Magnet coil for SIRIUS Size S2 contactors
The Siemens SIRIUS 3RT1935-5AL22 is a magnet coil designed for Size S2 contactors in the SIRIUS family, with a control supply voltage of 230 V AC at both 50 Hz and 60 Hz. It uses spring-loaded connection technology for wiring, and the rated operating range at 50 Hz is 0.8... 1.1 — this is the voltage tolerance band the coil will reliably pick up and hold within.
If you are sourcing a replacement for a panel originally specified with a SIRIUS 3RT1 contactor, verify the coil voltage and size: the 3RT1935-5AL22 is the 230 V AC coil for Size S2, and the 3RT2 successor is the direct cross-reference for new orders.