What this part is and what it fits
The Siemens 3RT1944-5BE41 is a SIRIUS magnet coil designed for Size S3 contactors. It operates on a 60 V DC control supply and terminates via screw terminals. The coil is the replacement component for the contactor's electromagnetic actuator — when the coil fails, the contactor drops out and the controlled load loses power.
Lifecycle and sourcing reality
This part is flagged as a phased-out product. The manufacturer lists the successor as the SIRIUS 3RT2 series.