{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH1140-2KJ80","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH1140-2KJ80","canonicalUrl":"https://aoctrl.com/siemens/3RH1140-2KJ80","factsUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2KJ80","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay for switching auxiliary circuits, 4 NO instantaneous contacts, 72 V DC coil with varistor, 10 A at 24 V, size S00, screw and snap-on mounting, IP20 front.","salesMarkdown":"The Siemens 3RH1140-2KJ80 is a SIRIUS coupling relay — a contactor-style auxiliary relay designed to switch control circuits in motor starter and PLC output panels. It carries 4 normally-open instantaneous contacts and a 72 V DC coil with an integrated varistor surge suppressor. The relay snaps onto a DIN rail or screws directly to a mounting plate, and its size S00 footprint (45 mm wide, 60 mm tall, 73 mm deep) fits standard panel layouts alongside S00 contactors. The coil draws 2.3 W on closing and holds at 2.3 W DC — no inrush spike beyond the steady-state power. That matters for PLC output cards or DC supplies with limited per-channel current; the relay won't pull more than its rated holding power once sealed. ## Contact ratings — the so-what The contacts are rated 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. These are thermal current ratings for AC loads — the relay switches auxiliary circuits, not motor power. At 110 V the rating drops to 1 A, and at 220 V to 0.27 A, so if you're switching a 110 V control transformer secondary, verify the load stays under 1 A. The 4 NO contacts are all independent; there are no NC or changeover contacts on this variant. For gold-flashed or low-level signal switching, this relay is rated for it. That gives flexibility in tight enclosures — you can orient the relay to align with wireways. Shock resistance is 10g / 5 ms and 5g / 10 ms — adequate for panel-mounted equipment in machinery with moderate vibration.","metaTitle":"Siemens 3RH1140-2KJ80 SIRIUS Coupling Relay, 4 NO, 72 V DC,","metaDescription":"Siemens 3RH1140-2KJ80 SIRIUS coupling relay, 4 NO contacts, 72 V DC coil, 10 A at 24 V. Current production. Sourced to order against RFQ. Depth 73 mm, screw/snap-on mounting.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"60 mm","Rated Value":"72 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"1.25","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)":"07/01/2006","Design Of The Surge Suppressor":"with varistor","protection class IP on the front":"IP20","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.3 W","holding power of magnet coil at DC":"2.3 W","Surge Voltage Resistance Rated Value":"6 kV","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (24 ... 14)","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Touch Protection Against Electrical Shock":"finger-safe","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Of Auxiliary Contacts Instantaneous Contact":"0","with high demand rate according to SN 31920":"75 %","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","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":"Cage Clamp 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=357883&mlfb=3RH1140-2KJ80","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH1140-2KJ80/alternatives.json"},"ai":{"faq":[{"question":"What is 3RH1140-2KJ80's depth?","answer":"73 mm."},{"question":"What wire size does the 3RH1140-2KJ80 accept?","answer":"The solid terminals accept 2 conductors of 0.25 to 2.5 mm² each."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH1140-2KJ80","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/3RH1140-2KJ80 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}}