The Siemens SIRIUS 3RT1924-5AG22 is a replacement magnet coil for Size S0 contactors in the SIRIUS family. It operates on 110 V AC control voltage at both 50 Hz and 60 Hz, drawing 0.8... 1.1 A at 50 Hz. The coil uses spring-type terminals for the control wiring, which speeds up panel assembly compared to screw terminals.
Lifecycle and Sourcing Reality
This part is a phased-out product. The official successor is the SIRIUS 3RT2 series. For existing panels with Size S0 contactors that need a coil replacement, the 3RT1924-5AG22 is sourced through surplus and broker channels against an RFQ. Verify the mounting footprint and terminal arrangement of the 3RT2 successor.
What the Ratings Mean for Fit
The 0.8... 1.1 A at 50 Hz is the coil's inrush current range — the higher value is the pick-up current when the contactor pulls in, and the lower is the holding current once sealed. A control transformer supplying this coil must be sized for the 1.1 A peak, not the steady-state draw. The 110 V AC rating at both 50 and 60 Hz means the coil works on either supply frequency without derating, which simplifies stocking for plants with mixed-frequency zones.
Panel Integration
The coil snaps onto the Size S0 contactor body. Spring-type terminals accept solid or ferruled stranded wire — strip to the length specified in the contactor's wiring diagram. No additional DIN-rail space is consumed; the coil mounts directly on the contactor's magnet stack.