What it is and what the key ratings mean
The Siemens 3RT1926-2PA11 is a SIRIUS pneumatic delay block — a slow-operating timing relay that snaps onto 3RT1.2 contactors. The adjustable pickup delay spans 1 to 60 seconds, set via a pneumatic timing mechanism. This is a field-adjustable delay-on-make block, meaning it holds off the contactor's pickup for the set interval after the coil is energized, then lets the contactor close. It carries 1 NO + 1 NC auxiliary contact set, wired through screw-type terminals.
Deployment context
This block snaps directly onto a SIRIUS 3RT1.2 contactor frame, so it integrates into the same DIN-rail footprint as the contactor. No additional wiring for the timing function — the delay block mechanically couples to the contactor and uses the contactor's own auxiliary contacts. The screw-type terminals match standard panel wiring practice for control circuits.