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 pulse resistance higher-
rated fuse greater than that lower-rated one. OBO
specifies maximum fuse rating for all devices.
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
199
Chapter The internal lightning protection system
.
Main earthing rail
System fuse
Back-up fuse
Back-up fuse surge protection device
Small fuses can destroyed by
energy-rich surge currents.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. The rating the
fuse (F2) before the protection device should as
high possible. 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
