The Siemens 6SL3000-0CE21-6AA0 is a SINAMICS line reactor designated as a spare part for the 16 kW Smart Line Module. It sits on the input side, handling 380-480 V 3AC at 50/60 Hz, sized for that module's power stage.
This part carries a mature lifecycle stage, meaning it's no longer in active new-production runs. The last documented revision on the datasheet is dated 21.01.2021.
The 16 kW rating matches the Smart Line Module's continuous output; the reactor limits harmonic distortion and inrush current on the DC link. If you're swapping into an existing SINAMICS S120 cabinet, verify the mechanical footprint matches the mounting plate — this is a spare part, not a universal retrofit.