The Siemens 3RT5944-5BF41 is a SIRIUS magnet coil, 110 V DC rated, for size S3 contactors with screw-type connections. It replaces a failed coil on a SIRIUS S3 power contactor without removing the contactor from the DIN rail.
What the 110 V DC rating means for fit
The coil is wound for a 110 V DC control supply. That's a common voltage in industrial DC control buses, but it is specific — if your panel runs 24 V DC or 48 V DC control, this coil will not pull in reliably.
That means Siemens has not flagged this order code for phase-out or last-time-buy as of the latest data. It remains available through the standard SIRIUS distribution channel.
Panel integration — size S3 footprint
This coil mounts onto any SIRIUS size S3 contactor frame. The screw terminals accept 2x (2.5... 16 mm²) solid or stranded wire.