What the ratings mean for fit
The 3VA1125-4ED32-0AA0-ZD00: The 36 kA breaking capacity at 415 V (class S) means this breaker can safely interrupt fault currents up to that level on a 415 V three-phase system without upstream cascading — critical for panel coordination studies. The TM210 trip unit provides thermal-magnetic protection: the thermal element handles overloads (Ir = 25 A fixed), and the magnetic element handles short-circuits (Ii = 12.8 × In, or about 320 A). Because both Ir and Ii are fixed, there is no dial to adjust; the breaker is selected for a specific load current and stays there. The 3VA1 frame 160 footprint mounts on standard DIN rail or can be panel-mounted, fitting into existing Siemens 3VA panel layouts.
Sourcing and lifecycle
Lifecycle stage is listed as current, meaning Siemens still manufactures this order code and it has not been announced for discontinuation. For a BOM line that calls out this exact variant — especially the nut keeper kit and DC Power OEM designation — the safest procurement path is to source the identical order code. We can quote this part to order against an RFQ; availability and current pricing are confirmed at quote time.