{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-2WB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-2WB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-2WB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2WB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 24 VDC coil, 4 NO instantaneous contacts, screw and snap-on mounting, IP20 front, with varistor surge suppression.","salesMarkdown":"It carries four normally-open instantaneous contacts rated for a range of voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. The 24 VDC coil draws 1.4 W both during pickup and hold, with a pickup threshold of 0.85 x rated voltage and a dropout threshold of 0.15 x rated voltage. A built-in varistor suppresses coil surge transients. The 45 mm wide, 60 mm tall, 73 mm deep footprint fits standard S00 panel layouts. ## Environmental and endurance ratings Rated for pollution degree 3 (conductive or dry non-conductive pollution). Shock resistance is 10g / 5 ms and 5g / 10 ms. Mechanical life is typical 30 million operations.","metaTitle":"Siemens 3RH1140-2WB40 SIRIUS Auxiliary Contactor, 24 VDC, 4","metaDescription":"Siemens 3RH1140-2WB40 SIRIUS auxiliary contactor, size S00, 24 VDC coil, 4 NO contacts. Rated 10 A at 24 V. IP20 front. Current production. Quoted 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","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":"1.85","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":"Auxiliary contactor","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":"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=387417&mlfb=3RH1140-2WB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2WB40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RH1140-2WB40?","answer":"The 3RH2122-1WB40 is a SIRIUS auxiliary contactor in the same S00 frame but carries 2 NO + 2 NC contacts instead of 4 NO. It shares the same 24 VDC coil voltage, screw/snap-on mounting, and IP20 front. Panel fit is the same 45 mm width, so it drops into the same DIN-rail slot without rewiring the coil supply, but the contact configuration differs — verify your circuit's NC requirements before substituting."},{"question":"What compliance documentation does Siemens provide for 3RH1140-2WB40?","answer":"The part carries a RoHS compliance date of 07/01/2006. The SIRIUS series typically supports IEC 60947-5-1 for contactor relays and UL/CSA listings; confirm specific certification markings on the nameplate for your jurisdiction."},{"question":"How do I get current pricing and availability for 3RH1140-2WB40?","answer":"Submit an RFQ through this listing. The part is sourced to order through independent distribution; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-2WB40","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/3RH1140-2WB40 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}}