{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-2BG40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-2BG40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-2BG40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2BG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 4 NO instantaneous contacts, AC-12 10 A, 125 V DC coil, IP20, screw and snap-on mounting.","salesMarkdown":"## Integrator note — 3RH1140-2BG40 Siemens SIRIUS auxiliary contactor 3RH1140-2BG40 is a size S00 relay block with four normally-open instantaneous contacts, no delayed or make-before-break switching. Rated AC-12 at 10 A, it handles resistive loads in control circuits — think PLC output isolation or contactor coil switching. Coil draws 3.2 W DC holding power, so no thermal nuisance on a crowded DIN rail; the 125 V DC coil sits within standard 110–125 V control buses. AC-12 10 A is the resistive load rating — switching solenoids or contactor coils at up to 10 A. At 230 V the contactor is rated 6 A, at 400 V it drops to 3 A, at 690 V to 1 A. That derating follows the arc-extinction limit: higher voltage, lower current. The 24 V DC rating is 10 A, same as AC-12, so it works in 24 V control panels without derating. Screw and snap-on mounting for 35 mm DIN rail. Width 45 mm, height 60 mm, depth 73 mm — fits standard S00 footprint. Lifecycle stage is current — no phase-out notice. This is a standard catalog part in the SIRIUS family. Compliance with RoHS substance prohibitance date 07/01/2006.","metaTitle":"Siemens SIRIUS 3RH1140-2BG40 Auxiliary Contactor, AC-12 10 A","metaDescription":"Siemens SIRIUS auxiliary contactor 3RH1140-2BG40, size S00, 4 NO contacts, AC-12 10 A rated, 125 V coil, 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":"73 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"60 mm","Rated Value":"125 V","Initial Value":"0.8","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":"1.1","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","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"3.2 W","holding power of magnet coil at DC":"3.2 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","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","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","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","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=403580&mlfb=3RH1140-2BG40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2BG40/alternatives.json"},"ai":{"faq":[{"question":"What is 3RH1140-2BG40's depth?","answer":"The depth is 73 mm, part of the S00 size footprint."},{"question":"What wire size does 3RH1140-2BG40 accept?","answer":"Solid wire: 2x (0.25 to 2.5 mm²). Stranded with ferrule also fits that range."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-2BG40","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/3RH1140-2BG40 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}}