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How to choose the correct surge protection regarding a situation?

Newt page: Select the right upstream protection for a surge arrester

Which type of surge arrester for which situation?

Types of surge arresters

T1: only used when LPS is present
T2: used systematically.
T3: only used in addition to a T2 (as lower discharge capacity), if the loads are more than 30m from the incoming T2 surge arrester

* LPS (Lightning Protection System) = lightning rod, meshed cage on buildings)
** After 30m (between the surge arrester and the loads) lightning wave reflection phenomena appear in the cables.