The Siemens 6SL3356-3AE41-4AA7 is a replacement Interface and Protection (IPD) card for the SINAMICS S120 water-cooled (CuNi) Motor Module rated at 800 kW, 380-480 V 3AC, 50/60 Hz, and 1405 A. This is the board that handles the drive's logic interface and protection functions inside the liquid-cooled module — not a standalone drive, but the card that keeps the module communicating and protected. It's listed as a spare part, so if you're rebuilding a water-cooled S120 cabinet or chasing a fault on a 1405 A module, this is the board you swap in.
Integration Note
This card mounts inside the water-cooled (CuNi) Motor Module frame — it's not a DIN-rail component. The 1405 A rating ties to the module's output current, not the card itself. When swapping the IPD card, power down the DC link and wait for the intermediate circuit capacitors to discharge per Siemens' maintenance procedure. Verify the firmware version on the replacement card matches the existing module's control unit to avoid communication mismatches.