The Siemens 3RT1946-7A is an arc chute for 3-pole contactors, sized for the S3 frame. It's a phased-out product; the official successor is the SIRIUS 3RT2 series.
Sourcing and lifecycle
Lifecycle stage is listed as current, but the part is explicitly marked as phased-out — the documentation from March 2021 notes this. For new designs or BOM replacements, the successor SIRIUS 3RT2 arc chute is the direct swap.
What it fits
This arc chute mounts onto S3-frame contactors in the SIRIUS 3RT1 family. It's a replacement part for existing installations — not a new-design component.