Components of the application example
The following table explains the components of the application example.
Table A-34 Components for overvoltage protection of the application example
Consecutive num‐
ber from the g‐
ure
Component Meaning
① Overvoltage suppressors 24 V supply:
DEHNguard DG S 75 FM
Article number 952 091* **
DEHNgap DGP C S FM
Article number 952 035* **
Comb rail MVS 1 2
Article number 900 617* **
Pin terminal STAK 2x16
Article number 900 589* **
Protection against indirect lightning eects and
overvoltages at zone transition 0
B
to 1 and 1 to
2
② Overvoltage suppressors PROFIBUS RS 485-IS lightning
conductor base part BXT BAS EX,
article number 920 301**
Blitzductor module BXT ML2 BD HF EX 6,
Article number 920 538**
Protection against indirect lightning eects and
overvoltages at zone transition 0
B
to 1 and 1 to
2
③ Overvoltage suppressor I/Os, depending on the number
of double cores used
Blitzductor base part BXT BAS EX,
Article number 920 301**
Blitzductor module BXT ML4 BD EX 24,
Article number 920 381**
Protection against indirect lightning eects and
overvoltages at zone transition 0
B
to 1 and 1 to
2
④ Additional terminal for the shield connection of the bus
line
Discharging of interference currents
⑤ Equipotential-bonding cable 16 mm
2
Cu Standardization of reference potentials
⑥ Equipotential-bonding cable 6 mm
2
Cu Discharging of interference currents
* These components are designed for non-hazardous zones. If these units are installed in hazardous area Zone 1, the com‐
ponents must be installed in a certied Ex d enclosure (ameproof encapsulated). For further information and purchase,
contact:
Siemens AG
DF FA SE
Breslauer Straße 4
90766 Fürth
** Direct purchase of components via:
DEHN + SÖHNE GmbH + Co. KG
Hans-Dehn-Str. 1
D-92318 Neumarkt
http://www.dehn.de (https://www.dehn.de)
Appendix
A.5 Lightning and overvoltage protection
ET 200iSP
450 Operating Instructions, 11/2022, A5E00247483-AK
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