{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-2SB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-2SB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-2SB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2SB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2140-2SB40 coupling relay, size S00, 4 NO instantaneous contacts, 24 VDC coil with integrated suppressor diode, screw and snap-on mounting on 35 mm DIN rail, 45 x 70 x 73 mm.","salesMarkdown":"## What this coupling relay does that a standard contactor cannot The 3RH2140-2SB40 is a SIRIUS coupling relay purpose-built for switching auxiliary circuits — not main motor loads. Its 4 NO instantaneous contacts are rated 10 A at both 24 V rated value and 230 V rated value, covering the signal-level switching that a power contactor's aux contacts typically cannot handle at lower voltages without derating. ## Panel fit and DIN-rail integration Size S00 frame with a footprint of 45 mm width, 70 mm height, and 73 mm depth. ## Coil and surge suppression — what the 24 VDC rating means for the control loop Rated coil voltage is 24 VDC, with a closing power of 1.6 W. The integrated suppressor diode clamps the inductive kickback on de-energisation — no external flyback diode needed across the coil.","metaTitle":"Siemens 3RH2140-2SB40 SIRIUS Coupling Relay, 4 NO","metaDescription":"Siemens 3RH2140-2SB40 SIRIUS coupling relay, size S00, 4 NO contacts, 24 VDC coil with suppressor diode. Active production, sourced to order against 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":"5 ... 20 ms","title":"3RH2140-2SB40","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","description":"Coupling contactor relay, 4 NO, 24 V DC, 0.85... 1.85* US, with integrated suppressor diode, Size S00, Spring-type terminal","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 standard mounting 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":"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","at AWG cables for auxiliary contacts":"2x (20 ... 12)","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","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/05911f4c8d7ab8ae9963816f81713b27.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=423814&mlfb=3RH2140-2SB40"},"ai":{"faq":[{"question":"Where can I buy 3RH2140-2SB40 and how do I get a price?","answer":"This part is available through independent distribution and is quoted to order against your BOM quantity. Submit an RFQ for current pricing and lead-time confirmation — no stock-holding claim is made here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-2SB40","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/3RH2140-2SB40 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}}