Assembling and Installing Systems
A-26 AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
Low-VoltageProtection Elements for 1 < --> 2

For the transition points between lightning protection zones 1 <-->2 we

recommend the surge protection components listed in table A-4

TableA-4 Low-VoltageProtection Components for Lightning Protection Zones 1 < -->2
Ser.
No.
Cablesfor ... ... equiptransition point 1 < -->2 with: OrderNo.
13-phase TN-C system 3 pieces of DEHNguard 275 surge arresters 900 600*
5SD7 030
3-phase TN-S system 4 pieces of DEHNguard 275 surge arresters 900 600*
5SD7 030
3-phase TT system 3 pieces of DEHNguard 275 surge arresters
phase L1/L2/L3 to N 900 600*
5SD7 030
1pieceof DEHNgapC N-PE surge N to PE 900131*
AC TN-S system 2 pieces of DEHNguard 275 surge arresters 900 600*
5SD7 030
AC TN-C system 1pieceof DEHNguard275 surge arresters 900 600*
5SD7 030
AC TT system 1pieceof DEHNguard275 surge arresters
phase L to N 900 600*
5SD7 030
1pieceof DEHNgapC, N-PE surge
arrester,N to PE 900 131*
224 VDC Power Supply 1pieceof BlitzductorVT lightning
conductor,type AD 24 V 918 402*
3Bus cable
•MPI RS 485 •Blitzductor CT surge arrester,
type MD/HF 919 506* and
919 570*
•RS 232 (V.24) 1pieceof •perconductor pair
surge arresterBlitzductor CT
type ME 15 V 919 506* and
919 522*
4Inputs of digital modules 24
VDC 1pieceof Low-voltagesurge arrester,
type FDK 2 60 V 919993*
5Outputs of digital modules 24
VDC 1pieceof Low-voltagesurge arrester
FDK 2D5 24 919 991*
6Inputs/outputs of digital
modules 2 pieces of Surge arresters
•120 VAC •DEHNguard 150 900 603*
•230 VAC •DEHNguard 275 900 600*
7Inputs of analog modules up
to12 V +/-- 1pieceof Surgearrester
BlitzductorCTtypeMD12V 919506* and
919 541*
* Youcan order these components directly at: DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str.1
D-92318 Neumarkt