{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-2MB40-0KT0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-2MB40-0KT0","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-2MB40-0KT0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2MB40-0KT0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay for switching auxiliary circuits, 3RH1140-2MB40-0KT0, 24 V DC coil, 4 NO instantaneous contacts, 10 A at 24 V, screw and snap-on mounting, IP20 front, size S00.","salesMarkdown":"The Siemens 3RH1140-2MB40-0KT0 is a SIRIUS coupling relay for switching auxiliary circuits, sized S00. It carries 4 NO instantaneous contacts rated 10 A at 24 V, with a 24 V DC coil drawing 1.4 W closing and holding. Screw and snap-on mounting onto DIN rail; IP20 front protection keeps live terminals behind the panel door. ## Contact ratings and switching Four instantaneous contacts — no delayed, lagging, or make-before-break transitions. The 10 A at 24 V rating is the highest thermal current; derate as voltage climbs: 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V. Contact reliability is specified as one incorrect switching operation per 100 million at 17 V, 1 mA — that's the dry-circuit threshold for PLC-level signals. Mechanical endurance typical is 30 million cycles. ## Coil and environmental Pickup at 85% of rated voltage (20.4 V for a 24 V coil); drop-out at 2.15 times rated (51.6 V). Shock rated 10g for 5 ms and 5g for 10 ms. Pollution degree 3 (conductive or dry non-conductive pollution). Surge voltage resistance 6 kV. ## Wiring and integration Solid and stranded conductors 2x 0.25 to 2.5 mm² (AWG 24 to 14). Dimensions: 45 mm wide, 60 mm tall, 73 mm deep — fits the S00 contactor footprint. No auxiliary switch extension available on this variant.","metaTitle":"Siemens 3RH1140-2MB40-0KT0 SIRIUS Coupling Relay, 24 V, 4 NO","metaDescription":"Siemens 3RH1140-2MB40-0KT0 SIRIUS coupling relay, 24 V DC coil, 4 NO contacts, 10 A at 24 V, screw/snap-on mounting, IP20 front. Active production. Order against RFQ.","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","Rated Value":"24 V","Initial Value":"0.85","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °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 (24 ... 14)","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","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)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","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":"Cage Clamp 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=421518&mlfb=3RH1140-2MB40-0KT0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2MB40-0KT0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1140-2MB40-0KT0?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time."},{"question":"What is the depth of 3RH1140-2MB40-0KT0?","answer":"73 mm depth, 45 mm width, 60 mm height — fits the standard S00 contactor footprint on 35 mm DIN rail."},{"question":"What wire sizes does 3RH1140-2MB40-0KT0 accept?","answer":"Solid and stranded conductors 2x 0.25 to 2.5 mm², equivalent to AWG 24 to 14. Screw terminals."},{"question":"What is the contact rating at different voltages?","answer":"10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V. All four NO contacts share the same rating."},{"question":"What compliance documentation does this part carry?","answer":"RoHS compliance dated 07/01/2006. Pollution degree 3. IP20 front protection. Surge voltage resistance 6 kV."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-2MB40-0KT0","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/3RH1140-2MB40-0KT0 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}}