The Siemens SIRIUS 3RT1945-5AN61 is a magnet coil for Size S3 contactors, rated 200 V AC at 50 Hz and 220 V AC at 60 Hz. It draws 0.8 to 1.1 A at 50 Hz. This is a replacement coil — you swap it into an existing S3 contactor frame, not a standalone device. The control supply is AC only.
The 0.8 to 1.1 A draw at 50 Hz tells you the coil's inrush and hold current — size your control transformer and fuse accordingly. AC coil means no polarity concerns, but you do need to verify the control voltage matches your panel's supply; a 24 V DC coil won't work here.
Panel Integration
Screw terminal connection, Size S3 contactor frame. Mounts on DIN rail via the contactor base. The coil plugs onto the contactor magnet stack — no wiring changes to the main power circuit.