Siemens SIMATIC S7-1500/ET 200MP System Manual page 157

Wiring
7.3 Operation on grounded infeed
Short-circuit and overload protection
Various measures as protection against short-circuits and overloads are required for setting
up a full installation. The nature of the components and the degree to which the required
measures are binding depends on the IEC (DIN VDE) regulation applicable to your plant
configuration. The table refers to the following figure and compares the IEC (DIN VDE)
regulations.
Table 7- 1 Components and required measures
Shut-off device for control system, sen-
sors, and actuators
Short-circuit and overload protection:
In groups for sensors and actuators
Load power supply for AC load circuits
with more than five items of electromag-
netic equipment
156
Reference to follow-
ing figure
① Main switch
② Single-pole protection of
circuits
③
④ Galvanic isolation by trans-
former recommended
IEC 60364
(DIN VDE 0100)
Disconnector
•
•
Galvanic isolation by trans-
former recommended
System Manual, 01/2023, A5E03461182-AK
IEC 60204
(DIN VDE 0113)
With grounded sec-
ondary circuit: fuse
unipolar
Otherwise: fuse all
poles
Automation system