{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-2JB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-2JB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-2JB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2JB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1140-2JB40 coupling relay, size S00, 24 VDC coil, 4 NO contacts, 10 A AC-12, screw/snap-on mounting, with diode surge suppression.","salesMarkdown":"The Siemens 3RH1140-2JB40 is a SIRIUS coupling relay designed to switch auxiliary circuits in control panels — think PLC output isolation, interposing between a controller and a motor contactor coil, or extending contact density in a safety circuit. The 24 VDC coil draws a constant 2.3 W whether picking or holding, so there's no inrush spike to stress a PLC output card. This relay carries four instantaneous normally-open contacts (no delayed, lagging, or make-before-break variants). For higher-voltage auxiliary circuits, the current drops off: 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. That derating curve tells you this part is at home in 24 VDC or 230 VAC control schemes, not for switching 690 V motor loads directly. The coil includes a built-in diode surge suppressor, so you don't need an external flyback diode across the coil terminals — one less part to install and one less thing to verify polarity on. ## Mechanical endurance Rated at 30,000,000 mechanical operating cycles — that's the life of the mechanism before wear, not the electrical life under load. For a relay that mostly sits energized in a control cabinet, that number is effectively infinite for the panel's service life. Shock resistance is 10g for 5 ms and 5g for 10 ms, which covers most industrial vibration from contactors and drives in the same enclosure.","metaTitle":"Siemens 3RH1140-2JB40 SIRIUS Coupling Relay, 24 VDC, 10 A","metaDescription":"Siemens SIRIUS 3RH1140-2JB40 coupling relay for switching auxiliary circuits. 24 VDC coil, 10 A AC-12 rating, 4 NO contacts, diode suppression. DIN rail mount, size S00. Sourced to","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","Maximum":"2 000 m","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","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":"4","For Auxiliary Contacts":"0","Make-Before-Break Switching":"0","Design of the surge suppressor":"with diode","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)","at AWG conductors for auxiliary contacts":"2x (24 ... 14)","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","Identification number and letter for switching elements":"40 E","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=431711&mlfb=3RH1140-2JB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2JB40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RH1140-2JB40 and how is it quoted?","answer":"We source it to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — send an RFQ and we'll respond with a firm price and lead time."},{"question":"What is the 3RH1140-2JB40's depth?","answer":"The depth is 73 mm, with a width of 45 mm and height of 60 mm."},{"question":"What wire size does the 3RH1140-2JB40 accept?","answer":"The screw terminals accept 2x (0.25 to 2.5 mm²) solid or stranded wire — standard for control wiring up to 14 AWG."},{"question":"Will the 3RH1140-2JB40 drop into a panel built for a 3RT1015-1BB42?","answer":"Both are size S00 devices with the same 45 mm width and DIN-rail mounting, so the footprint and panel cutout are identical. The main difference is the 3RH1140-2JB40 is a coupling relay (auxiliary contacts only, no main power poles) while the 3RT1015-1BB42 is a contactor with power poles. If the panel only needs auxiliary switching, it's a direct mechanical swap."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-2JB40","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/3RH1140-2JB40 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}}