{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-1XF40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-1XF40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-1XF40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-1XF40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor relay for railway applications, 3RH2131-1XF40-0LA2, 72-125 VDC coil, 3 NO instantaneous contacts, screw and snap-on 35 mm DIN rail mounting, size S00.","salesMarkdown":"Terminals accept solid or stranded copper: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or a single 2x 4 mm². That covers standard panel wire up to 12 AWG. Coil power draw: 4.5 W closing, 0.75 W holding — the holding power is low enough that a 24 VDC control supply can run several relays without overloading a small PSU. The substance prohibition date of 10/01/2009 aligns with the original RoHS compliance deadline; the part meets RoHS and REACH requirements for railway equipment. Operating temperature range: -40 to +70 °C; storage: -55 to +80 °C — covers the full EN 50155 T1/T2 class range.","metaTitle":"Siemens 3RH2131-1XF40-0LA2 SIRIUS Contactor Relay, 72-125 VD","metaDescription":"Siemens SIRIUS 3RH2131-1XF40-0LA2 contactor relay for railway applications. 72-125 VDC coil, 3 NO contacts, 10 A at 24 V. Screw/snap-on 35 mm DIN rail. RoHS compliant. Sourced to o","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":"58 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"72 ... 125 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 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, standing, on horizontal mounting surface","Size Of Contactor":"S00","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","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","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"Varistor","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"4.5 W","holding power of magnet coil at DC":"0.75 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 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 ... 1.5 mm²), 2x (0.75 ... 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 %","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":"screw-type 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/dc0622a4b072ded3c8fd5d9f5a0123a6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=912130&mlfb=3RH2131-1XF40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2131-1XF40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RH2131-1XF40-0LA2?","answer":"The closest functional peer is 3RH2122-1BW40 — same S00 size, same 3 NO contact configuration, and same 35 mm DIN rail mounting. The key difference is the coil voltage: the 3RH2122-1BW40 is rated for a different coil voltage range, so verify your control supply before substituting. The 3RH2140-1BP40 and 3RH2122-1BA40 are also S00-size contactor relays but with different coil ratings or contact arrangements."},{"question":"Will 3RH2131-1XF40-0LA2 drop into a panel specified around 3RH2122-1BW40 without rewiring?","answer":"Yes, the mounting footprint is identical — both are S00 size, 45 mm wide, snap onto 35 mm DIN rail, and share the same clearance requirements (10 mm upwards, forwards, downwards; 6 mm side). The terminal layout and wire sizes (2x 0.5–2.5 mm²) are also the same, so no panel rework is needed. Just confirm the coil voltage matches your control circuit."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-1XF40-0LA2","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/3RH2131-1XF40-0LA2 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}}