The Siemens 3RT1944-5AL22 is a SIRIUS magnet coil designed for Size S3 contactors.
Sourcing reality — phased out, successor available
This coil is a phased-out product per the manufacturer. The official successor is the SIRIUS 3RT2 series, which uses the same Size S3 mechanical platform and spring-loaded connection layout. No last-time-buy window is stated in the record.
The spring-loaded terminals reduce wiring time on repetitive builds — strip to 8 mm, insert, and the cage locks. The IP20 front protection means it's suited for enclosed control panels only; no washdown exposure.