Replacement IPD card for S120 Active Line Modules
The 6SL3353-3AG35-8AA0 is a Siemens SINAMICS S120 replacement IPD (Interface & Protection Device) card designed specifically for air-cooled Active Line Modules. This is not a standalone drive but a field-replaceable subassembly that sits on the line module's control interface, handling gate-drive isolation, DC-link voltage sensing, and fault monitoring for the active front end.
What this card does in the drive system
In a SINAMICS S120 cabinet build, the IPD card is the interface between the Active Line Module's power stage and the Control Unit (CU). It provides isolated gate-drive signals for the IGBTs, measures the DC-link voltage for the closed-loop regulation, and trips the module on overvoltage or desaturation faults. Without this card, the line module cannot communicate with the drive controller or regulate the DC bus.