{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1MB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1MB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1MB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1MB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH1140-1MB40 coupling relay, 24 V DC coil, 4 normally-open instantaneous contacts, 10 A at 24 V, S00 size, IP20 front, screw and snap-on mounting.","salesMarkdown":"The Siemens SIRIUS 3RH1140-1MB40 is a coupling relay — a compact auxiliary contactor designed to switch control and signal circuits in a panel. Its 24 V DC coil pulls in at 85 % of rated voltage and drops out at 215 % of rated voltage, giving a clean pick-up and dropout margin for PLC or safety-relay outputs. It carries four normally-open instantaneous contacts (no delayed or leading/lagging switching), rated at 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — enough for pilot lamps, contactor coils, solenoid valves, and small motor contactor auxiliaries. The S00 frame size (45 mm wide, 57.5 mm tall, 72 mm deep) fits the standard DIN-rail footprint and can be screw-mounted or snapped onto the rail. Terminals accept 2x (0.5…1.5 mm²), 2x (0.75…2.5 mm²), or 2x 4 mm² solid/stranded, with AWG equivalents at 2x (20…16), 2x (18…14), and 1x 12. The IP20 front protection keeps fingers out during live maintenance. No allocation pressure expected on this 24 V DC variant. The part is RoHS-compliant per the substance prohibition date of July 1, 2006.","metaTitle":"Siemens 3RH1140-1MB40 SIRIUS Coupling Relay, 24 V DC, 4 NO","metaDescription":"Siemens SIRIUS 3RH1140-1MB40 coupling relay, 24 V DC coil, 4 NO contacts, 10 A at 24 V. Active production, IP20, screw/snap-on mounting. Sourced to order.","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","Rated Value":"24 V","Initial Value":"0.85","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +40 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"2.15","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","Contact Reliability":"one incorrect switching operation of 100 million switching operations (17 V, 1 mA)","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","Substance Prohibitance (Date)":"07/01/2006","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"1.4 W","holding power of magnet coil at DC":"1.4 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","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)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"40 %","Of Auxiliary Contacts Instantaneous Contact":"0","with high demand rate according to SN 31920":"75 %","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","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","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"}},"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=126836&mlfb=3RH1140-1MB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1MB40/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-1MB40","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/3RH1140-1MB40 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}}