{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-2BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-2BF40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-2BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 4 NO + 0 NC, 110 V DC coil, screw and snap-on mounting, IP20 front.","salesMarkdown":"It carries four normally-open (4 NO) instantaneous contacts with zero delayed, lagging, or make-before-break switching, so every contact closes at the same instant the coil pulls in. The magnet coil is rated 110 V DC, drawing 3.2 W on both pickup and hold — no power drop after sealing, so the coil dissipation is constant and the supply must be sized for the full 3.2 W continuously. The main contact rating is 10 A at AC-12 (resistive loads up to 400 V), which is the standard auxiliary contactor duty for control transformers, indicator lamps, and PLC digital inputs. At 110 V the contacts are rated 1 A, at 230 V it drops to 6 A, and at 690 V to 1 A — the AC-12 curve is linear with voltage, so for a given load voltage interpolate between these points. The product extension auxiliary switch is available (field-addable), so the 4 NO base can be expanded with additional contact blocks if the control scheme needs more than four signals. RoHS compliance date is marked as 07/01/2006. No UL or CSA listing is explicitly stated in the evidence.","metaTitle":"Siemens 3RH1140-2BF40 SIRIUS Auxiliary Contactor, 110 V DC C","metaDescription":"Siemens 3RH1140-2BF40 SIRIUS auxiliary contactor, 110 V DC coil, 4 NO contacts, AC-12 rated 10 A. Size S00, screw/snap-on mount, IP20 front. Sourced to 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":"110 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=361747&mlfb=3RH1140-2BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2BF40/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RH1140-2BF40's coil voltage and power draw?","answer":"The coil is rated 110 V DC and draws 3.2 W on both pickup and hold — constant dissipation, no power drop after sealing."},{"question":"Will 3RH1140-2BF40 drop into a panel specified around 3RH2140-1BP40 without rewiring?","answer":"Both are Size S00 auxiliary contactors with the same mounting footprint and terminal spacing, so the mechanical fit is identical. The difference is the contact arrangement: 3RH1140-2BF40 has 4 NO, while the peer has a different NO/NC split — verify your control schematic before swapping."},{"question":"Where can I buy 3RH1140-2BF40 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-2BF40","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/3RH1140-2BF40 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}}