOREXS 20A three phase EMI filter

Three Phase EMI Filter 20A for Industrial Equipment & EMC Compliance

Industrial Three Phase EMI Filter 20A Manufacturer | OEM & Custom EMC Solutionsnn✔ Rated Current: 20Ann✔ Rated Voltage: 380VAC / 440VAC / Custom Availablenn✔ Frequency: 50/60Hznn✔ Three Phase Power Line EMI Filternn✔ Excellent Common Mode & Differential Mode Attenuationnn✔ CE & RoHS Compliantnn✔ OEM / ODM Customizationnn✔ Fast Engineering Support

three phase emi filter 30a
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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.nn✔ Rated Current: 30Ann✔ Rated Voltage: 380VAC / 440VACnn✔ Custom Voltage: Up to 800VACnn✔ Three Phase Three Wirenn✔ Three Phase Four Wirenn✔ High Insertion Lossnn✔ Low Leakage Currentnn✔ Compact Industrial Designnn✔ OEM & Custom EMC Solutions

40A single phase EMI filter
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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. nn✔ Rated Current: 40An✔ Rated Voltage: 115/250VACn✔ Frequency: 50/60Hzn✔ single stage & double stagen✔ Excellent Common Mode & Differential Mode Noise Suppressionn✔ Compact Metal Enclosuren✔ UL、CE & RoHS Compliantn✔ OEM & Custom EMI Filter Available

What Is an EMI / EMC Filter?

An EMI filter is an electrical filtering network used to reduce unwanted high-frequency electromagnetic interference conducted through power lines.

Most power line EMI filters use combinations of inductors, common-mode chokes and capacitors to create low impedance paths or high impedance barriers for unwanted noise while allowing the required AC or DC power to pass to the equipment.

The term EMI filter describes the function of suppressing electromagnetic interference.

The term EMC filter is commonly used when the filter is part of an overall electromagnetic compatibility strategy.

In practical industrial applications, EMI filter, EMC filter, power line filter and RFI filter are often used to describe closely related filtering products.

EMI Filter Workflow Diagram