The Siemens 3RH2911-2XA22-0MA0-ZW97 is a front-mounted auxiliary switch block in the SIRIUS family, designed for use with 3RT2 contactors and 3RH2 contactor relays. It provides 2 normally-open and 2 normally-closed contacts, wired as separate current paths (53/54, 61/62, 71/72, 83/84), with spring-loaded terminals accepting 2x (0.5...1.5 mm²) with ferrules or 2x (0.5...2.5 mm²) solid. Rated for 10 A maximum, with an AC-15 rating of 1 A at 690 V — sufficient for pilot-duty control circuits in motor starters and relay logic panels.
Mounting and integration
Snap-on mounting onto the contactor or relay front — no tools needed. The block adds 36 mm width, 47.7 mm depth, and 41.5 mm height to the assembly, so check your DIN-rail fill and enclosure depth before committing. IP20 on the front face is standard for enclosed panels; not rated for washdown environments.
Switching performance and contact reliability
Mechanical service life of 10 million switching cycles, with contact reliability specified at 1 faulty switching per 100 million operations at 17 V, 1 mA — this matters for PLC-level signals where dry switching can cause oxide buildup. The surge voltage resistance of 6 kV and rated insulation voltage of 690 V AC at pollution degree 3 give it headroom for industrial environments with transient spikes.
Sourcing and lifecycle
Current production — no end-of-life notice. Standard catalog item from the SIRIUS program, supplied in multi-unit packaging of 100 pieces per pack.