What this part is and what it fits
The Siemens 3RT1944-5BW41 is a SIRIUS magnet coil designed for Size S3 contactors, with a 48 V DC control supply voltage and screw-type terminals. This coil is the replacement component for the contactor's solenoid — if the coil fails on a 3RT1 S3 contactor in the field, this is the drop-in spare. The screw terminal connection matches the existing wiring scheme on the contactor base.
Lifecycle and sourcing reality
For a BOM line that already carries the 3RT1944-5BW41, this coil is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for the exact quantity and delivery window.
Panel integration note
The coil mounts onto the Size S3 contactor frame, which itself snaps onto 35 mm DIN rail per EN 50022. The screw terminals accept 2x (0.5...1.5 mm²) solid or 2x (0.75...2.5 mm²) stranded — standard control wiring. No special tooling needed beyond a screwdriver.