{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-1KB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-1KB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-1KB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-1KB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH2140-1KB40, Size S00, 4 NO instantaneous contacts, 24 VDC coil with suppressor diode, 10 A rated current, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"The Siemens 3RH2140-1KB40 is a SIRIUS coupling relay designed for switching auxiliary circuits in control panels. The relay is built into the Size S00 contactor footprint, which means it shares the same compact 45 mm width and 57.5 mm height as the smallest SIRIUS contactors — a detail that matters when you're laying out a dense DIN-rail row. Wire termination accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded conductors. ## Electrical ratings and duty The 24 VDC coil draws 2.8 W closing power. Contact ratings span the full control-voltage range: 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 10 A at 230 V, 3 A at 400 V, 0.5 A at 440 V, 2 A at 500 V, 0.26 A at 600 V, and 1 A at 690 V (–). Mechanical life is rated at 30,000,000 cycles, with a maximum switching frequency of 10,000 operations per hour at AC and an arcing time of 10–15 ms.","metaTitle":"Siemens 3RH2140-1KB40 SIRIUS Coupling Relay, 4 NO, 24 VDC, 1","metaDescription":"Siemens 3RH2140-1KB40 SIRIUS coupling relay, 4 NO contacts, 24 VDC coil, 10 A rated current. Size S00, screw and snap-on DIN rail mount. Active production, sourced to order.","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","Height":"57.5 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"24 V","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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 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":"4","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 ... 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":"10 A","reference code according to IEC 81346-2":"K","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)","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","number of NO contacts for auxiliary contacts":"4","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":"40 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=374728&mlfb=3RH2140-1KB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2140-1KB40/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RH2140-1KB40?","answer":"The depth is 73 mm, which fits standard shallow enclosures when combined with the 10 mm forward clearance requirement."},{"question":"What is the width of 3RH2140-1KB40?","answer":"The width is 45 mm, matching the Size S00 contactor footprint for dense DIN-rail layouts."},{"question":"Will 3RH2140-1KB40 drop into a panel specified around 3RH2140-1BP40 without rewiring?","answer":"Both parts share the same Size S00 footprint, 45 mm width, and screw/snap-on DIN-rail mounting, so the mechanical fit is identical. The key difference is the coil voltage — the 1KB40 is 24 VDC, while the 1BP40 uses a different coil rating — so verify the control voltage before swapping."},{"question":"How do I get current pricing and availability for 3RH2140-1KB40?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels."},{"question":"What compliance documentation does Siemens provide for 3RH2140-1KB40?","answer":"The part is RoHS-compliant per the substance prohibition date of October 1, 2009. Standard Siemens SIRIUS documentation includes the declaration of conformity and environmental data sheets."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-1KB40","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/3RH2140-1KB40 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}}