{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3RH1140-1BW40, 4 NO contacts, 48 V DC coil, screw and snap-on mounting, IP20 front.","salesMarkdown":"The screw and snap-on mounting fits standard DIN rail; the IP20 front face protects against tool probes in an enclosed panel. The four NO contacts are rated for AC switching at several voltage levels: 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. For DC control circuits, the contacts carry 1 A at 110 V and 0.27 A at 220 V. These are the thermal current ratings — derate if you are switching inductive loads or running multiple contacts in series. ## Coil and environmental limits The DC coil draws 3.2 W both during pickup and hold — no power drop after closure, so factor that into your 24 VDC supply budget if the contactor is held continuously. The unit withstands 6 kV surge voltage, which covers most installation categories up to 300 V phase-to-earth. ## Wiring and mechanical fit Terminals accept solid conductors: two wires of 0.5–1.5 mm², two of 0.75–2.5 mm², or a single 4 mm² per clamp. The 45 mm width, 57.5 mm height, and 72 mm depth match the SIRIUS S00 footprint — it occupies one standard 45 mm module on a DIN rail. Shock resistance is rated at 10g for 5 ms and 5g for 10 ms.","metaTitle":"Siemens 3RH1140-1BW40 SIRIUS Auxiliary Contactor, 4 NO, 48 V","metaDescription":"Siemens SIRIUS 3RH1140-1BW40 auxiliary contactor, size S00, 4 NO contacts, 48 VDC coil. IP20 front, screw/snap-on mounting. Active production. Quoted 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":"48 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)":"01.07.2006 00:00:00","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","reference code acc. to IEC 81346-2":"K","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","with low demand rate acc. to SN 31920":"40 %","with high demand rate acc. to SN 31920":"75 %","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","Of Auxiliary Contacts Instantaneous Contact":"0","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","B10 value with high demand rate acc. to SN 31920":"1 000 000; With 0.3 x Ie","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=195681&mlfb=3RH1140-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1BW40/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of 3RH1140-1BW40?","answer":"Four NO contacts rated 10 A at 24 V AC, 6 A at 230 V, 3 A at 400 V; DC coil 48 V, 3.2 W; size S00; IP20 front; screw/snap-on DIN-rail mount."},{"question":"Where can I buy 3RH1140-1BW40?","answer":"We source and quote this part to order against an RFQ 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/3RH1140-1BW40","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/3RH1140-1BW40 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}}