It uses spring-loaded terminals for the auxiliary and control circuit connections, accepting 2x (0.5 to 2.5 mm²) without core-end processing or 2x (0.5 to 1.5 mm²) with ferrules.
At 24 V it carries 10 A in AC-15 duty (solenoid/contactor coil loads), and at 230/250 V it handles 6 A. For DC switching at 24 V it's rated 6 A, dropping to 0.3 A at 220 V and 0.26 A at 600 V. The AC-15 rating at 690 V is 1 A. These numbers govern what pilot devices or contactor coils you can switch — match the load voltage and type to the appropriate column.
Lifecycle reality — phased out, successor known
This 3RH1911-2FA02 is a phased-out product. The official Siemens successor is the SIRIUS 3RH2 series, with preferred successor type 3RH2911-2HA02. If you're maintaining an existing panel, this block is still serviceable through independent distribution. For new builds or BOM refreshes, the 3RH2911-2HA02 is the drop-in path — same S00 footprint, same 2 NC configuration, spring-terminal variant.
Snap-on mounting onto size S00 contactors or contactor relays. The block measures 36.5 mm wide, 46 mm deep, and 37.5 mm high. Front protection is IP20 — suitable for enclosed panels, not for washdown areas. Mechanical service life is 10 million switching cycles typical. Contact reliability is specified as one incorrect switching operation per 100 million at 17 V, 1 mA, which covers low-energy signal circuits.