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Select the right upstream protection for a surge arrester
Newt page: Install an overvoltage protection
The surge arrester has the same lifetime as the switchboard
At the end of its life, a thermal protector integrated into the surge arrester isolates the surge arrester from the rest of the installation.
The role of the surge arrester is to drive the lightning current to the earth in a very short time (< 350 microseconds). However, the surge arrester is not intended to be exposed to a permanent overvoltage (phase/neutral inversion, or neutral rupture). In this case, it would be short-circuited and may damage the switchboard.
A device protecting the surge arrester against short circuits is therefore required to ensure the safety of the electrical installation. |
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When making the choice of an upstream protection device,
Take into account: |
- lightning current withstand capacity (to avoid nuisance trpping),
- short-circuit withstand capacity of the installation (Isc).
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E.g. the best disconnection circuit breaker for a breaking capacity of 15kA and Imax of 40kA is a C60H.
Newt page: Install an overvoltage protection
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