{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-1XG40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-1XG40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-1XG40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-1XG40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor relay for railway applications, size S00, 3 instantaneous NO contacts, DC-operated, screw and snap-on mounting on 35 mm DIN rail, 73 x 45 x 58 mm.","salesMarkdown":"It carries three instantaneous normally-open contacts and is driven by a DC coil with a built-in varistor surge suppressor. The part screws or snaps onto a standard 35 mm DIN rail, occupying a 45 x 58 mm footprint and 73 mm depth — a panel-builder's dimension that fits alongside other S00 auxiliaries without crowding. ## DC switching ratings — what the voltage columns mean This relay's DC switching capability is given as a table of rated values per voltage, not a single blanket current. At 24 V it switches 10 A; at 60 V, 4.7 A; at 110 V, 3 A; at 220 V, 1.2 A; at 440 V, 0.5 A; at 600 V, 0.26 A. There are also AC-rated entries at 230 V (10 A), 400 V (3 A), 500 V (2 A), and 690 V (1 A). The pattern is the classic DC arc-extinction curve — the same contact set that handles 10 A at 24 V is derated to a quarter-amp at 600 V. ## Coil and timing behaviour The DC magnet coil draws 4.5 W to close and holds at 0.75 W — a four-to-one ratio that keeps the solenoid seated without overheating the coil on continuous duty. Closing time is 25 to 45 ms, arcing time 10 to 15 ms. The built-in varistor clips the inductive kick on de-energisation; a free-wheel diode is not required but verify polarity if one is added externally. ## Mounting and environmental envelope","metaTitle":"Siemens 3RH2131-1XG40-0LA2 SIRIUS Contactor Relay, Railway,","metaDescription":"Siemens 3RH2131-1XG40-0LA2 SIRIUS contactor relay for railway applications. Size S00, 3 NO contacts, DC coil, 73x45x58 mm, snap-on DIN rail. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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":"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 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 ... 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","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 ... 16), 2x (18 ... 14), 2x 12","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=765428&mlfb=3RH2131-1XG40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2131-1XG40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2131-1XG40-0LA2 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead-time and price."},{"question":"What is the closest functional second-source to 3RH2131-1XG40-0LA2?","answer":"The 3RH2140-1BP40 is a peer in the same SIRIUS contactor relay family, but it carries a different contact configuration and coil voltage. The 3RH2131-1XG40-0LA2 is specifically designated for railway applications and has a DC coil with varistor suppression. A direct drop-in without rewiring is not guaranteed — verify the contact arrangement and coil rating against your circuit before substituting."},{"question":"What compliance documentation does this brand provide for 3RH2131-1XG40-0LA2?","answer":"The evidence records a substance prohibitance date of 10/01/2009, indicating RoHS compliance for that effective date. Standard Siemens SIRIUS documentation includes a declaration of conformity and environmental compliance sheet; request these with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-1XG40-0LA2","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/3RH2131-1XG40-0LA2 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}}