What this SIRIUS auxiliary switch does
The Siemens 3RT1926-2GD51 is a solid-state auxiliary switch from the SIRIUS product family — it clips onto a contactor to add a timed auxiliary contact function, typically used in star-delta starting circuits or delayed switching sequences where a mechanical timer contact would wear or drift. Its adjustable time range runs from 1.5 to 30 seconds, set via a trimmer on the front face, and the recovery time between cycles is 150 ms — meaning the switch resets fast enough for repeated start sequences on a conveyor or pump station.
Coil voltage and contact ratings that govern the fit
The auxiliary contact is rated 3 A maximum, with specific switching capacities of 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V — these are the limits for pilot-duty loads like PLC inputs, contactor coils, and indicator lamps; the 3 A ceiling governs the load circuit, not the coil.