The Siemens SIRIUS 3RT5935-5AN21 is a replacement magnet coil for contactors, rated 24 V AC at both 50 Hz and 60 Hz, with a rated control supply voltage of 220 V at 50/60 Hz. It's the coil you swap when the original opens or the winding shorts — no need to replace the whole contactor frame.
The 24 V AC coil draws a holding power of 8.4 V·A and a pick-up power of 64 V·A (inductive power factor 0.72 closing, 0.24 holding). That pick-up surge matters for transformer sizing on the control circuit — a 50 VA control transformer might drop voltage on inrush if the coil shares the circuit with other loads. The 220 V rated value at 50/60 Hz is the coil's insulation and operating voltage class, not the control voltage; the coil itself is wound for 24 V AC.