{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-2LF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-2LF40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-2LF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2LF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2140-2LF40 coupling relay, size S00, 4 NO instantaneous contacts, 110 V AC coil with varistor, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"## What the 3RH2140-2LF40 is and what it switches The Siemens 3RH2140-2LF40 is a SIRIUS coupling relay — a size S00 auxiliary contactor designed for switching auxiliary circuits, not motor loads directly. Its four NO instantaneous contacts handle control signals, interlocks, and PLC outputs in panels where the main contactor stays dedicated to the power path. The 110 V AC coil includes an integrated varistor surge suppressor, which clips voltage spikes from the coil's magnetic field collapse — one less component to wire on the DIN rail. Rated 10 A at both 24 V and 230 V, the contacts carry full current at the two most common control voltages in industrial panels. At 110 V — the coil voltage of this unit — the switching capacity is 3 A. ## Lifecycle and sourcing — active production, quoted to order Pollution degree 3 means it tolerates conductive pollution in typical industrial environments.","metaTitle":"Siemens 3RH2140-2LF40 SIRIUS Coupling Relay, 110 V coil","metaDescription":"Siemens 3RH2140-2LF40 SIRIUS coupling relay, size S00, 4 NO contacts, 110 V coil with varistor. Rated 10 A at 230 V. Active production, sourced per RFQ.","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":"7 ... 20 ms","title":"3RH2140-2LF40","Height":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"110 V","description":"Coupling contactor relay railway 4 NO, 110 V DC, 0.7... 1.25* US, with integrated varistor, Size S00, Spring-type terminal","Initial Value":"0.7","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Full-Scale Value":"1.25","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 ... 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":"2.8 W","holding power of magnet coil at DC":"2.8 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 ... 12)","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.5 ... 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 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","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":"spring-loaded 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d578d643e7e2b8bed14fa216ae32ae6c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=474607&mlfb=3RH2140-2LF40"},"ai":{"faq":[{"question":"Does 3RH2140-2LF40 include a surge suppressor?","answer":"Yes, the coil has an integrated varistor surge suppressor — no external snubber needed for the 110 V AC coil."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-2LF40","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/3RH2140-2LF40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}