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Electromagnetic interference (EMI), or radio frequency interference (RFI), is a type of electric or electronic emission that can degrade, impair or prevent electrical circuit performance.

EMI filters are used to suppress interference generated by a device, or by other equipment, and 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.