What this card does in the drive cabinet
The Siemens 6SL3357-3AG41-6AA4 is a factory-replacement Interface and Protection Device (IPD) card for a liquid-cooled SINAMICS S120 Active Line Module rated 1700 kW at 500-690 V 3AC, 50/60 Hz, pulling 1560 A. This is the control and protection board that sits between the line-side reactor and the IGBT stack — it handles the gate drive, DC-link voltage sensing, and fault trip logic for the active front end. If this card fails, the module won't energize the DC bus.
Export and compliance notes
Export Control Regulations are AL: N / ECCN: EAR99H, so no special license is required for most destinations. REACH Article 33 duty-to-inform applies per the current candidate list — the manufacturer publishes that data separately. No UL or CSA listing is stated in the evidence, so verify local code acceptance if the panel requires third-party certification on the spare card itself.