A-26 – Siemens Automation System S7-400 User Manual
Page 194
Assembling and Installing Systems
A-26
Automation System S7-400 Hardware and Installation
A5E00850741-01
Low-Voltage Protection 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
Table A-4
Low-Voltage Protection Components for Lightning Protection Zones 1 <--> 2
Ser.
No.
Cables for ...
... equip transition point 1 <--> 2 with:
Order No.
1
3-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
1 piece of
DEHNgap C N-PE surge N to PE 900 131*
AC TN-S system
2 pieces of DEHNguard 275 surge arresters
900 600*
5SD7 030
AC TN-C system
1 piece of
DEHNguard 275 surge arresters
900 600*
5SD7 030
AC TT system
1 piece of
DEHNguard 275 surge arresters
phase L to N
900 600*
5SD7 030
1 piece of
DEHNgap C, N-PE surge
arrester, N to PE
900 131*
2
24 VDC Power Supply
1 piece of
Blitzductor VT lightning
conductor, type AD 24 V
918 402*
3
Bus cable
• MPI RS 485
• Blitzductor CT surge arrester,
type MD/HF
919 506* and
919 570*
• RS 232 (V.24)
1 piece of
• per conductor pair
surge arrester Blitzductor CT
type ME 15 V
919 506* and
919 522*
4
Inputs of digital modules 24
VDC
1 piece of
Low-voltage surge arrester,
type FDK 2 60 V
919 993*
5
Outputs of digital modules 24
VDC
1 piece of
Low-voltage surge arrester
FDK 2D5 24
919 991*
6
Inputs/outputs of digital
modules
2 pieces of Surge arresters
• 120 VAC
• DEHNguard 150
900 603*
• 230 VAC
• DEHNguard 275
900 600*
7
Inputs of analog modules up
to 12 V +/--
1 piece of
Surge arrester
Blitzductor CT type MD 12 V
919 506* and
919 541*
* You can order these components directly at:
DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str. 1
D-92318 Neumarkt