The Siemens SIRIUS 3RT1934-5BW41 is a 48 V DC magnet coil for Size S2 contactors, terminated with screw terminals. It is the replaceable coil assembly that energizes the contactor's armature.
The coil is rated for 48 V DC — this is the nominal pick-up and hold voltage. The Size S2 designation matches the contactor frame it fits.
Deployment context
This coil is used inside a control panel on a DIN-rail-mounted SIRIUS contactor. The 48 V DC control voltage is less common than 24 V DC, so verify the control transformer or power supply before specifying. The coil's DC rating means it has built-in suppression for the inductive kickback — but for long cable runs, a free-wheeling diode across the coil terminals is still good practice to protect the PLC output driving it.