{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1BD40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1BD40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1BD40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BD40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3RH1140-1BD40, 42 V DC coil, 4 NO contacts, 45 mm width, IP20 front, screw and snap-on mounting.","salesMarkdown":"Its 42 V DC coil pulls in at 0.8x rated voltage and holds at 3.2 W, so the control transformer or PLC output driving it needs to source that inrush and seal current. The four normally-open instantaneous contacts are rated for switching at various voltages: 10 A at 24 V, 1 A at 110 V, 0.27 A at 220 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V — meaning the same contact set handles both 24 VDC pilot-duty and 400 VAC motor-circuit interlocking, but the ampacity drops fast as voltage climbs. At 45 mm wide, 57.5 mm tall, and 72 mm deep, it fits a standard 45 mm slot in a control panel layout. Terminals accept solid or stranded copper: 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or 2x 4 mm² per clamp, with AWG equivalents of 2x (20...16), 2x (18...14), or 1x 12. That's enough for daisy-chaining control wiring through the same terminal without a separate junction block. Shock resistance is 10g for 5 ms and 5g for 10 ms, so it survives shipping drops and moderate machine vibration. Contact reliability is rated at one incorrect switching operation per 100 million cycles at 17 V, 1 mA — that's dry-circuit capability for PLC-level signals, not just power contacts. The mechanical endurance is 30 million operating cycles typical.","metaTitle":"Siemens 3RH1140-1BD40 SIRIUS Auxiliary Contactor, S00, 42 V","metaDescription":"Siemens 3RH1140-1BD40 SIRIUS auxiliary contactor, size S00, 42 V DC coil, 4 NO + 0 NC contacts, 45 mm wide, IP20 front. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"72 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"45 mm","Height":"57.5 mm","Rated Value":"42 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","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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 %","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":"screw-type 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=422238&mlfb=3RH1140-1BD40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BD40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1140-1BD40 and get current pricing?","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 price and lead time."},{"question":"What is the closest functional second-source to 3RH1140-1BD40?","answer":"The 3RH2140-1BP40 is a peer in the same SIRIUS family but carries a different coil voltage and contact arrangement. The 3RH1140-1BD40 uses a 42 V DC coil with 4 NO contacts; verify the coil voltage and contact count before substituting. The physical footprint (S00 size, 45 mm width) and DIN-rail mounting are shared, so it may drop into the same panel slot without mechanical rework, but the wiring and coil supply must match."},{"question":"What is the depth of 3RH1140-1BD40?","answer":"The depth is 72 mm, with a width of 45 mm and height of 57.5 mm. This is the S00 size footprint for the SIRIUS auxiliary contactor range."},{"question":"What compliance documentation does Siemens provide for 3RH1140-1BD40?","answer":"The part carries RoHS compliance with a substance prohibition date of July 1, 2006. It is rated for surge voltage resistance of 6 kV and pollution degree 3 per IEC standards. The front protection class is IP20. Siemens typically provides a declaration of conformity for CE marking; specific UL/CSA listings should be verified against the nameplate marking on the unit received."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-1BD40","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/3RH1140-1BD40 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}}