The Siemens 6SL3357-3AG41-3AA7 is a spare IPD card for the SINAMICS S120 water-cooled (CuNi) Active Line Module rated at 1400 kW, 750-1035 V DC, 1422 A. This is the replacement board that goes into the line module — not the module itself, so if you are servicing a 1400 kW water-cooled ALM and the IPD card is the failed component, this is the factory spare.
For a spare part on a high-power drive system, that is the cleanest procurement posture you can get: no obsolescence urgency, no need to stockpile. The part is RoHS compliant since 01-04-18 and carries REACH disclosure for Lead CAS-No. 7439-92-1 above 0.1%.
Fit & Deployment
This card is specific to the water-cooled (CuNi) variant of the SINAMICS S120 Active Line Module — not the air-cooled version. If your line module has copper-nickel cooling tubes, this is the correct IPD. The 1422 A rating and 750-1035 V DC bus range match the 1400 kW frame.