Appendix
A.3 Lightning and surge voltage protection
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
A-25
Low-voltage protection elements for 2 <-> 3
For the transition points between lightning protection zones 2 <-> 3 we recommend the
surge protection components listed in the table below. This low-voltage protection must be
used in S7-300 for CE compliance.
Table A-10 Surge-protection components for lightning protection zones 2 <-> 3
Conse
c. no.
Cables for ... ... equip transition point
2 <-> 3 with:
Order number
3-phase TN-C system 3 x DEHNguard 275 surge arresters 900 600*
5SD7 030
3-phase TN-S system 4 x DEHNguard 275 surge arresters 900 600*
5SD7 030
3 x DEHNbloc/275 surge arrester, phase
L1/L2/L3 to N
900 600*
5SD7 030
3-phase TT system
1 x N-PE surge arrester DEHNgap C
N to PE
900 131*
AC TN-S system 2 x DEHNguard 275 surge arresters 900 600*
5SD7 030
AC TN-C system 1 x DEHNguard 275 surge arresters 900 600*
5SD7 030
1 x Surge arrester DEHNguard 275
phase L to N
900 600*
5SD7 030
1
AC TT system
1 x N-PE surge arrester DEHNgap C
N to PE
900 131*
2 24 VDC power supply 1 x Blitzductor VT, type AD 24 V 918 402*
Bus cable
• MPI, RS485
• Blitzductor CT surge arrester, type
MD/HF
919 506* and
919 570*
3
• RS232 (V.24)
1 x
• per cable pair
Low-voltage surge protection FDK
2 12 V
919 995*
Inputs of digital modules
• 24 VDC
1 x Low-voltage surge protection
Type FDK 2 60 V, on insulated rail
919 993*
2 x Surge arrester
• 120 VAC
• DEHNrail 120 FML
901 101*
4
• 230 VAC
• DEHNrail 230 FML
901 100*
5 Outputs of digital modules 24 V 1 x Low-voltage protection FDK 2 D 5 24 919 991*
6 Outputs of analog modules up to
12 V +/-
1 x Low-voltage surge protection
Type FDK 2 12 V, on insulated rail
connected with M- of the power
supply for the modules.
919 995*
* Please order these components directly from:
DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str.
D-92318 Neumarkt
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