It provides 2 normally open (NO) instantaneous contacts, wired via screw-type terminals. The 41.5 mm depth, 36.5 mm width, and 37.5 mm height keep it compact for tight enclosures.
The auxiliary contacts are rated at 0.3 A at both 24 V and 60 V — this is a low-current, signal-level rating intended for PLC inputs, contactor coils, or indicator lamps, not for power switching. Mechanical service life of 5 million operating cycles is typical for this class of auxiliary block in a contactor application, matching the expected life of the base contactor in moderate-duty cycling.
This part is flagged as a phased-out product. The official Siemens successor is the SIRIUS 3RH2911-1NF20, which is the preferred replacement. The successor shares the same S00 footprint, 2 NO contact arrangement, and screw terminal connection, so a panel designed for the 3RH1911 can typically accept the 3RH2911 without rewiring, but verify the mounting rail and wiring space match.
Wiring and terminal details
Screw-type terminals accept 2 conductors per clamp: 0.5 to 1.5 mm² or 0.75 to 2.5 mm² with core end processing, or 20 to 16 AWG and 18 to 14 AWG respectively. This covers standard control wiring for auxiliary circuits.