{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1131-2KF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1131-2KF40","canonicalUrl":"https://aoctrl.com/siemens/3RH1131-2KF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1131-2KF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1131-2KF40 coupling relay, size S00, 110 V DC coil, 3 NO contacts, screw and snap-on mounting, IP20 front.","salesMarkdown":"The Siemens 3RH1131-2KF40 is a SIRIUS coupling relay designed for switching auxiliary circuits in control panels. It carries three instantaneous normally-open (NO) contacts and a 110 V DC coil. The size S00 footprint (45 mm wide, 60 mm tall, 73 mm deep) fits standard DIN-rail enclosures alongside contactors of the same frame class. A built-in varistor suppresses the switching surge across the coil, which extends the life of downstream PLC outputs driving it. Rated for pollution degree 3, this relay handles the conductive-dust and humidity conditions typical of industrial control cabinets without conformal coating. The contact ratings are given per voltage, not as a single blanket ampacity. At 24 V it switches 10 A; at 110 V it switches 1 A; at 230 V it switches 6 A; at 400 V it switches 3 A; at 500 V it switches 2 A; at 690 V it switches 1 A. These are thermal current ratings (Ith) for AC loads — the actual make/break capability for inductive DC loads will be lower. For a 110 V DC control circuit, the 1 A rating is the hard limit; don't assume the 10 A at 24 V carries over. Contact reliability is specified as one incorrect switching operation per 100 million cycles at 17 V, 1 mA. That's the low-energy switching floor — if your circuit runs dry contacts at logic levels, this relay will hold up. The mechanical life of the contactor typical is 30 million operations, so the electrical endurance at rated load will be the limiting factor in high-cycle applications. Wire termination accepts 2x (0.25 to 2.5 mm²) solid or stranded conductors — no ferrule required for solid wire, but stranded should use ferrules for reliable cage-clamp grip. Shock resistance is rated at 10g for 5 ms and 5g for 10 ms, which covers most industrial vibration environments short of direct hammer-mill mounting.","metaTitle":"Siemens 3RH1131-2KF40 SIRIUS Coupling Relay, 110 V coil, 3 N","metaDescription":"Siemens SIRIUS 3RH1131-2KF40 coupling relay for auxiliary circuits. 110 V DC coil, 3 instantaneous NO contacts, size S00. IP20 front. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"60 mm","Rated Value":"110 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"1.25","Shock Resistance":"10g / 5 ms and 5g / 10 ms","Delayed Switching":"0","Lagging Switching":"0","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S00","Product Brand Name":"SIRIUS","Contact Reliability":"one incorrect switching operation of 100 million switching operations (17 V, 1 mA)","Degree Of Pollution":"3","Product Designation":"Coupling relay for switching auxiliary circuits","at 24 V rated value":"10 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.27 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"2 A","at 690 V rated value":"1 A","Instantaneous Contact":"3","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Substance Prohibitance (Date)":"07/01/2006","Design Of The Surge Suppressor":"with varistor","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.3 W","holding power of magnet coil at DC":"2.3 W","Surge Voltage Resistance Rated Value":"6 kV","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (24 ... 14)","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Of Auxiliary Contacts Instantaneous Contact":"0","with high demand rate according to SN 31920":"75 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"3","Type Of Voltage Of The Control Supply Voltage":"DC","Identification Number And Letter For Switching Elements":"31 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","Type Of Electrical Connection For Auxiliary And Control Circuit":"Cage Clamp terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2873c911d7139bae349729e209f4efb7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=93827&mlfb=3RH1131-2KF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1131-2KF40/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the 3RH1131-2KF40 accept?","answer":"It accepts 2x (0.25 to 2.5 mm²) solid or stranded conductors per terminal."},{"question":"What is the physical size of this coupling relay?","answer":"It is 45 mm wide, 60 mm tall, and 73 mm deep — size S00 footprint."},{"question":"Does the 3RH1131-2KF40 have built-in surge suppression?","answer":"Yes, it includes a varistor across the coil for surge suppression."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1131-2KF40","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/3RH1131-2KF40 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}}