What it is and where it fits
The 3RT1935-5AK62 is a SIRIUS magnet coil designed for Size S2 contactors, with a spring-loaded connection terminal. It's the replaceable coil assembly that pulls in the contactor's main and auxiliary contacts when energized. Rated for 110 V AC at 50 Hz and 120 V AC at 60 Hz, this coil draws a holding current in the 0.8 to 1.1 A range at 50 Hz. That's the steady-state current the contactor's control transformer or PLC output must supply once the contactor is sealed in.
What the key ratings mean for fit
The 0.8 to 1.1 A at 50 Hz figure is the inrush or holding current the coil draws. For a panel-builder or MRO planner, that tells you the control transformer VA rating needs headroom above this draw — especially during inrush, which can be several times the holding current for a brief cycle. The spring-loaded connection accepts solid or ferruled stranded wire without needing screw tightening, which speeds up panel wiring and reduces loose-terminal callbacks.