The Siemens SIRIUS 3RT1935-5AN21 is a magnet coil designed for Size S2 contactors in the SIRIUS family. It operates on a 220 V AC control supply at both 50 Hz and 60 Hz, drawing 0.8 to 1.1 A at 50 Hz. The screw terminal connection matches the standard wiring practice for SIRIUS contactor assemblies.
The 220 V AC rating at both 50 Hz and 60 Hz means this coil is a straight swap for any SIRIUS Size S2 contactor originally specified with a 220 V AC coil. The 0.8 to 1.1 A holding current at 50 Hz is the steady-state draw after the contactor picks up; the inrush will be higher, but this is the figure for sizing the control transformer.
This coil mounts directly onto the SIRIUS Size S2 contactor frame via screw terminals. No special tools beyond a standard screwdriver are needed.