This block carries a maximum thermal current of 10 A, with AC-15 switching capacity rated at 1 A at 690 V.
The 3RH1911-1FA02 is a phased-out product. The official Siemens preferred successor is the 3RH2911-1HA02, which is the current-production SIRIUS 3RH2 series auxiliary switch block with the same contact configuration (2 NC) and screw terminals.
The switching capacity is voltage-dependent: at 24 V it handles 6 A, at 125 V it handles 6 A, at 230 V it handles 6 A, and at 400 V it handles 3 A. The rated operational current at 24 V is 10 A, dropping to 0.26 A at 600 V. These figures define the maximum load the contacts can break under inductive (AC-15) or general-use conditions — a critical check when replacing the block in an existing panel to ensure the contact rating matches the pilot duty or control transformer load. Front-side protection is IP20, meaning it is touch-safe but not sealed against moisture or dust ingress. Wiring is via screw-type terminals accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with ferrule, or 2x (20 to 16) and 2x (18 to 14) AWG. The block dimensions are 41.5 mm deep, 36.5 mm wide, and 37.5 mm high — the S00 footprint that mates directly with SIRIUS contactors in that frame size.