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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

Single Phase RFI Filter Models

Single Phase RFI Filter Models 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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Three Phase EMI Filter Models

Three Phase EMI Filter Models image

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...

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Three Phase Plus Neutral

Three Phase Plus Neutral image

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...

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DC Filter

Enerdoor DC Filters were designed specifically for the photovoltaic industry and offer a current range from 5 to 3000A with nominal voltage up to 1000 VDC. The FIN1220 and FIN1520 models, installed between PV inverters and solar panels, reduce EMI interference in the DC power line. 

The FIN1220.0V and FIN1520.0V models offer the possibility of ground connections separated from the virtual zero point. This is particularly useful for critical networks on the protective earth conductor.  

Custom DC filters are available upon request.

To view the full Enerdoor catalog, please click here.  

Motor Protection

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.  

Harmonic Filter

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.

Passive Harmonic Filter

Passive Harmonic Filter 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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Active Harmonic Filter

Active Harmonic Filter 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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Parallel Filter

Enerdoor parallel filter series is a unique solution available with nominal voltage up to 750 Vac and handles any current level due to the parallel nature. These filters are available in 3-phase and 3-phase plus neutral, are UL recognized and feature DIN rail mounting allowing for fast and easy installation.  Parallel filters provide high attenuation in the frequency range of 10 KHz to 5 MHz thus providing a solution for applications with low frequency problems. When used in conjunction with an Enerdoor filter series, this combination ensures RF protection for equipment in any environment.

The FIN730 and FIN740 filters reduce EMI interference in the 30 kHz to 10 MHz frequency range. The FIN230 filter has a resonance frequency of 150 kHz and provides a large interference reduction in the frequency range between 50 kHz and 5 MHz.  Enerdoor parallel filters provide protection for variable frequency drives, SCR, controllers, and other electric equipment.

To view the full Enerdoor catalog, please click here.  

Power Factor Correction

Medical and Military Filter

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 

Voltage Stabilizer

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

Surge Arrester/ Protection

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.  

Safety Encapsulated Transformer

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.   

Enerdoor safety transformers are important elements for an interference-free current supply and guarantee long lasting function of equipment. This extensive line includes small transformers and safety transformers of various designs with various mounting and connection options with performance data up to 100 VA. The potted transformers are produced on automated manufacturing systems.  

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 sold throughout the United States, Europe, and Asia.

To view the full transformer brochure, please click here.

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

Custom Filter

In addition to our complete offering of standard EMI/RFI filters, Enerdoor offers custom filter solutions for unique applications and mechanical requirements and provides filtering in ranges not offered in our standard products.

Our global support and flat rate testing service by industry experts, gets your product to market in a reduced time and at a lower cost.

Enerdoor custom filters:

  • Fit unique mechanical size, installation and connection requirements
  • Provide filtering in ranges not offered in standard EMI/RFI products
  • Save time and money by getting your product to the market quickly and with correct approvals

Please contact us today to discuss how a custom Enerdoor filter solution can work for you.

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