{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-2NL40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-2NL40","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-2NL40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2NL40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH2911-2NL40, 4 NO instantaneous contacts (one solid-state compatible), spring-loaded terminals, snap-on mounting for contactor sizes S00, S0, S2, S3, IP20 front protection.","salesMarkdown":"The Siemens 3RH2911-2NL40 is a front-mounted auxiliary switch block for the SIRIUS contactor family, delivering four normally-open instantaneous contacts — one of which is explicitly rated as solid-state compatible. That matters when you're switching PLC inputs, thin-film sensors, or signal-level loads where standard silver-alloy contacts can't reliably wet the circuit. The contact reliability spec backs this up: one incorrect switching operation per 100 million cycles at 5 V, 1 mA, which is the kind of low-energy signal a solid-state input presents. Wiring lands on spring-loaded terminals accepting 2x (0.5 to 2.5 mm²) solid or stranded, or 2x (20 to 14 AWG). No screw torque to check, no loosening from vibration — the cage clamp holds through the 5 million mechanical operating cycles typical service life. The block snaps onto contactor sizes S00, S0, S2, and S3 without tools, so it's a straight retrofit across a mixed panel. ## Integration notes Snap-on mounting onto the contactor front face — no DIN rail required, no additional bracket. The block adds 47.7 mm depth and 36 mm width to the contactor envelope; verify clearance inside shallow enclosures. Front protection is IP20 — finger-safe but not washdown-rated. ## Delta: 3RH2911-2NL40 vs. 3RH2131-2AK60 The 3RH2131-2AK60 is a full auxiliary contactor (3 NO + 1 NC, AC coil, screw and snap-on mount), not a bolt-on switch block. It occupies its own DIN-rail footprint at 73 mm depth × 45 mm width and requires its own coil power. The 3RH2911-2NL40 is a contactor accessory — it rides on the contactor face, draws no coil current, and adds only 47.7 mm depth. If your panel was laid out around a 3RH2131-2AK60, the 3RH2911-2NL40 will not drop in as a direct swap; the mounting method and wiring scheme are fundamentally different. The 3RH2911-2NL40 is the right choice when you need extra NO contacts on an existing contactor without adding a separate device to the rail.","metaTitle":"Siemens 3RH2911-2NL40 Auxiliary Switch, 4 NO, Spring-Loaded,","metaDescription":"Siemens SIRIUS 3RH2911-2NL40 auxiliary switch block with 4 NO contacts (1 solid-state compatible), spring-loaded terminals, snap-on for S00-S3 contactors. 690 V insulation, 6 kV su","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"47.7 mm","Width":"36 mm","Height":"41.5 mm","at 24 V":"0.3 A","at 48 V":"0.3 A","at 60 V":"0.3 A","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"0","Size Of Contactor":"S00, S0, S2, S3","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Suitability For Use":"power contactor","Instantaneous Contact":"4","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Contact Reliability Of Auxiliary Contacts":"one incorrect switching operation of 100 million switching operations (5 V, 1 mA)","mirror contact according to IEC 60947-4-1":"No","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","Mechanical Service Life (Operating Cycles) Typical":"5 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","number of CO contacts of auxiliary contacts instantaneous contact":"0","AWG number as coded connectable conductor cross section for auxiliary contacts":"20 ... 14"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1f37d667b1fc9bfc41aa91c6b4d1b29f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1458574&mlfb=3RH2911-2NL40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2911-2NL40/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RH2911-2NL40 used for?","answer":"It is a front-mounted auxiliary switch block for SIRIUS contactors, providing four NO contacts — one solid-state compatible — for signaling, PLC inputs, or interlocking circuits. It snaps onto contactor sizes S00, S0, S2, and S3."},{"question":"How do I get pricing and availability for 3RH2911-2NL40?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What wire sizes does the spring-loaded terminal accept?","answer":"The terminal accepts 2x (0.5 to 2.5 mm²) solid or stranded, 2x (20 to 14 AWG), and 2x (0.5 to 1.5 mm²) finely stranded with core end processing."},{"question":"Can 3RH2911-2NL40 replace 3RH2131-2AK60?","answer":"No. The 3RH2131-2AK60 is a standalone auxiliary contactor with its own coil and DIN-rail mount (73 × 45 mm). The 3RH2911-2NL40 is a contactor-mounted accessory that adds NO contacts to an existing contactor. They are not footprint- or wiring-compatible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-2NL40","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RH2911-2NL40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}