{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2911-1NF02","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2911-1NF02","canonicalUrl":"https://aoctrl.com/siemens/3RH2911-1NF02","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2911-1NF02","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3RH2911-1NF02, 2 NC solid-state compatible, snap-on front mount, screw terminals, 0.3 A at 24-60 V.","salesMarkdown":"The Siemens SIRIUS 3RH2911-1NF02 is a front-mounted auxiliary switch designed for contactor relays and power contactors in the S00, S0, S2, and S3 frame sizes. It provides two normally-closed (NC) contacts that are solid-state compatible, meaning they switch reliably at the low voltage and current levels typical of PLC inputs and electronic control circuits — rated at 0.3 A across 24 V, 48 V, and 60 V. The contact reliability spec backs this up: one incorrect switching operation per 100 million cycles at 5 V, 1 mA. That is the rating that matters for a line-side PLC input that sees a dry contact closure. Snaps onto the front of the contactor — no DIN rail required, no screws. The 36 mm width matches the contactor body, so it does not add panel width. Screw terminals accept 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²) with ferruled ends; AWG 20 to 14. Strip length is standard for screw clamps. ## Electrical ratings and compliance Rated insulation voltage 690 V at pollution degree 3, surge voltage resistance 6 kV — standard for industrial control panels up to 480/600 V line-to-line. The mirror contact feature per IEC 60947-4-1 is present when used with 3RT2.2/3/4 contactors, which means the NC position is mechanically linked to the main contacts for safety-related feedback. RoHS compliance date 2009-10-01.","metaTitle":"Siemens 3RH2911-1NF02 SIRIUS Auxiliary Switch, 2 NC, 0.3 A","metaDescription":"Siemens SIRIUS 3RH2911-1NF02 auxiliary switch, 2 NC solid-state compatible contacts, 0.3 A at 24-60 V, snap-on front mount for contactors S00-S3. Active lifecycle, screw terminals,","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"43.7 mm","Width":"36 mm","title":"3RH2911-1NF02","Height":"37.5 mm","at 24 V":"0.3 A","at 48 V":"0.3 A","at 60 V":"0.3 A","description":"auxiliary switch, solid-state compatible, on the front, 2 NC,.1/.2, --/--, --/--,.1/.2, current path: 1 NC (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","Product Category":"Auxiliary switch","Lagging Switching":"0","Size Of Contactor":"S00, S0, S2, S3","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch","Suitability For Use":"Contactor relay and power contactor","Design Of The Product":"for snapping onto the front","Instantaneous Contact":"0","Substance Prohibitance (Date)":"10/01/2009","protection class IP on the front":"IP20","Surge Voltage Resistance Rated Value":"6 kV","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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":"Yes; with 3RT2.2/3/4","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","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":"$89.11","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/8b2636bd1663501d152164fa811ae90d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=262073&mlfb=3RH2911-1NF02"},"ai":{"faq":[{"question":"What are the key dimensions of the 3RH2911-1NF02?","answer":"Depth 43.7 mm, width 36 mm, height 37.5 mm. It snaps onto the front of the contactor, so the overall depth of the contactor-plus-block assembly is the contactor depth plus 43.7 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2911-1NF02","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/3RH2911-1NF02 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}}