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BETA Protecting
Overvoltage Protection Devices
Configuration
6/30
Siemens ET B1 · 10/2008
6
*
You can order this quantity or a multiple thereof.
Selection of overvoltage protection devices
Situation
Systems
Basic protection
Which type of building do you
want to protect?
Generally speaking, all our
devices are suitable for
residential buildings, office
buildings, industrial and
commercial buildings.
For installation upstream of counters in main distribution boards
or in combined main/sub-distribution boards
Low risk buildings
-
No outer lightning protection
-
Power supply
over ground conductor
TN-S and TT systems
Surge arresters, type 2
Narrow design
5
SD7 424-0, 5SD7 424-1
Wide design
5
SD7 464-0, 5SD7 464-1
With or without remote signaling
TN-C systems
Surge arresters, type 2
Narrow design
5
SD7 423-0, 5SD7 423-1
Wide design
5
SD7 463-0, 5SD7 463-1
With or without remote signaling
High-risk buildings
-
Outer lightning protection
system
-
Power supply
over overhead lines
-
Grounded aerial built-on
accessories
TN-S and TT systems
Lightning arresters, type 1
5
SD7 414-1
With remote signaling
TN-C systems
Lightning arresters, type 1
5
SD7 413-1
With remote signaling
5
SD7411-1
TN-S and TT systems
Combination surge arresters, type 1 and type 2
5
SD7 444-1
With remote signaling
TN-C systems
Combination surge arresters, type 1 and type 2
5
SD7 443-1
With remote signaling
5
SD7441-1
IT systems
without N-conductor incorporated in the
cable
Typically, IT systems are only installed in special
building sections. There are generally still TN-C,
TN-S or TT systems in the area of the main
distribution board. In this case, the protective
devices shown above must be installed.
IT systems
with N-conductor incorporated in the
cable
© Siemens AG 2008