{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1NF11","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1NF11","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1NF11","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1NF11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch block, 3RH2911-1NF11, 1 NO + 1 NC solid-state compatible, screw terminals, for 3RT2 contactors and 3RH2 contactor relays, IP20, 690 V insulation.","salesMarkdown":"The Siemens 3RH2911-1NF11 is a front-mounted auxiliary switch block for the SIRIUS contactor family, specifically designed to snap onto 3RT2.2/3/4 power contactors and 3RH2 contactor relays. It provides one normally-open and one normally-closed auxiliary contact, both rated for solid-state (low-energy) switching — meaning they reliably switch dry circuits down to 5 V, 1 mA, with a contact reliability of one incorrect operation per 100 million cycles. This makes the block suitable for PLC or logic-level inputs where standard silver contacts might oxide and fail. The contacts are rated 0.3 A at both 24 V and 60 V, reflecting their design for signal-level loads rather than power auxiliary circuits. The insulation voltage is 690 V AC with pollution degree 3, and surge voltage resistance is 6 kV — the same dielectric backbone as the host contactor, so no derating is needed when installed on a 400 V or 690 V motor branch. ## Mounting and fit Snap-on mounting onto the contactor front — no tools, no wiring between block and coil. The block adds 36 mm width, 43.7 mm depth, and 37.5 mm height to the assembly. Screw terminals accept 2x (0.5…1.5 mm²) or 2x (0.75…2.5 mm²) with ferrule, or 2x (20…16) / 2x (18…14) AWG. The compact footprint leaves adjacent DIN-rail space for overload relays or terminal blocks.","metaTitle":"Siemens 3RH2911-1NF11 SIRIUS Auxiliary Switch, 1NO+1NC, Soli","metaDescription":"Siemens 3RH2911-1NF11 SIRIUS auxiliary switch block, 1 NO + 1 NC solid-state compatible contacts, screw terminals, for 3RT2 contactors. IP20, 690 V insulation, 0.3 A at 24/60 V. Ac","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Note":"with 3RT2.2/3/4","Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-1NF11","Height":"37.5 mm","at 24 V":"0.3 A","at 60 V":"0.3 A","description":"auxiliary switch, solid-state compatible, on the front, 1 NO + 1 NC,.3/.4, --/--, --/--,.1/.2, current path: 1 NO (solid-state compatible), --, --, 1 NC (solid-state compatible), screw terminal, for contactors 3RT2 and contactor relays 3RH2","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Lagging Switching":"0","Product Brand Name":"SIRIUS","Suitability For Use":"Contactor relay and power contactor","Instantaneous Contact":"1","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Contact Reliability Of Auxiliary Contacts":"one incorrect switching operation of 100 million switching operations (5 V, 1 mA)","Mechanical Service Life (Operating Cycles) Typical":"5 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$88.47","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/11821bf3efa0795087f601c94cf968b7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=183435&mlfb=3RH2911-1NF11"},"ai":{"faq":[{"question":"What does the note 'with 3RT2.2/3/4' mean?","answer":"It means the block mounts on SIRIUS contactors of sizes S2, S3, and S4 (3RT2 series), and on the corresponding 3RH2 contactor relays. It will not fit size S00 or S0 contactors without an adapter."},{"question":"Will this drop into a panel wired for a 3RT1015-1BB42?","answer":"No. The 3RT1015 is a size S00 contactor with a different front profile and mounting geometry. The 3RH2911-1NF11 is designed for larger 3RT2 frames (S2–S4). You would need the correct auxiliary block for size S00, such as the 3RH2911-1FA22."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1NF11","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/3RH2911-1NF11 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}