The Siemens SIRIUS 3RH1140-2AK60-1AA0 is a size S00 auxiliary contactor delivering 4 normally open instantaneous contacts with no delayed or lagging switching. Rated for 10 A at 24 V and 6 A at 230 V, it handles the signal-level and pilot-duty switching typical in control panels — interlocking, status feedback, or extending a PLC's digital output capacity. The 6 kV surge voltage rating means it withstands the transients common in industrial environments without failing short.
The 45 mm width and 73 mm depth fit the SIRIUS S00 footprint, so it occupies the same slot as other S00 contactors and auxiliary blocks. Standing on a horizontal mounting surface is the specified orientation; the IP20 front keeps fingers and tools out of the live terminals inside the enclosure.
Four instantaneous NO contacts with no make-before-break or delayed switching. The contact reliability spec — one incorrect switching operation per 100 million operations at 17 V, 1 mA — means it handles low-energy signals from PLC outputs or sensors without the oxidation failures that plague general-purpose relays at dry-circuit levels. Rated currents drop with voltage: 10 A at 24 V, 1 A at 110 V, 0.27 A at 220 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. The 50 Hz and 60 Hz operating ranges cover both 50 Hz and 60 Hz supply systems.
Solid conductors from 0.25 to 2.5 mm² are accepted per terminal. The product extension for auxiliary switches is supported, so additional contact blocks can be stacked on the same S00 frame if the four NO contacts aren't enough. Typical mechanical life for this contactor size is 30 million operations.