{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-2KB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-2KB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-2KB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2KB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH1140-2KB40, 4 NO contacts, 24 VDC coil, 10 A at 24 V, screw and snap-on mounting, size S00, IP20.","salesMarkdown":"The Siemens SIRIUS 3RH1140-2KB40 is a coupling relay for switching auxiliary circuits, carrying 4 instantaneous NO contacts rated at 10 A at 24 V (AC-12 maximum). No auxiliary switch or delayed/make-before-break switching is built in; this is a straight four-pole normally-open relay for signal-level or low-power load isolation. ## Environmental and isolation Shock resistance is specified at 10g / 5 ms and 5g / 10 ms — adequate for panel-mounted equipment in industrial machinery subject to intermittent vibration. ## Wiring and suppression Terminals accept solid conductors from 0.25 to 2.5 mm² (2x per clamp) and finely stranded with ferrule from 0.25 to 1.5 mm². A built-in varistor provides surge suppression across the coil — no external snubber needed for standard 24 VDC switching, though verify polarity if the circuit includes free-wheeling diodes elsewhere.","metaTitle":"Siemens SIRIUS 3RH1140-2KB40 Coupling Relay, 24 VDC, 4 NO, 1","metaDescription":"Siemens SIRIUS 3RH1140-2KB40 coupling relay, 24 VDC coil, 4 NO contacts rated 10 A at 24 V. Screw/snap-on mount, IP20, size S00. Active production. Quoted on request.","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","At The Side":"0 mm","Rated Value":"24 V","On The Front":"IP20","Initial Value":"0.7","Mounting Type":"screw and snap-on mounting","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","Auxiliary Switch":"No","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","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","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","Instantaneous Contact":"4","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Design Of The Surge Suppressor":"with varistor","closing power of magnet coil at DC":"2.3 W","holding power of magnet coil at DC":"2.3 W","operating current at AC-12 maximum":"10 A","Surge Voltage Resistance Rated Value":"6 kV","reference code acc. to DIN EN 81346-2":"K","with low demand rate acc. to SN 31920":"40 %","with high demand rate acc. to SN 31920":"75 %","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)","For Auxiliary And Control Current Circuit":"Cage Clamp terminals","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Of Auxiliary Contacts Instantaneous Contact":"0","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"4","with degree of pollution 3 at AC rated value":"690 V","Type Of Voltage Of The Control Supply Voltage":"DC","operating current at AC-15 at 230 V rated value":"6 A","operating current at AC-15 at 400 V rated value":"3 A","operating current at AC-15 at 500 V rated value":"2 A","operating current at AC-15 at 690 V rated value":"1 A","Identification Number And Letter For Switching Elements":"40 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","type of connectable conductor cross-sections at AWG conductors for auxiliary contacts":"2x (24 ... 14)"}},"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=228756&mlfb=3RH1140-2KB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2KB40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RH1140-2KB40?","answer":"Within the SIRIUS contactor family, the 3RT1016-1BB42 is a contactor rather than a coupling relay, so it carries a different duty rating and coil configuration. The 3RH1140-2KB40 is a dedicated auxiliary-circuit coupling relay with 4 NO contacts; a contactor sibling like 3RT1016-1BB42 serves main power switching and would not be a direct drop-in without rewiring. If you need a functional second-source within the same size S00 footprint, verify the contact count and coil voltage match your circuit before substituting."},{"question":"How do I get current pricing and availability for 3RH1140-2KB40?","answer":"Submit an RFQ through this listing. The part is sourced to order through independent distribution; availability and current pricing are confirmed at quote time, not published here."},{"question":"What is 3RH1140-2KB40's listed depth?","answer":"73 mm. Combined with a width of 45 mm and height of 60 mm, the size S00 envelope fits standard DIN-rail panels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-2KB40","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/3RH1140-2KB40 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}}