The Siemens 6SL3357-3AE38-4AA0 is a replacement Interface and Protection Device (IPD) card for a SINAMICS S120 liquid-cooled Active Line Module rated at 500 kW, 380-480 V three-phase AC, 50/60 Hz, and 840 A. This is the control and protection board that manages the line-side power interface for the module — not the power stack itself, but the logic board that handles gate drive, fault detection, and the communication link to the drive controller. If you are holding this order code for a spare or a repair, you are replacing the PCB that sits between the line filter and the IGBT stack.
RoHS compliant since 01-04-18, with a REACH Article 33 declaration for lead (CAS 7439-92-1) above 0.1% w/w. The group code is R2SC and the product group is 4Q30 — these are Siemens internal classification codes that matter for BOM system traceability and cross-referencing against legacy documentation.