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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
12-24 A5E00105492-03
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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 12-10 Surge voltage protection components for lightning protection zones 2 <-> 3
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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 DEHNgap C, N-PE surge
arrester, 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 DEHNguard 275
surge arrester, phase L to N
900 600*
5SD7 030
1
AC TT system
1 x DEHNgap C, N-PE surge
arrester, 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 conductor pair
low-voltage surge protection
FDK 2 12 V
919 995*
Inputs of digital modules
• 24V DC 1 x Low voltage 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 protection
, type FDK 2 12 V, on insulated
rail connected with M- of the
power supply for the modules.
919 995*
* You can order these components directly from:
DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str. 1
D-92318 Neumarkt
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