{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1HB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1HB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1HB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1HB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay 3RH1140-1HB40, S00 size, 24 V DC coil, 10 A AC-12 rated, 45 mm width, screw and snap-on mounting.","salesMarkdown":"The Siemens 3RH1140-1HB40 is a SIRIUS coupling relay designed for switching auxiliary circuits — think interposing between a PLC output and a larger contactor coil, or isolating control signals across voltage domains. It's built into the S00 contactor footprint, so it shares the same 45 mm width and snap-on DIN rail mounting as the SIRIUS contactor line. The coil pulls 2.3 W DC both on pick-up and hold, and the rated operating current hits 10 A at AC-12 duty (resistive loads at 24 V). Terminal wiring accepts solid conductors: two per clamp in 0.5–1.5 mm², 0.75–2.5 mm², or a single 4 mm². That's enough for most control-circuit runs without needing bootlace ferrules, though ferruled stranded is fine. Side clearance is zero — you can butt it against the next device. The IP20 front rating is standard for enclosed panels; keep it behind a gland plate or cabinet door. The relay has 4 normally-open instantaneous contacts and no auxiliary switch block. Pick-up voltage is 0.7 x rated (about 16.8 V DC); drop-out is 1.25 x rated (30 V DC) — meaning it releases reliably when the coil voltage rises above that threshold, not below. Mechanical endurance is 30 million operations, which outlasts most panel designs. Shock resistance is 10g at 5 ms and 5g at 10 ms, so it holds up in machine-mounted enclosures near presses or conveyors.","metaTitle":"Siemens 3RH1140-1HB40 SIRIUS Coupling Relay, 24 VDC, 10 A AC","metaDescription":"Siemens 3RH1140-1HB40 SIRIUS coupling relay for switching auxiliary circuits. 24 VDC coil, 10 A AC-12 rated. S00 contactor size. 45 mm wide. Current lifecycle stage. Sourced to ord","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"72 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"45 mm","Height":"57.5 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","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 61346-2":"K","Reference code acc. to DIN EN 81346-2":"K","with low demand rate acc. to SN 31920":"40 %","With Degree Of Pollution 3 Rated Value":"690 V","with high demand rate acc. to SN 31920":"75 %","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","Of Auxiliary Contacts Instantaneous Contact":"0","Number of NC contacts for auxiliary contacts":"0","Number of NO contacts for auxiliary contacts":"4","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=249891&mlfb=3RH1140-1HB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1HB40/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RH1140-1HB40?","answer":"Submit an RFQ against this order code. Availability and current pricing are confirmed at quote time through independent distribution channels — no stock count or price figure is published here."},{"question":"What is 3RH1140-1HB40's listed depth on this component line?","answer":"The depth is 72 mm, which fits standard S00 contactor depth in SIRIUS enclosures and DIN-rail layouts."},{"question":"Will 3RH1140-1HB40 drop into a panel specified around 3RT1015-1BB42 without rewiring?","answer":"Both share the S00 contactor footprint (45 mm width, same DIN-rail mounting), so the mechanical fit is identical. The 3RH1140-1HB40 is a coupling relay with 4 NO contacts and no main power poles, whereas the 3RT1015-1BB42 is a power contactor — they serve different circuit functions. The wiring scheme (coil voltage, terminal layout) is compatible, but the load-side wiring differs because one switches auxiliary circuits and the other switches motor loads."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-1HB40","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/3RH1140-1HB40 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}}