What it is and what it fits
The Siemens 3RT1944-5AL22 is a SIRIUS magnet coil designed for Size S3 contactors. It operates on 230 V AC control voltage at both 50 Hz and 60 Hz, drawing the listed apparent power during pick-up and holding. The spring-loaded connection terminals accept solid or ferruled stranded conductors without needing screwdriver torque — a time-saver on repetitive panel wiring.
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. For a BOM freeze or a line-down replacement, the 3RT1944-5AL22 remains available through the independent channel — quoted to order against an RFQ. No last-time-buy window is stated in the record.
Panel integration notes
Mounts onto the standard 35 mm DIN rail per EN 50022, same as the SIRIUS contactor frame. The spring-loaded terminals reduce wiring time on repetitive builds — strip to 8 mm, insert, and the cage locks. Side-by-side mounting is permitted without derating, which keeps panel fill factor tight. The IP20 front protection means it's suited for enclosed control panels only; no washdown exposure.