What this card does
The 6SL3357-3AG41-3AA0 is a spare Interface and Protection (IPD) card for a SINAMICS S120 liquid-cooled Active Line Module rated at 1400 kW on 500–690 V three-phase AC, 50/60 Hz, drawing 1270 A. It is the control and protection interface between the line module and the drive control unit — if this card fails, the module won't start or communicate.
What to expect when ordering
Because this is a made-to-order spare, lead time is not off-the-shelf. The card is a direct replacement for the existing IPD slot in the liquid-cooled ALM frame; no wiring or firmware changes are required if swapping a failed unit. Verify the module's serial number range against Siemens service documentation — early frames may use a different revision.