The Siemens SIRIUS 3RT1934-5AV02 is a magnet coil for Size S2 contactors, rated 400 V AC at 50 Hz with a spring-loaded connection. This is the replacement coil for the S2 frame — if the contactor body is good and the coil failed, this is the drop-in part.
This part is flagged as a phased-out product. The official successor is the SIRIUS 3RT2 series coil. For a BOM freeze or a line-down swap, the 3RT1934-5AV02 is still sourced through independent distribution — quoted to order against an RFQ. If you're designing a new panel, spec the 3RT2 equivalent directly.