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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
12-23
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For the transition points between lightning protection zones 1 <-> 2 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 12-9 Surge voltage protection components for lightning protection zones 1 <-> 2
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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
Surge arrester Blitzductor
CT type ME 15 V
919 506* and
919 522*
4 Inputs of digital modules
DC 24 V
1 x Low-voltage surge arrester
, type FDK 2 60 V
919 993*
5 Outputs of digital
modules 24 V
1 x Low-voltage surge arrester 919 991*
Inputs/outputs of digital
modules
2 x Surge arrester
• 120 VAC • DEHNguard 150 900 603*
6
• 230 VAC • DEHNguard 275 900 600*
7 Inputs of analog
modules up to 12 V +/-
1 x Blitzductor CT surge arrester,
type MD 12 V
919 506* and
919 541*
* 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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