{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-1VB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-1VB40","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-1VB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1VB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, coupling relay for switching auxiliary circuits, 3RH1140-1VB40, 24 V DC coil, 4 NO contacts, 10 A rated at 24 V, size S00, screw and snap-on mounting, IP20 front.","salesMarkdown":"The Siemens SIRIUS 3RH1140-1VB40 is a coupling relay designed for switching auxiliary circuits in control panels. It carries a 24 V DC coil, four normally-open (NO) instantaneous contacts, and is rated to switch 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V (AC duty). The coil holds at 1.4 W DC, with a pickup voltage of 0.85 x rated value and dropout at 1.85 x rated value — meaning it pulls in reliably at 20.4 V and drops out above 44.4 V, a wide hysteresis that prevents chatter on sagging supplies. The 3RH1140-1VB40 fits the SIRIUS S00 contactor footprint — 45 mm wide, 57.5 mm high, 72 mm deep — and mounts via screw or snap-on onto a DIN rail. Wire terminals accept solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm². ## Ratings in context Shock resistance is 10g for 5 ms and 5g for 10 ms, covering most industrial vibration profiles.","metaTitle":"Siemens SIRIUS 3RH1140-1VB40 Coupling Relay, 24 V DC, 4 NO,","metaDescription":"Siemens SIRIUS 3RH1140-1VB40 coupling relay for switching auxiliary circuits. 24 V DC coil, 4 NO contacts, rated 10 A at 24 V. Size S00, screw/snap-on mount, IP20 front. Active pro","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":"24 V","Initial Value":"0.85","Leading Contact":"0","lifecycle_stage":"current","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":"Coupling relay for switching auxiliary circuits","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","Design Of The Surge Suppressor":"with diode","protection class IP on the front":"IP20","Ambient Temperature During Storage":"-55 ... +80 °C","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","reference code acc. to IEC 81346-2":"K","Ambient Temperature During Operation":"-25 ... +60 °C","Ambient Temperature During Transport":"-55 ... +80 °C","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","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","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=13937&mlfb=3RH1140-1VB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-1VB40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH1140-1VB40?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment."},{"question":"What is the closest second-source to 3RH1140-1VB40?","answer":"The 3RH2122-1WB40 is a functionally similar SIRIUS coupling relay but with a different contact configuration (2 NO + 2 NC vs the 4 NO of this part) and a 24 V AC/DC coil. It shares the S00 footprint and DIN-rail mount, so it drops into the same panel without rewiring the base, but verify the contact arrangement matches your circuit before substituting."},{"question":"What is the depth of 3RH1140-1VB40?","answer":"The depth is 72 mm, with a width of 45 mm and height of 57.5 mm — the standard SIRIUS S00 contactor footprint."},{"question":"What wire sizes does 3RH1140-1VB40 accept?","answer":"The screw terminals accept solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² per clamp."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-1VB40","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/3RH1140-1VB40 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}}