Showing articles 1 - 10 (69 total)

EMI-RFI Filters Reduce High Frequency Electromagnetic Noise

EMI-RFI Filters are an electronic device used to suppress conducted interference from a signal or power line. Most electronics require an EMI filter either as a separate device or as a built-in circuit board to reduce high frequency electromagnetic noise between the drive and the mains power supply.

Since 1992, Enerdoor has been a global leader in EMI-RFI filters offering single phase, three phase, and three phase + neutral filters. 

For more information on EMI-RFI filters, please visit: 

Posted on 08/20/2018 at 01:56 pmViewed 288 times

Enerdoor Custom Filter Solutions

In addition to our complete offering of standard EMI-RFI and motor protection 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 EMC testing service by industry experts, gets your product to market in a reduced time and at a lower cost.

For more info please visit - or email   

Posted on 06/22/2018 at 10:46 amViewed 484 times

Voltage Stabilizers

Enerdoor specializes in single and three phase voltage stabilizers that regulate voltage through a series of transformers. Find out more about this extensive series and how you could save money today -

Posted on 06/13/2018 at 04:40 amViewed 624 times

Filter solutions for medical applications

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 from 60 dB with a frequency range from 9 KHz  to 10 GHz. For each application, there are suitable models for filtering supply lines from 50 Hz from single phase to three phase - designed for currents up to several hundred amperes.

For more information -

Posted on 06/05/2018 at 06:48 amViewed 559 times

Single-Phase EMI Filters Protect the Power Supply


EMI-RFI filters are typically installed on the main power line. However, did you know that single-phase filters may also be used to protect the power supply, PLCs, and sensors?  This white paper explains the benefits of using a single-phase EMI filter to protect these types of equipment. 

Switching devices within a machine generate radio frequency (RF) noise which travels back to the power line of the facility. When an EMI-RFI filter is installed, it blocks this RF noise. However, did you know that EMI-RFI filters can also protect equipment from RF interference and voltage spikes that could be coming in from surrounding equipment?  

The Challenge

A power supply requires clean power in order to avoid noise or interference that could affect sensor life or machinery performance. Larger facilities have several different types of equipment which create RF interference and voltage spikes that affect other devices.

Imagine a power supply installed inside a machine located in a large facility surrounded by other large pieces of equipment. How do you think the output supply and sensors are affected?

The Solution

To minimize the risk of interference, install an EMI-RFI filter on the power line. For example, in a three-phase machine application, the filter would protect the entire machine. It would protect the two-phase power line, including the power supply, PLCs and sensors.

The Result

A compact EMI-RFI filter on the power supply input reduces the risk of noise interference in the field and increases machinery life.  Enerdoor is committed to providing the highest level of customer support possible and bringing value to our customers.

For more info on Enerdoor EMI-RFI filters, click here

Posted on 05/30/2018 at 06:34 amViewed 579 times

Highlights from this months shows in Italy and Spain!

This month Enerdoor exhibited at the SPS Parma trade show in Parma, Italy and at BIEMH in Bilbao, Spain.  Please check back for info on future shows.  

Enerdoor is committed to power quality and electromagnetic solutions for automated machinery and industrial plants. Our product line includes: EMI-RFI filters, motor protection, harmonic filters, line reactors, surge arresters, voltage stabilizers, and flat-rate CE Certification. 

For further information on our extensive range of power electronics, please call our team at 207-210-6511 or email

SPS Parma show:

BIEMH show:

Posted on 05/30/2018 at 05:07 amViewed 537 times

Save money and energy with power factor correction

Power Factor Correction is the use of technology to restore power factor as close to unity as possible.  This is usually achieved by the additional use of capacitors to the electrical network. The Enerdoor FINSVG provides a better solution for power factor correction than the commonly used capacitor banks. Unlike capacitor banks, it is immune to harmonics through active load balancing by advanced digital control. The compensation capacity never declines and the system is capable of compensating both inductive and capacitive reactive power. 

The Enerdoor FINSVG offers compensation starting at 30 KVAR with a modular design and can be either wall or rack mounted. It is available starting at 208 Vac and may be installed in either a single unit system or multiple, parallel modules for entire facilities. 

For more info -

Posted on 05/14/2018 at 02:25 pmViewed 671 times

Parallel Filters

Enerdoor parallel filter series is a unique solution available with nominal voltage up to 750 Vac and handles any current 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.

Parallel filters provide high attenuation in the frequency range of 10 KHz to 5 MHz 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.

For more info -

Posted on 05/08/2018 at 02:54 pmViewed 753 times

DC Filters

The Enerdoor DC filter series was designed specifically for the photovoltaic industry. This series carries CE and UL approvals and offers a current range from 5 to 3000A with nominal voltage up to 1000 Vdc. 

Additional filter applications include:

• Single phase machines up to 700 Vac
• Renewable energy
• Recharging stations
• AC/DC converters

Learn more here -

Posted on 04/26/2018 at 04:07 pmViewed 744 times

EMC Testing and CE Certification

Since 1992, Enerdoor has specialized in the measurement and analyses of EMC testing and CE Certification, providing on-site flat rate testing to customers around the world through an efficient, global organization. Our flat rate testing service is unique in the industry, as is our pledge to not leave the facility until equipment is compliant.

Find out more here -

Posted on 04/17/2018 at 02:40 pmViewed 794 times

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