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What is the difference between a surge arrester and a transient voltage surge suppressor (TVSS)?

April 26, 2017arrester difference suppressor surge transient TVSS voltage

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What is the difference between a surge arrester and a transient voltage surge suppressor (TVSS)?

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These terms are often used interchangeably and rather loosely. However, the two terms have different meanings as defined by the National Electrical CodeÂ® (NECÂ®) (www.nfpa.org), their UL listing, and applicable IEEE/ANSI standards. A secondary arrester refers to a surge protective device (SPD) that is listed for use ahead of the primary disconnect to a facility (the service entrance panel), while a transient voltage surge suppressor (TVSS) is only listed to be used after this primary disconnect. An SPD listed under UL1449 as a TVSS device must not be connected ahead of the primary disconnect to a facility.