{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-1WB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-1WB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-1WB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-1WB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH2140-1WB40, 4 NO instantaneous contacts, 24 VDC coil, rated 10 A at 24 V, screw and snap-on mounting on 35 mm DIN rail, size S00.","salesMarkdown":"The Siemens SIRIUS 3RH2140-1WB40 is a coupling relay for switching auxiliary circuits, built into the S00 contactor footprint. It carries 4 normally-open instantaneous contacts and a 24 VDC coil with integrated varistor surge suppression. The S00 size (45 mm wide) matches the footprint of Siemens 3RT2 contactors in the same frame — it clips directly to the left or right of the contactor using the integrated snap-on feature. The 4 NO contacts are rated for AC switching at multiple voltages: 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 10 A at 230 V, 3 A at 400 V, 0.5 A at 440 V, 2 A at 500 V, 0.26 A at 600 V, and 1 A at 690 V. Arcing time runs 10 to 15 ms. The varistor surge suppressor across the coil absorbs back-EMF, which matters when the relay is driven by a PLC output — no external flyback diode needed. Wire termination accepts solid or stranded conductors: 2× (0.5 to 1.5 mm²), 2× (0.75 to 2.5 mm²), or 2× 4 mm². The product extension auxiliary switch is not included (no add-on block). Relative humidity minimum 10%.","metaTitle":"Siemens 3RH2140-1WB40 SIRIUS Coupling Relay, 4 NO, 24 VDC, 1","metaDescription":"Siemens SIRIUS 3RH2140-1WB40 coupling relay, 4 NO instantaneous contacts, 24 VDC coil, rated 10 A at 24 V. Screw and snap-on mounting on 35 mm DIN rail. Current production. Availab","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"5 ... 20 ms","Height":"57.5 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"24 V","Initial Value":"0.85","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +50 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Full-Scale Value":"1.85","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","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"Coupling relay for switching auxiliary circuits","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"10 A","at 400 V rated value":"3 A","at 440 V rated value":"0.5 A","at 500 V rated value":"2 A","at 600 V rated value":"0.26 A","at 690 V rated value":"1 A","Instantaneous Contact":"4","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"1.6 W","holding power of magnet coil at DC":"1.6 W","Surge Voltage Resistance Rated Value":"6 kV","operating frequency at DC-12 maximum":"1 000 1/h","operating frequency at DC-13 maximum":"1 000 1/h","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","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)","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","number of NO contacts for auxiliary contacts":"4","Type Of Voltage Of The Control Supply Voltage":"DC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Identification Number And Letter For Switching Elements":"40 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","design of the miniature circuit breaker for short-circuit protection of the auxiliary circuit up to 230 V":"C characteristic: 6 A; 0.4 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2f4cf3a7beed8de50b2ee2a028449949.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=264075&mlfb=3RH2140-1WB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2140-1WB40/alternatives.json"},"ai":{"faq":[{"question":"Will 3RH2140-1WB40 fit a panel designed for 3RH2122-1WB40?","answer":"Yes, both are S00 size with the same 45 mm width, 73 mm depth, and snap-on DIN-rail mounting. The terminal layout and clearance requirements are identical, so it drops in without rewiring or re-drilling."},{"question":"What compliance documentation is available for 3RH2140-1WB40?","answer":"The part is RoHS compliant with a substance prohibition date of 10/01/2009. It is designed to pollution degree 3 per IEC 60947-1. The manufacturer provides a CE declaration of conformity and UL/CSA recognition through the SIRIUS series listing; specific certification numbers are on the nameplate."},{"question":"How do I get current pricing and availability for 3RH2140-1WB40?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels — no stock figures or lead-time numbers are published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-1WB40","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/3RH2140-1WB40 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}}