The Siemens 3RT1935-5AD01 is a SIRIUS magnet coil designed for Size S2 contactors, with a 42 V AC control supply at 50 Hz and screw-type terminals. This is the replacement coil for the contactor body — if the coil fails, you swap this, not the whole contactor. The 42 V AC coil draw is specified at 0.8... 1.1 A at 50 Hz, which is the inrush and hold current you need to budget for in the control transformer sizing.
Comparison with 3RT7036-1AH20
The closest functional peer is the 3RT7036-1AH20, also a Size S2 magnet coil with 42 V AC control voltage. The key difference: the 3RT7036-1AH20 draws 0.36 A at 50 Hz versus the 3RT1935-5AD01's 0.8... 1.1 A. That is a significant inrush current delta — the 3RT7036-1AH20 is a lower-power coil design. It will not drop into a panel wired for the 3RT1935-5AD01 without checking the control transformer capacity and the contactor's pick-up voltage under load. Same physical footprint (55 mm width, 115 mm depth, 112 mm height) and same screw-terminal mounting, but the coil characteristics differ enough that a direct swap may cause pick-up issues if the transformer is sized for the higher inrush of the original.