It snaps onto size S00 contactors and contactor relays, adding a single NC auxiliary contact to the switching assembly. Rated for a maximum of 10 A, its switching capacity varies by voltage and duty: 6 A at 24 V AC/DC, 6 A at 125 V, 6 A at 230 V, and 3 A at 400 V. At 690 V under AC-15 duty, it switches 1 A. For DC control circuits, ratings drop to 4.7 A at 60 V, 1.2 A at 220 V, and 0.26 A at 600 V. The block is rated for 6 kV surge voltage resistance and carries an insulation voltage of 690 V at pollution degree 3, meaning it's suitable for standard industrial panel environments where some conductive contamination may be present.
The 3RH1911-1BA01 is a phased-out product. The official Siemens successor is the 3RH2911-1BA01.
Integration Notes
Mounts via snap-on onto SIRIUS S00 contactors. Dimensions are 28.5 mm wide, 37.5 mm high, and 41.5 mm deep. Screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing, or AWG 2x (20 to 16) and 2x (18 to 14). Front-side protection is IP20, suitable for enclosed control panels. Mechanical service life is 10 million switching cycles typical.