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A ferrite suppression sleeve is a cylinder of ferrite with a hole in the middle through which a wire or cable is passed.

This device adds a "chunk" of inductance around the wire, and this results in the suppression of higher frequency signals. Power supply cables and other conductors that carry low frequency alternating current may have one of these sleeves installed. They are used to suppress high frequency interference and keep it from getting into or out of the equipment where they are installed. Use the link below to see some images and get a feel for what these are so you'll be able to spot them in the future.

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Q: What is a ferrite suppression sleeve?
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