Siemens SINAMICS S120 Equipment Manual page 305

EN 60204-1, Section 14, can be used to determine the overcurrent protection devices.
Circuit-breakers from the Siemens NSK catalog are recommended as overcurrent protection
devices on the primary side, and miniature circuit-breakers or SITOP select 6EP1961-2BA00
as overcurrent protection devices on the secondary side. The MCBs can be selected
according to Siemens catalog "BETA Modular Installation Devices - ET B1".
The 24 V DC connection of the
• Line Modules
• Motor Modules
• DC link components
Is realized via the integrated busbars. The current carrying capacity of these busbars is 20 A.
The supply can be realized in two ways:
1. When a Current Supply Module is used, the 24 V supply can be directly established
Figure 8-1
2. When using an external 24 V power supply, (e.g. SITOP), the 24 V terminal adapter must
Equipment Manual for Booksize Power Units
Equipment Manual, (GH2), 03/2006 Edition, 6SL3097-2AC00-0BP3
through the busbars. The electronic current limiting function integrated in the Control
Supply Module protects the busbar system when a fault occurs. Additional loads can be
connected through the 24 V terminal adapter.
Example, 24 V supply using the Control Supply Module
be used. Miniature circuit-breakers are recommended as overcurrent protective device for
cables and busbars. The ground potential M must be connected to the protective
conductor system (PELV).
Cabinet Configuration and EMC Booksize
8.3 24 V DC supply voltage
8-9