{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2140-2XB40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2140-2XB40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RH2140-2XB40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2XB40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor relay, size S00, 4 NO instantaneous contacts, 24-34 VDC coil with varistor suppression, screw and snap-on 35 mm DIN rail mount, for railway applications.","salesMarkdown":"The Siemens SIRIUS 3RH2140-2XB40-0LA2 is a contactor relay designed for railway applications, carrying four instantaneous NO contacts and a 24-34 VDC coil with an integrated varistor surge suppressor. It mounts via screw or snap-on onto 35 mm DIN rail, occupying the S00 contactor footprint — 45 mm wide, 70 mm tall, 73 mm deep. Coil inrush peaks at 2.3 A; holding current settles to a mean 40 mA. Arcing time runs 10-15 ms, and the DC operate/release range is 25-45 ms. That 40 mA holding draw matters for a 24 VDC supply budget — it's low enough to daisy-chain multiple relays on one small PSU without voltage drop issues. The contacts are rated for switching across a wide voltage range, and the duty matters. At 400 V rated value it's 3 A; at 690 V rated value it's 1 A. The 440 V rated value drops to 0.5 A, and at 600 V rated value it's 0.26 A. These are not motor-starting currents — this is a contactor relay, not a power contactor. Use the 10 A figure for signal-level or resistive loads; derate aggressively for inductive DC loads. ## Integration notes Wire termination accepts 2x 0.5-4 mm² solid or stranded conductors. Side-by-side mounting is permitted — the 6 mm lateral clearance to adjacent devices is the minimum gap. The varistor suppressor is built in, so no external snubber is needed for coil suppression — verify polarity before energizing the DC coil. Relative humidity minimum is 10 %. The substance prohibition date is 10/01/2009, aligning with RoHS/REACH substance restrictions. No specific UL/CSA/CE marks are listed in the spec record, but the railway designation implies compliance with relevant rail standards (EN 50155 family).","metaTitle":"Siemens 3RH2140-2XB40-0LA2 SIRIUS Contactor Relay, Railway,","metaDescription":"Siemens SIRIUS 3RH2140-2XB40-0LA2 contactor relay for railway applications. 4 instantaneous contacts, 24-34 VDC coil, varistor suppression, screw/DIN rail mount. Current lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at DC":"25 ... 45 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 ... 34 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-40 ... +70 °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, standing, on horizontal mounting surface","Size Of Contactor":"S00","Solid Or Stranded":"2x (0,5 ... 4 mm²)","Product Brand Name":"SIRIUS","Inrush Current Peak":"2.3 A","Product Designation":"Contactor relay for railway applications","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","Side-By-Side Mounting":"Yes","Locked-Rotor Current Peak":"0.18 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"40 mA","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"Varistor","Duration Of Inrush Current Peak":"50 µs","Locked-Rotor Current Mean Value":"0.18 A","Duration Of Locked-Rotor Current":"250 ms","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"4 W","holding power of magnet coil at DC":"0.95 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","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","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","AWG number as coded connectable conductor cross section for auxiliary contacts":"20 ... 12","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","residual current of the electronics for control with signal <0> at DC at 24 V maximum permissible":"10 mA","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/02b06184cbc9874e32112be3683260d5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=765430&mlfb=3RH2140-2XB40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2140-2XB40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2140-2XB40-0LA2?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock or price figures are listed publicly."},{"question":"Will 3RH2140-2XB40-0LA2 drop into a panel specified around 3RH2140-1BP40 without rewiring?","answer":"Both parts share the SIRIUS S00 footprint and 35 mm DIN rail mounting, so the mechanical fit is identical. The 3RH2140-2XB40-0LA2 carries a 24-34 VDC coil with varistor suppression, while the -1BP40 variant may differ in coil voltage or suppressor design — check the coil rating on the nameplate before swapping."},{"question":"What is the depth of 3RH2140-2XB40-0LA2?","answer":"The depth is 73 mm. Width is 45 mm, height is 70 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2140-2XB40-0LA2","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/3RH2140-2XB40-0LA2 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}}