The SIEMENS 6SL3520-0XA61-1AF0 is a radio interference suppression filter for Category C2, rated for 3AC 380-480 V. It sits between the line supply and a SINAMICS drive or power supply, attenuating conducted emissions so the system meets EMC limits for industrial environments. The C2 classification means it is intended for fixed-installation drives in the first or second environment (industrial or light-industrial) where the supply is a dedicated transformer or building feed — not for residential or public low-voltage networks.
The lifecycle stage is mature. The design is stable and the part has been in production long enough that supply is predictable. Sourcing this part is straightforward through independent distribution.
What the Category C2 rating means for your EMC plan
Category C2 per EN 61800-3 defines the conducted and radiated emission limits for a drive system installed in the second environment (industrial) or the first environment (light-industrial) with a dedicated supply transformer. In practice, a C2 filter like this one lets you commission a SINAMICS drive in a factory hall without additional external filtering, provided the cable lengths and motor shield terminations follow the installation guidelines. It does not cover residential or public-grid connections — that would require a C1 filter. If your site has a TN or IT system, verify the leakage current against the RCD type upstream; C2 filters typically have higher leakage than C1.