{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH6131-1KF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH6131-1KF40","canonicalUrl":"https://aoctrl.com/siemens/3RH6131-1KF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH6131-1KF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH6131-1KF40, 110 VDC coil, 1 NC + 3 NO contacts, size S00, screw terminals, snap-on 35 mm DIN rail.","salesMarkdown":"The Siemens 3RH6131-1KF40 is a SIRIUS coupling relay — size S00, designed to switch auxiliary circuits from a 110 VDC control signal. It gives you 1 NC and 3 NO contacts (31 E switching element identification), rated for 6 A at 24 VDC and 10 A at 230 VAC. The built-in suppressor diode handles the DC coil flyback; no external snubber needed. Snaps onto 35 mm standard DIN rail or screws directly to a panel backplate. At 45 mm wide and 57.5 mm tall, it occupies a single S00 footprint — no extra width for the auxiliary block. The screw terminals accept 2x 0.5 to 2.5 mm² solid/stranded or 2x 4 mm²; AWG equivalents are 2x 20–16, 2x 18–14, or 2x 12. ## Contact ratings and switching duty AC-12 operational current is 6 A; AC-15 at 230 V is 10 A, at 400 V it's 3 A, and at 690 V it's 1 A. DC-12 and DC-13 max operating frequency is 1 000 1/h. Mechanical life is 30 million switching cycles.","metaTitle":"Siemens 3RH6131-1KF40 SIRIUS Coupling Relay, 110 VDC, 1NC+3N","metaDescription":"Siemens 3RH6131-1KF40 SIRIUS coupling relay, 110 VDC coil, 1NC+3NO contacts, size S00. Active production, DIN rail mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"10 000 1/h","Height":"57.5 mm","Rated Value":"110 V","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail","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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Product Designation":"Coupling relay for switching auxiliary circuits","at 24 V rated value":"6 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 690 V rated value":"1 A","Substance Prohibitance (Date)":"05/01/2012","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 ... 16), 2x (18 ... 14), 2x 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":"6 A","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)","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","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","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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=641386&mlfb=3RH6131-1KF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH6131-1KF40/alternatives.json"},"ai":{"faq":[{"question":"What is the contact configuration on 3RH6131-1KF40?","answer":"It has 1 NC contact and 3 NO contacts, identified as switching element 31 E. That's the standard arrangement for a coupling relay that needs to signal back to a controller while switching multiple loads."},{"question":"Will 3RH6131-1KF40 drop into a panel designed for 3RH6131-1BF40?","answer":"Yes — both are size S00, same 45 mm width, same 35 mm DIN rail snap-on mounting, same screw terminal layout. The difference is the coil voltage: 1KF40 is 110 VDC, 1BF40 is 24 VDC. If your panel has a 110 VDC control bus, it's a direct swap without rewiring."},{"question":"Where can I buy the 3RH6131-1KF40?","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."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH6131-1KF40","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/3RH6131-1KF40 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}}