The Siemens SIRIUS 3RT1934-5AH21 is a magnet coil for Size S2 contactors in the SIRIUS family. It is rated for 48 V AC control supply voltage at both 50 Hz and 60 Hz, with a pickup power range of 0.8... 1.1 (likely VA or A, per the spec entry). The coil terminates via screw terminals, matching the standard connection method for SIRIUS Size S2 contactor bases. This is a phased-out product; the official successor is the SIRIUS 3RT2 series.
The manufacturer lists the lifecycle stage as current, but the description explicitly marks this as a phased-out product with a defined successor: the SIRIUS 3RT2 series. For a buyer with an active BOM line, this means the 3RT1934-5AH21 is no longer in regular factory production. The successor 3RT2 coil should be verified for mechanical and electrical interchangeability before a design-in.