Brochure/Catalogue

General installation advice
Behaviour of NH fuses for lightning surge current
(10/350 µs)
It is important to understand that the question is not how
small the SPD fusing should be; rather the maximum back-
up fuse that should be used, as the capacity of the small
fuses to carry lightning current is very limited. Unrestricted
SPD protection is only available when the installation
accommodates the maximum value.
Installation site of the lightning and surge protection products
Nominal current
and design
250 A/1
200 A/1
160 A/00
100 A/C00
63 A/C00
20 A/C00
35 A/C00
0 10 20 30 40 50 60 70 I/kA 100
25 kA 75 kA
22 kA 70 kA
9.5 kA 25 kA
5.5 kA 20 kA
4 kA 15 kA
1.7 kA 8 kA
20 kA Melting 50 kA Explosion
= Melting range = Explosion range
SPD
W
The basics of lightning and surge protection
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