Main earthing rail
System fuse
Back-up fuse
Back-up fuse surge protection device
Small fuses can destroyed by
energy-rich surge currents. an
upstream fuse (F1) has smaller equal value than
the maximum fuse current, separate fuse/back-up
fuse (F2) however not needed before the surge pro-
tection device. the rating the system fuse (F1) is
higher than the maximum fuse current, fuse corres-
ponding the specified maximum fuse current must
be fitted before the protection device. OBO
specifies maximum fuse rating for all devices. The pulse resistance higher-
rated fuse greater than that lower-rated one. The rating the
fuse (F2) before the protection device should as
high possible.
TBS
Blitzschutz-Leitfaden
2018
/
en
/
2020/01/10
14:42:40
14:42:40
(LLExport_02613)
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2020/01/10
14:42:54
14:42:54
199
Chapter The internal lightning protection system
.TBS
Blitzschutz-Leitfaden
2018
/
en
/
2020/01/10
14:42:40
14:42:40
(LLExport_02613)
/
2020/01/10
14:42:54
14:42:54
Back-up fuse
To provide protection case short circuits surge
protection devices, back-up fuse (F2) used
