Siemens Simatic ET 200S Operating Instructions Manual page 84

Wiring and assembly
5.2 Operating the ET 200S on a grounded incoming supply
Components and protective measures
Various components and protective measures are specified for assembling a full installation.
The type of components and and the binding character of protective measures depends on
which DIN regulation applies to your plant. The following table refers to the figure below.
Compare ...
Disconnection element for control
system, sensors, and actuators
Short-circuit / overload protection:
In groups for sensors and actuators
Load current PS for AC power
circuits with more than five items of
electromagnetic apparatus
5-4
Refer to figure
① ... Part 460:
Main switch
② ... Part 725:
Single-pole protection of
circuits
③
② Isolation by transformer
recommended
③
DIN VDE 0100
... Part 1:
Disconnector
... Part 1:
•
•
Isolation by transformer
recommended
Operating Instructions, 12/2005, A5E00515771-03
DIN VDE 0113
With grounded
secondary circuit:
unipolar
otherwise: fuse all poles
ET 200S