The Siemens 3RT1944-5BB41 is a SIRIUS magnet coil for Size S3 contactors, a 24 V DC replacement coil with screw terminals. It's listed as a current lifecycle product, but the manufacturer's own description flags it as a phased-out part with a direct successor in the SIRIUS 3RT2 series.
What the 24 V DC rating means for fit
The 24 V DC coil rating is the control voltage that pulls the contactor in — not the main power path. If your panel's control transformer or DC power supply is already delivering 24 VDC, this coil drops straight in. The screw terminals match the Size S3 contactor's standard wiring interface, so no adapter plate or re-termination block is needed for a like-for-like swap.
The screw terminals accept the same wiring as the parent contactor's control circuit.