{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-2VB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-2VB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-2VB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2VB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH2140-2VB40, size S00, 4 NO instantaneous contacts, 24 VDC coil, 10 A rated, screw and snap-on 35 mm DIN rail mount.","salesMarkdown":"The Siemens 3RH2140-2VB40 is a SIRIUS coupling relay for switching auxiliary circuits — the kind of part that sits between a PLC output and a contactor coil, or routes signals across a panel. Size S00 footprint (70 mm tall, 45 mm wide, 73 mm deep) with screw and snap-on mounting onto 35 mm DIN rail, so it drops into any standard enclosure rail without a sub-panel. Coil is 24 VDC with a pickup threshold of 0.85 x rated (about 20.4 V) and a dropout of 1.85 x rated — meaning it holds in cleanly down to about 20 V and won't drop out on a sag to 18 V, but releases reliably when the control voltage goes above 44 V. Built-in diode surge suppressor across the coil, so you don't need an external flyback diode for inductive load switching. That saves a component and a wiring step at the panel. Minimum clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side — tight enough for dense rail packing, but keep the 10 mm vertical gap for airflow and wiring access. Strip length is standard; torque to the usual 0.8–1.2 Nm range for this class. Ambient operation -25 to +50 °C, storage -55 to +80 °C, with 10% minimum relative humidity and pollution degree 3 (conductive or dry non-conductive with condensation). Fine for most industrial control panels, including non-climate-controlled cabinets. ## Switching performance and contact ratings Rated operational current across the voltage range: 10 A at 24 V, 10 A at 230 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 3 A at 400 V, 0.5 A at 440 V, 2 A at 500 V, 0.26 A at 600 V, 1 A at 690 V. Mechanical endurance: 30 million operating cycles typical. Coil power consumption at DC: 1.6 W closing power — low enough to drive from a standard 24 VDC PLC output without an interposing relay in most cases.","metaTitle":"Siemens 3RH2140-2VB40 SIRIUS Coupling Relay, 4 NO, 24 VDC, 1","metaDescription":"Siemens SIRIUS 3RH2140-2VB40 coupling relay for auxiliary circuits. 4 instantaneous contacts, 24 VDC coil, 10 A rated. Screw and snap-on DIN rail mount. Current production, sourced","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":"20 ... 80 ms","Height":"70 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 ... 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":"diode","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 ... 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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bdf70b99c8263635c6395df1e18f6917.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=464456&mlfb=3RH2140-2VB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2VB40/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for the 3RH2140-2VB40?","answer":"4 NO instantaneous contacts, each rated 10 A at 24 V and at 230 V. Coil is 24 VDC with built-in diode suppression. Size S00, screw and snap-on DIN rail mount."},{"question":"Where can I buy the 3RH2140-2VB40 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":"Will the 3RH2140-2VB40 drop into a panel built around the 3RH2122-1WB40?","answer":"Both are S00 size and mount on 35 mm DIN rail, so the footprint and rail position are identical. The 3RH2140-2VB40 has 4 NO contacts; the 3RH2122-1WB40 has 2 NO + 2 NC. If the panel wiring expects the NC pair, you'd need to re-terminate or add a separate NC block. Otherwise the mechanical fit is the same."},{"question":"What compliance documentation does Siemens provide for the 3RH2140-2VB40?","answer":"The part carries a substance prohibition date of 10/01/2009, which aligns with RoHS and REACH compliance requirements. Standard Siemens documentation includes a CE declaration and manufacturer's declaration for the SIRIUS product family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-2VB40","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/3RH2140-2VB40 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}}