{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-2KF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-2KF40","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-2KF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-2KF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH2131-2KF40, 110 V DC coil with integrated suppressor diode, 3 normally open contacts, size S00, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"That matters when you're squeezing a retrofit into a crowded backplate. Overall dimensions: 73 mm deep, 45 mm wide, 70 mm high. The 3RH2131-2KF40 carries three normally open instantaneous contacts. The switching capacity depends on the voltage you're switching: at 110 V rated value it handles 3 A, at 230 V it's 10 A, at 400 V it drops to 3 A. That 10 A at 230 V is the sweet spot for most control-circuit loads — solenoids, contactor coils, indicator lights. At 24 V it's 10 A; at 60 V it's 4.7 A. The arcing time sits at 10–15 ms, and the mechanical life is 30,000,000 operations typical — that's decades in normal cycling service. The coil closing power at DC is 2.8 W, so it's light on the control transformer.","metaTitle":"Siemens SIRIUS 3RH2131-2KF40 Coupling Relay, 110 V Coil, 3 N","metaDescription":"Siemens SIRIUS 3RH2131-2KF40 coupling relay for auxiliary circuits. 110 V DC coil with suppressor diode, 3 NO contacts, S00 size, screw and snap-on DIN rail mount. Current lifecycl","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 20 ms","title":"3RH2131-2KF40","Height":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"110 V","description":"Coupling contactor relay, 3 NO + 1 NC, 110 V DC, 0.7... 1.25* US, with integrated suppressor diode, Size S00, Spring-type terminal suitable for PLC outputs","Initial Value":"0.7","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Full-Scale Value":"1.25","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","Solid Or Stranded":"2x (0,5 ... 4 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Coupling relay for switching auxiliary circuits","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"10 A","at 400 V rated value":"3 A","at 440 V rated value":"0.5 A","at 500 V rated value":"2 A","at 600 V rated value":"0.26 A","at 690 V rated value":"1 A","Instantaneous Contact":"3","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"suppressor diode","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.8 W","holding power of magnet coil at DC":"2.8 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 12)","operating frequency at DC-12 maximum":"1 000 1/h","operating frequency at DC-13 maximum":"1 000 1/h","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.5 ... 2.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","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","contact rating of auxiliary contacts according to UL":"A600 / Q600","Identification Number And Letter For Switching Elements":"31 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","design of the miniature circuit breaker for short-circuit protection of the auxiliary circuit up to 230 V":"C characteristic: 6 A; 0.4 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/28faa0c7598e28af4bcbb7487dedec9d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=183416&mlfb=3RH2131-2KF40"},"ai":{"faq":[{"question":"Where can I buy 3RH2131-2KF40 and how do I get a price?","answer":"Sourced and quoted to order through our independent distribution channel. Submit an RFQ for current pricing and availability — confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 3RH2131-2KF40?","answer":"The part carries a substance prohibition date of 10/01/2009, indicating RoHS compliance. Standard Siemens documentation includes the declaration of conformity and the datasheet."},{"question":"Will 3RH2131-2KF40 drop into a panel specified around 3RH2131-2AK60 without rewiring?","answer":"Both are SIRIUS size S00 coupling relays with the same 45 mm width and DIN rail mount, so the mechanical fit is the same. The difference is the coil voltage: the 2KF40 is 110 V DC with a built-in suppressor diode; the 2AK60 is a different coil variant. Check your coil voltage before swapping — if it matches 110 V DC, the relay drops in without rewiring."},{"question":"What is 3RH2131-2KF40's listed depth?","answer":"73 mm."},{"question":"What is 3RH2131-2KF40's listed width?","answer":"45 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-2KF40","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/3RH2131-2KF40 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}}