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.
Sourcing and fit
The coil mounts onto the SIRIUS Size S2 contactor frame, which itself snaps onto a 35 mm DIN rail per EN 50022 — typical for panel integration in motor control centers and distribution boards. 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.