Auxiliary Switch Block for SIRIUS Contactors – Phased Out, Successor Identified
The Siemens 3RH1911-1FA22-ZX95 is a SIRIUS auxiliary switch block with a 2 NO + 2 NC contact configuration, designed for snap-on mounting onto contactor relays and power contactors of the 3RH1 series. It uses screw-type terminals and is rated for a maximum of 10 A, with a mechanical service life of 10 million switching cycles typical. The part is noted as a phased-out product with the successor being the SIRIUS 3RH2 series.
Current Ratings Across Voltages – What They Mean for Your Circuit
The block carries a maximum thermal current of 10 A, but the real switching capacity depends on the voltage and duty. At 24 V DC it switches 6 A, at 125 V DC it handles 6 A, and at 230 V AC it also manages 6 A. For higher DC voltages the rating drops sharply — 0.3 A at 220 V DC and 0.26 A at 600 V DC. The AC-15 rating at 690 V is 1 A. These numbers define the actual load you can break, not just carry — important when selecting for a DC control circuit or an AC auxiliary contactor application.
Snap-On Mounting and Panel Integration
The block snaps onto the contactor without tools — no additional DIN-rail space needed. Dimensions are 36.5 mm wide, 37.5 mm high, and 41.5 mm deep, fitting the S00 contactor footprint. Screw terminals accept 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²) with core end processing, or 2x (20...16) and 2x (18...14) AWG. IP20 on the front means it's protected against finger contact but not washdown — standard for enclosed panel mounting.
Lifecycle Reality – Phased Out, Successor Available
This part is marked as a phased-out product. The official successor is the SIRIUS 3RH2 series. For a BOM line that requires the 3RH1911-1FA22-ZX95, the 3RH2 series is the drop-in functional replacement — same contact arrangement (2 NO + 2 NC), similar current ratings, and the same snap-on mounting principle, though the physical dimensions and terminal layout differ. The 3RH1911-1FA22-ZX95 remains available through independent distribution; sourcing is quoted to order against an RFQ, with availability and current pricing confirmed at quote time.