The Siemens 3RT1944-5AK62 is a SIRIUS magnet coil for Size S3 contactors with spring-loaded connection technology.
This part is flagged as a phased-out product. The official successor is the SIRIUS 3RT2 series. For a BOM freeze or last-time-buy planning, the 3RT2 family is the drop-in replacement path.
The coil draws 0.8 to 1.1 A at 50 Hz — that's the inrush current at pickup, not the holding current. The holding VA is lower, but the pick-up surge is what stresses the control transformer. If you're replacing a coil in an existing SIRIUS Size S3 contactor, the spring-loaded terminals accept the same wire range as the original screw terminals, so no re-termination needed. The 110 V AC / 120 V AC dual-frequency rating means it works on 50 Hz or 60 Hz supply without a separate tap change.
Comparison to the 3RT1017-1AK61
The 3RT1017-1AK61 is a complete power contactor (Size S00), not just a coil. The 3RT1944-5AK62 coil will not drop into a panel wired for the 3RT1017-1AK61 without changing the contactor base and rewiring the control circuit.