What it does in the assembly
The Siemens 3RA1932-2C is a mechanical connector set for SIRIUS contactor assemblies sized S2 and S3, designed specifically for reversing configurations where two contactors mount side-by-side with zero clearance between them. The kit includes two mechanical connectors that link the contactor moving contacts to create a mechanically interlocked reversing pair — one connector per contactor, both needed for a single reversing combination.
Lifecycle status and replacement path
This part is a phased-out product. The manufacturer lists the successor as the SIRIUS 3RA2 series, with the preferred successor type being the 3RA2 family. For a reversing assembly on S2/S3 contactors, the 3RA2-series mechanical interlock is the direct replacement to specify into the BOM.