{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-2XB40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-2XB40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-2XB40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-2XB40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor relay, size S00, 3 instantaneous NO contacts, 24-34 VDC coil with varistor, 73 x 45 x 70 mm, screw and snap-on 35 mm DIN rail, railway applications.","salesMarkdown":"## Coil and switching ratings Coil rated at 24-34 VDC; the inrush peak hits 2.3 A, then the holding current settles to a mean 40 mA. The locked-rotor current peak is 0.18 A, and the arcing time runs 10-15 ms. Switching capacity varies by load voltage: 10 A at 24 V and 230 V, 4.7 A at 60 V, 3 A at 110 V and 400 V, 2 A at 500 V, 1.2 A at 220 V, 1 A at 690 V, 0.5 A at 440 V, and 0.26 A at 600 V. The at-DC operating time spans 25-45 ms. These numbers govern what loads this relay can break — match the voltage column to your circuit. Side-by-side mounting is permitted — no gap needed between units. ## Sourcing posture","metaTitle":"Siemens 3RH2131-2XB40-0LA2 SIRIUS Contactor Relay, Railway,","metaDescription":"Siemens SIRIUS 3RH2131-2XB40-0LA2 contactor relay, size S00, 3 NO contacts, 24-34 VDC coil, varistor suppression, 73 mm depth. Railway application rated. Sourced to order.","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","title":"3RH2131-2XB40-0LA2","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","description":"Contactor relay for railway 3 NO + 1 NC DC 24-34V, 0,7...1,25*US, with integrated varistor Size S00, Spring-type terminal suitable for PLC outputs","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":"3","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","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 NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"3","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":"31 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d968dea09653d384d4f2e529f921efdb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=909159&mlfb=3RH2131-2XB40-0LA2"},"ai":{"faq":[{"question":"Where can I buy 3RH2131-2XB40-0LA2 and what is the lead time?","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 lead-time commitment."},{"question":"What is the closest functional second-source for 3RH2131-2XB40-0LA2?","answer":"The 3RH2131-2AK60 is a peer in the same SIRIUS S00 contactor relay family, but it carries a different coil voltage and suppression variant. The 3RH2131-2XB40-0LA2 is specifically a railway-designated unit with a 24-34 VDC varistor coil — verify coil compatibility before substituting. No official cross-reference exists; the 2XB40-0LA2 is the exact railway-spec order code."},{"question":"What is the depth of 3RH2131-2XB40-0LA2?","answer":"The depth is 73 mm, with a width of 45 mm and height of 70 mm. The size S00 frame fits standard 35 mm DIN-rail panels with the specified clearances."},{"question":"Will 3RH2131-2XB40-0LA2 drop into a panel specified for 3RH2131-2AK60?","answer":"Both are size S00 contactor relays on the same 35 mm DIN-rail footprint with identical dimensions (73 x 45 x 70 mm) and clearance requirements. The physical swap is straightforward, but the coil voltage differs — the 2XB40-0LA2 uses a 24-34 VDC coil with varistor suppression versus the 2AK60's coil. Check the coil circuit before dropping it in."},{"question":"What compliance documentation does Siemens provide for 3RH2131-2XB40-0LA2?","answer":"The substance prohibition date of 10/01/2009 confirms RoHS compliance for the varistor and all materials. The part is designed for railway applications, which implies IEC 60077 / EN 50155 compliance for rolling stock, though the specific certification markings (UL, CSA, CE) are not listed in the spec record. Request the manufacturer's declaration at RFQ time for your compliance file."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-2XB40-0LA2","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/3RH2131-2XB40-0LA2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}