{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-2XB40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-2XB40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-2XB40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2XB40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor relay, size S00, 2 instantaneous NO contacts, 24-34 VDC coil with varistor, screw and snap-on 35 mm DIN rail, 73 mm depth, 45 mm width.","salesMarkdown":"## Railway-rated contactor relay, S00 frame It carries 2 instantaneous normally-open contacts and a 24-34 VDC rated coil with an integrated varistor surge suppressor. ## Coil and contact ratings for the railway environment Coil pick-up is rated at 24-34 VDC with an inrush peak of 2.3 A and a holding current mean value of 40 mA. The contactor relay switches resistive loads up to 10 A at 24 VDC and 10 A at 230 VAC; at 400 VAC the rating drops to 3 A. Arcing time runs 10-15 ms, and the mechanical life of the contactor typical is 30 million operations. The varistor suppressor is designed into the coil circuit, so no external suppression module is needed for DC switching. Side-by-side mounting is permitted, which matters when packing multiple relays in a row on the rail. ## Environmental range and wiring Relative humidity minimum is 10 %. The contactor relay is rated for DC switching with a time constant of 25-45 ms at DC.","metaTitle":"Siemens 3RH2122-2XB40-0LA2 SIRIUS Contactor Relay, 24-34 VDC","metaDescription":"Siemens SIRIUS 3RH2122-2XB40-0LA2 contactor relay for railway applications. Size S00, 2 NO contacts, 24-34 VDC coil, varistor suppression. Screw and snap-on 35 mm DIN rail. Quoted","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":"3RH2122-2XB40-0LA2","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 2 NO + 2 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":"2","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 NC contacts for auxiliary contacts":"2","number of NO contacts for auxiliary contacts":"2","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":"22 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":"$36.83","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fd5f0a6865a3c61ace84f439d9e238b8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=765423&mlfb=3RH2122-2XB40-0LA2"},"ai":{"faq":[{"question":"Where can I buy 3RH2122-2XB40-0LA2?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional alternative to 3RH2122-2XB40-0LA2?","answer":"The 3RH2122-1BA40 is a sibling in the same SIRIUS S00 family but lacks the varistor suppressor and the railway designation. It will drop into the same DIN-rail footprint and wiring pattern, but the coil suppression and environmental ratings differ — verify the application before substituting."},{"question":"What are the key dimensions of 3RH2122-2XB40-0LA2?","answer":"Depth is 73 mm, width is 45 mm, height is 70 mm. Clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side."},{"question":"What compliance documentation does this part carry?","answer":"The substance prohibitance date of 10/01/2009 confirms RoHS compliance. As a Siemens SIRIUS product, it is designed to relevant IEC and EN standards for contactors and railway rolling stock applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-2XB40-0LA2","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/3RH2122-2XB40-0LA2 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}}