The Siemens SIRIUS 3RT1924-5AV01 is a replacement magnet coil for Size S0 contactors in the SIRIUS family. It operates on a 400 V AC control supply at 50 Hz, with a screw-type terminal connection.
This part is a phased-out product. The manufacturer lists a direct successor: the SIRIUS 3RT2924-5AV01.
Key rating — what it means for fit
Rated at 400 V AC, 50 Hz, with an operating range of 0.8 to 1.1 times the rated voltage — meaning the coil will pick up and hold reliably between 320 V and 440 V AC. This tolerance covers typical line sag without dropping out the contactor.
Panel integration
The coil swaps in without removing the contactor from the rail — release the armature, unclip the old coil, slide in the replacement.