Siemens SIMATIC ET200SP PS 6EP7133-6AB00-0BN0 24 V/5 A Manual page 42

Applications
9.1 Parallel connection to increase the power rating
NOTICE
Protective circuit for the parallel connection of more than two power supplies
When connecting more than two power supplies in parallel, additional measures must be
taken to prevent high reverse currents in the event of a secondary device fault. For this
purpose, a suitable protective circuit (e.g. decoupling diode or DC-capable circuit breaker)
must be installed between each "+" terminal of the power supply and the common
connection point.
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SIMATIC ET200SP PS
Manual, 03.2018, A5E43207434