Siemens SIMATIC S7-1500 System Manual page 263

Wiring
8.2 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 8- 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
262
Reference to follow-
ing figure
① Main switch
② Single-pole protection of
circuits
IEC 60364
(DIN VDE 0100)
Disconnector
•
•
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
IEC 60204
(DIN VDE 0113)
With grounded sec-
ondary circuit: Single-
pole protection
Otherwise: All-pole
protection