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EMI/ RFI Filter

What is an EMI Filter?

An EMI filter, or electromagnetic interference filter, is an electronic passive device used to suppress conducted interference present on a signal or power line. EMI filters are used to suppress interference generated by the device, or by other equipment, to protect a device from electromagnetic interference signals present in the environment. Most EMI filters consist of components that suppress differential and common mode interference.

To protect and optimize equipment, Enerdoor EMI/ RFI filters provide solutions in three product categories: single-phase, three-phase, and three-phase plus neutral filters.

Types of EMI Filters

Enerdoor single-phase filter series offers a current range from 1 to 100A with nominal voltage up to 690 Vac. These filters guarantee high attenuation with compact mechanical dimensions.  Available with various connections such as: IEC plugs, fastons, terminal blocks, cables, and screws. Additional DIN rail mounting provides fast and easy installation into the enclosure.  For all models, a dedicated low leakage current solution is available for medical applications.

Enerdoor three-phase filter series offers a current range from 1 to 3000A with nominal voltage up to 690 Vac. This series is one of the largest and most complete for solutions in the industrial automation industry. These filters provide high attenuation in a compact case with low leakage currents and are suitable for several industries.  

Available with terminal block, cable, screw and bus bar connections and with finger safe protection for screw and bus bar options.  DIN rail mounting provides fast and easy installation into the enclosure.  Enerdoor offers solutions in traditional TN and TNS networks and in specific applications such as IT power line configurations. Customized voltage, current, connection, and attenuation solutions are available to satisfy various application needs.

Enerdoor three-phase plus neutral filter series offers a current range from 1 to 2000A with nominal voltages up to 600 Vac. This series provides high attenuation in a compact case with low leakage current and is suitable for several industries.  Available with terminal block, cable, screw and bus bar connections and with finger safe protection for screw and bus bar options.  DIN rail mounting provides fast and easy installation into the enclosure.  Customized voltage, current, connection, and attenuation solutions are available to satisfy various application needs.

 Applications for EMI Filters:

Typical EMI filter applications include:

  • Machine tools
  • Packaging equipment
  • Industrial automation
  • Renewable energy
  • Filtration systems
  • Medical equipment

单相 RFI 滤波器

单相 RFI 滤波器 image

Enerdoor offers different possibilities in terms of attenuation of single - phase RFI filters , allowing our customers to choose the correct...

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三相滤波器 image

不同功率设备的出现要求更多更好的产品来满足不同需要.从工业自动化到再生能源领域. Enerdoor有足够的经验和承诺提供给你所有产品以解决方案. 我们的产品范围能根据衰减和电器特性提供不同的方案. 电流范围从5A 到2500A. 标称电压可到交流690V....

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三相四线 image

为完善覆盖所有的应用, Enerdoor 提供三相四线的产品. 过滤中线满足规定的最低标准.我们的三相四线滤波器能达到2500A 的电流和交流电压至690V.当然还可以提供低的和非常低的泄露电流. 另外, 可能的联接方式还包括端子,紧固件和不同形状汇流条....

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FIN1220 和 FIN 1520开发于过滤直流线路当能提供区别于虚拟零点的对地联接.这个对于避免循环的保护接地导体的大电流的关键网络非常有用.

1520.0V 和1220.V 提供象三相网络的第一种系列产品. 直流滤波器范围电压可以达到直流1500V其它电压也能按要求定制.


Enerdoor developed the Motor Protection series to protect motors from harmful overvoltage and dV/dt spikes generated on the output. This is particularly useful for applications with variable frequency drives and servo-motors. 

This series includes common mode and differential mode inductances, sine wave filters and snubbers designed to work with various frequency switches, output frequencies and applications.  

The sine wave filter series reduces the pulse wave modulation (PWM) effect, converts the PWM to a sine wave and reduces dV/dt. The FIN915SF model is used with fundamental frequencies up to 2 kHz. The high frequency inductance FIN960F is a unique solution used for synchronous spindle motor applications.

To view the full Enerdoor catalog, please click here.  


Power quality is a significant concern for manufacturing and power generation facilities. This is due to harmonic disturbance and reactive power, which is produced by unbalanced loads, variable frequency drives and motors. These issues have serious consequences, including prematurely aging of equipment, unreliable controls, system synchronization loss, and increased energy, maintenance and replacement costs.

Enerdoor is an industry leader in radio frequency interference solutions. The Enerdoor harmonic filter series solves harmonic disturbance and power quality issues by compensating current harmonic and power factor correction generated by industrial loads. 

To view the full harmonic filter brochure, please click here.


无源偕波滤波器 image

The introduction of power devices such as variable frequency drives in many areas have resulted in great improvement in energy saving...

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有源谐波滤波器 image

Power quality is a major concern for manufacturers and power plants. Power quality issues arise due to harmonic disturbances and reactive power...

