What this is and what it fits
The Siemens 3RT1934-5BM41 is a SIRIUS magnet coil designed for Size S2 contactors, with a screw terminal connection and a 220 V DC control supply voltage. It's the replacement coil for a contactor that's lost its pull-in — you swap the coil, not the whole contactor block, when the winding opens or the DC supply changes.
Lifecycle and sourcing reality
This part is flagged as a phased-out product. The official successor is the SIRIUS 3RT2 series coil — same Size S2 footprint, same screw terminal pattern, but the 3RT2 generation. If you're holding a BOM line that calls out 3RT1934-5BM41, you have two paths: source the phased-out original through independent distribution (we can quote it against an RFQ), or re-qualify the 3RT2 successor and update your panel documentation. No drop-in guarantee between generations without checking the mounting and electrical interface.
What the 220 V DC rating means on the line
220 V DC is the rated control voltage — the coil is designed to pull in and hold reliably at that DC level. On a DC control bus, voltage drop across long cable runs matters more than with AC; verify the actual voltage at the coil terminals under load stays above the minimum pick-up threshold (typically around 0.85 x rated for DC coils in the SIRIUS family). If your panel runs a 220 V DC bus that sags below ~187 V during simultaneous pick-up of multiple contactors, this coil may chatter or fail to seal.
Panel integration note
Screw terminal connection — strip and torque per the contactor's terminal specification. The coil mounts directly onto the Size S2 contactor yoke; no additional hardware needed. If you're replacing a failed coil on an existing SIRIUS S2 contactor, the 3RT1934-5BM41 is the direct form-fit-function match for the 220 V DC variant. Verify the contactor's rated operational current and utilization category (AC-3, AC-4) haven't changed with the coil swap — the coil doesn't affect the main pole ratings.