{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-2KF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-2KF40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-2KF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2KF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH1140-2KF40, 4 NO contacts, 110 V coil, S00 size, screw and snap-on mounting, IP20 front.","salesMarkdown":"The 3RH1140-2KF40: The coil is rated 110 V, with a closing and holding power of 2.3 W DC. That is a continuous-duty solenoid — it stays energized without overheating, so it can be left on for extended periods in a control panel. The built-in varistor suppresses the inductive kick when the coil de-energizes, which protects nearby electronics and extends contact life on the driving output. The four NO contacts are rated for switching at various voltages per IEC utilization categories. At 24 V the contacts carry 10 A; at 230 V they carry 6 A; at 400 V they carry 3 A; at 690 V they carry 1 A. These are the thermal current ratings (Ith) for the contact block — the actual making/breaking capacity depends on the load type. For a 110 V control circuit, the 1 A rating at 110 V is the figure to use for sizing the load side. That is a dry-circuit rating — it tells you the contacts are gold-flashed or otherwise treated to reliably switch low-energy signals without oxide buildup. For a PLC input or a 24 VDC sensor signal, this relay will not drop pulses. Mounting is by screw or snap-on onto a DIN rail. The S00 footprint means it clips directly alongside a 3RT1 contactor or onto a busbar adapter. That covers most panel layouts without derating. Wire terminals accept 2x 0.25 to 2.5 mm² solid or stranded. The substance prohibition date of 07/01/2006 aligns with the original EU RoHS directive. The part is RoHS-compliant as shipped.","metaTitle":"Siemens 3RH1140-2KF40 SIRIUS Coupling Relay, 110 V coil, 4 N","metaDescription":"Siemens SIRIUS 3RH1140-2KF40 coupling relay for switching auxiliary circuits. 110 V coil, 4 NO contacts, S00 size, IP20 front. Active production. Sourced to order.","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","title":"3RH1140-2KF40","Height":"60 mm","Rated Value":"110 V","description":"Contactor relay, 4 NO 110 V DC 0.7... 1.25* Us With varistor size S00 Spring-type terminal!!! Phased-out product!!! Successor is SIRIUS 3RH2 Preferred successor type is >>3RH2140-2LF40<<","Initial Value":"0.7","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":"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","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","Design Of The Surge Suppressor":"with varistor","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.3 W","holding power of magnet coil at DC":"2.3 W","Surge Voltage Resistance Rated Value":"6 kV","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (24 ... 14)","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":"$28.82","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/155cf203a7b267722809a5c2b607ff3d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=371176&mlfb=3RH1140-2KF40"},"ai":{"faq":[{"question":"What is the depth of the 3RH1140-2KF40?","answer":"The depth is 73 mm. This includes the coil terminals and the built-in varistor surge suppressor. The width is 45 mm and the height is 60 mm, matching the S00 contactor frame."},{"question":"What wire sizes does the 3RH1140-2KF40 accept?","answer":"The terminals accept 2x 0.25 to 2.5 mm² solid or stranded conductors. This covers standard control wiring from 22 AWG to 14 AWG."},{"question":"Will the 3RH1140-2KF40 drop into a panel designed for a 3RT1015-1BB42?","answer":"Yes, the 3RH1140-2KF40 shares the S00 contactor frame size (45 mm width, 60 mm height) with the 3RT1 S00 contactors. It mounts on the same DIN rail and uses the same screw or snap-on fastening method. The wiring terminals are also the same 0.25 to 2.5 mm² range. No panel rework is needed for the mechanical fit."},{"question":"What compliance documentation does the 3RH1140-2KF40 carry?","answer":"The substance prohibition date of 07/01/2006 confirms RoHS compliance. The part is rated IP20 on the front for finger protection. Surge voltage resistance is 6 kV, covering basic insulation requirements for 400 V networks. The pollution degree is 3, suitable for industrial environments with conductive pollution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-2KF40","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/3RH1140-2KF40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}