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我们的并联EMI/RFI 滤波器是工业中独特的解决方案.电压最高到750V 交流.这些滤波器由于它们的并行特性可以承担任何电流.

当你选用Enerdoor的滤波器系列, 这个有力的组合可以在噪音最大的环境中保护设备.

所有的并联滤波器提供从30K 赫兹起的高水准的衰减同时提供一个低频问题的解决方案.

FIN730/740 滤波器降低从30K 赫兹到10M 赫兹的干扰. FIN230 有150K 赫兹的谐波频率, 极大的降低了从50K 赫兹到5兆赫兹的干扰. 这二种的衰减大大低于150K 赫兹的要求.

感谢这些滤波器的性能, 并行滤波器可以单独使用或者与其它频率范围降噪特别好的滤波器系列合用.Enerdoor 并联滤波器是UL标准同时具备德标导轨安装能方便快捷的安装. FIN230SP能提供给变频器控制器和其它电子设备足够的保护.

Power Factor Correction

MRI 滤波器 – 军用滤波器

The Enerdoor medical filter series is designed to achieve a high level of shielding on protected environments. All models are characterized by high levels of attenuation above 100 dB. For each application there are models suitable for filtering supply lines 50 and 60 Hz from single phase to three phase, with currents of up to hundreds of amps and filters for signal lines (remote controls, lines connecting sound, video, telephony, digital signals).

Models are characterized by a leakage current to ground (below 30 mA), which allows use in any environment without the need of special installation procedures. All models are built and tested conforming to all military regulations: MIL.F-15733, MIL-STD-220A and Civil UL1283.

Product range includes models suitable for various applications where required attenuations are equal to or greater than 100 dB, with different possibilities in terms of frequency band, depending on the application.

Filters for military applications: 10 KHz - 10 GHz
Filters for medical applications in a 5 MHz - 5 GHz
Filters for applications scientific and industrial laboratories, for example, measuring 100 KHz - 10 GHz 


The Enerdoor voltage stabilizer series regulates voltage through a series of transformers. A static control circuit drives the variable autotransformer that supplies the required voltage to a series transformer, either in phase or out of phase, to bring the mains to the rated value. 

Three-phase stabilizers are available in two versions:
The models FINSTT and FINSTC perform voltage regulation by an average of three phases and are suitable for lines with balanced voltage and for an unbalance between phases up to 50%. These models are equipped with one stabilizing circuit to ensure a common regulation of the three-phase and may be connected to input mains without neutral.

The models FINSTTY and FINSTCY are equipped with one stabilizing circuit for each phase and are suitable for unbalanced mains with a maximum unbalance between phases up to 100%. For correct operation, the input line must be three-phase + neutral. Voltage regulators do not transform the voltage and therefore have the same output voltage as the input. When input and output voltages are different, an additional isolating transformer or auto-transformer is required.

To view the full voltage stabilizer brochure, please click here


The Enerdoor surge arrester series has been specifically designed to offer surge protection for electrical equipment. Surge arresters are installed at the front end of a system for the purpose of diverting harmful overvoltage transients caused by external (lightning) and/or internal (switching) events to ground safely. Also known as Surge Protection Device (SPD), or Transient Voltage Surge Suppressor (TVSS), Enerdoor surge arrestors protect against electrical transients resulting from lightning strikes that find their way onto electrical conductors.

All models include remote contact, visual indicator, and comply with the UL 1449, IEC 61643-11, and VDE 0675 International Standards. DIN rail or screw mounting options are available with select models offering plug and play replaceable cards for quick and easy installation and replacement.

To view the Enerdoor Surge Arrester catalog, please click here.  


艾希霍夫ELEKTRO KFT匈牙利公司成立于1989年被称为整个欧洲高品质的创新解决方案,生产安全封装变压器和电子点火系统艾希霍夫产品是由国际市场,销往美国欧洲亚洲各地

艾希霍夫ELEKTRO KFT在2011年光荣地加入Enerdoor集团大部分产品通过了UL认证,德国VDE认证公司通过ISO 9001认证制造商


Ignition System

In 2011 The Enerdoor Group acquired Eichhoff Elektroa Hungarian company established in 1989.  Eichhoff is known throughout Europe for high quality innovative solutions for safety encapsulated transformers, electronic ignition systems, and ignition transformers. Eichhoff is an ISO 9001 Certified manufacturer with the majority of products being UL recognized and VDE approved. These products are made for the international market and extensively sold throughout the United States, Europe, and Asia.   

To view the full transformer brochure, please click here. 

Enerdoor electronic ignition systems are ideal for cooking, baking and heating appliances. Features include: 

  • Low power consumption  
  • Repetitive spark ignition
  • One to six ignition points
  • Long life guaranteed semiconductors
  • Fastons for mains and high voltage

Enerdoor ignition transformers are ideal for gas and oil burners. Features include: 

  • High frequency ignition system
  • Safe and stable ignition
  • Quality based on individual testing



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