{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1911-1FA31","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1911-1FA31","canonicalUrl":"https://aoctrl.com/siemens/3RH1911-1FA31","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1911-1FA31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary switch, 3 NO instantaneous contacts, snap-on front mount for S00 contactor relays and power contactors, IP20.","salesMarkdown":"The Siemens 3RH1911-1FA31 is a SIRIUS auxiliary switch with 3 normally open instantaneous contacts, designed to snap onto the front of S00-size contactor relays and power contactors. It's the add-on block you grab when a 3RT1 contactor needs more N.O. feedback or pilot-duty signaling without eating up extra DIN rail. Rated for AC-15 and DC-13 switching duty, the contact block handles 6 A at 24 V and 10 A at 24 V rated value, stepping down to 0.3 A at 220/250 V AC and 0.26 A at 600 V — so it's fine for PLC inputs, relay coils, and indicator lamps across a wide control-voltage spread. The AC-15 rating at 690 V holds at 1 A, enough for most 480 V to 690 V pilot circuits you'll find on European-sourced machines. Snaps onto the front of a 3RT1 S00 contactor or contactor relay — no tools, no DIN-rail space lost. The block measures 36.5 mm wide, 37.5 mm high, and 41.5 mm deep, fitting flush against the contactor body. Terminals accept 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²) with ferrules; AWG equivalents are 2x (20 to 16) and 2x (18 to 14). The mechanical life is rated for 10 million operating cycles typical, and contact reliability is specified at 1 faulty switching per 100 million operations at 17 V, 1 mA — a solid spec for low-energy logic circuits where oxide buildup can cause intermittent faults. The mirror contact feature per IEC 60947-4-1 is present when used with the 3RT1 contactor — that means the N.O. mirror contact mechanically reflects the main contact position, a requirement in safety circuits where you need positive indication that the power contacts have opened. Substance prohibitance date references RoHS compliance effective July 1, 2006 — the part is RoHS-compliant.","metaTitle":"Siemens 3RH1911-1FA31 SIRIUS Auxiliary Switch, 3 NO Contacts","metaDescription":"Siemens 3RH1911-1FA31 SIRIUS auxiliary switch for S00 contactors. 3 NO contacts, snap-on front mount, IP20. AC-15/DC-13 rated. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"41.5 mm","Width":"36.5 mm","title":"3RH1911-1FA31","Height":"37.5 mm","at 24 V":"6 A","at 48 V":"2 A","at 60 V":"2 A","at 110 V":"1 A","at 125 V":"0.9 A","at 220 V":"0.3 A","at 230 V":"6 A","at 250 V":"0.3 A","at 400 V":"3 A","description":"Auxiliary switch block, 31 3 NO + 1 NC EN 50005 Screw terminal size S00 For auxiliary and motor contactors!!! Phased-out product!!! Successor is SIRIUS 3RH2 Preferred successor type is >>3RH2911-1HA31<<","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"snap-on mounting","Product Category":"Auxiliary switch","Size Of Contactor":"S00","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","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 440 V rated value":"0.5 A","at 600 V rated value":"0.26 A","Design Of The Product":"for snapping onto the front","Instantaneous Contact":"3","Substance Prohibitance (Date)":"07/01/2006","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)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes; with 3RT1","operational current at AC-15 at 690 V rated value":"1 A","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","operational current of auxiliary contacts at AC-12 maximum":"10 A","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":"$24.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/8a2cd2fc5e7582e3609fc17301cb54f8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=292988&mlfb=3RH1911-1FA31"},"ai":{"faq":[{"question":"What are the key ratings for the 3RH1911-1FA31?","answer":"It carries 3 NO instantaneous contacts rated for AC-15 and DC-13 duty. At 24 V it switches 6 A (AC) or 10 A (rated value); at 230 V it's 6 A; at 400 V it's 3 A; and at 690 V AC-15 it's 1 A. DC ratings step from 2 A at 48/60 V down to 0.26 A at 600 V."},{"question":"Where can I buy the 3RH1911-1FA31?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What compliance documentation does Siemens provide for this auxiliary switch?","answer":"The part is RoHS-compliant per the substance prohibitance date of July 1, 2006. It carries a mirror contact certification to IEC 60947-4-1 when paired with the 3RT1 contactor. Surge voltage resistance is rated at 6 kV."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1911-1FA31","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/3RH1911-1FA31 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}}