{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-2HB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-2HB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-2HB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2HB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS coupling relay, 3RH2140-2HB40, 24 VDC, 4 NO, 10 A, screw and snap-on DIN rail mounting.","salesMarkdown":"The 3RH2140-2HB40: The 10 A at 24 V is the thermal current (AC-1 / resistive load) — that's the continuous current the contacts can carry without welding or overheating. For DC switching at higher voltages, the rating drops: 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V. That DC derating curve matters because DC arcs don't self-extinguish at zero-crossing the way AC does; the relay's contact gap and arc-chamber design limit the interrupting ability. For AC loads, it handles 10 A at 230 V and 3 A at 400 V. Clearance around the relay: 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm to the side. Ambient operating temperature is -25 to +60 °C; storage range is -55 to +80 °C. The screw terminals accept 2 x 0.5 to 4 mm² solid or stranded wire.","metaTitle":"Siemens 3RH2140-2HB40 SIRIUS coupling relay, 24 VDC, 10 A","metaDescription":"Siemens SIRIUS 3RH2140-2HB40 coupling relay for auxiliary circuits, 24 VDC coil, 10 A rated, 4 NO contacts, screw and snap-on DIN rail mount, current production.","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","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":"0.7","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting 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","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","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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/589eabeea94709e61fa7fc0db603f02e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=75053&mlfb=3RH2140-2HB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2HB40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to the 3RH2140-2HB40?","answer":"The 3RT2026-1KB40 is a contactor, not a coupling relay, and shares the same size S00 footprint and 24 VDC coil voltage, but the 3RH2140-2HB40 is specifically a coupling relay with 4 NO auxiliary contacts rated 10 A. The 3RT2026-1KB40 is a power contactor with different contact ratings and arc chambers — it is not a direct functional replacement for the coupling relay application."},{"question":"What are the key dimensions of the 3RH2140-2HB40?","answer":"Height 70 mm, width 45 mm, depth 73 mm. It mounts on a 35 mm DIN rail with 10 mm clearance upward, forward, and downward, and 6 mm to the side."},{"question":"Does the 3RH2140-2HB40 drop into a panel originally specified for the 3RT2026-1KB40 without rewiring?","answer":"Both parts share the same size S00 footprint and mount on a 35 mm DIN rail, so the mechanical fit is the same. However, the 3RH2140-2HB40 is a coupling relay with 4 NO auxiliary contacts, while the 3RT2026-1KB40 is a power contactor — the terminal layouts and contact assignments differ. It will physically fit in the same DIN-rail slot, but the wiring must be verified against the circuit diagram for the new relay's contact arrangement."},{"question":"What compliance documentation does Siemens provide for the 3RH2140-2HB40?","answer":"The part carries a RoHS compliance date of 10/01/2009, indicating it meets the EU RoHS directive. Siemens typically provides CE, UL, CSA, and IEC declarations for the SIRIUS series — the specific certificates should be referenced on the manufacturer's documentation portal using the order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-2HB40","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/3RH2140-2HB40 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}}