{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-2XJ40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-2XJ40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-2XJ40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2XJ40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor relay for railway applications, 3RH2122-2XJ40-0LA2, size S00, 2 NO instantaneous contacts, varistor surge suppression, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"Mounts via screw or snap-on onto a standard 35 mm DIN rail — the S00 frame size keeps the footprint compact at 45 mm wide, 70 mm tall, and 73 mm deep. Side-by-side mounting is allowed, which is typical for a contactor relay bank. That matters when you're squeezing this into a railway cabinet with cable trays and other gear already in place. ## Switching performance and ratings across voltages The contactor relay is rated for a range of DC voltages beyond the typical 24 V and 230 V points: 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V, and 0.5 A at 440 V, plus 0.26 A at 600 V. That spread tells you the contacts are designed for moderate inductive loads across the railway voltage spectrum — not just one sweet spot. The arcing time sits between 10 and 15 ms, and the DC operate time is 25 to 45 ms. ## Coil power and environmental limits The DC magnet coil draws 4.5 W during closing and holds at 0.75 W — the holding power is low enough that a 24 V battery-backed supply won't be taxed across a bank of relays. Minimum relative humidity is 10 %, which is relevant for dry-climate or air-conditioned equipment rooms. The substance prohibition date of 2009-10-01 aligns with RoHS compliance — no lead or cadmium in the alloy.","metaTitle":"Siemens 3RH2122-2XJ40-0LA2 SIRIUS Contactor Relay, Railway,","metaDescription":"Siemens SIRIUS 3RH2122-2XJ40-0LA2 contactor relay for railway applications. Rated 10 A at 24 V and 230 V, 2 NO contacts, varistor suppression, screw/snap-on 35 mm rail. Active prod","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":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"72 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 ... 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":"2","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 ... 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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=765427&mlfb=3RH2122-2XJ40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2XJ40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source — 3RH2422-1AB00?","answer":"The 3RH2422-1AB00 is a functional peer within the SIRIUS contactor relay family, but verify the contact configuration (NO/NC count) and coil voltage rating before substituting — the 3RH2122-2XJ40-0LA2 carries 2 NO contacts and a varistor suppressor, which may differ."},{"question":"Will it drop into a panel specified around 3RH2422-1AB00 without rewiring?","answer":"Both are SIRIUS S00 contactor relays on a 35 mm DIN rail, so the mechanical footprint and rail mounting are the same. Check the contact arrangement: the 3RH2122-2XJ40-0LA2 has 2 NO instantaneous contacts; if the 3RH2422-1AB00 uses a different contact count or includes NC contacts, the wiring will differ. Also verify the coil voltage — this unit includes a varistor suppressor, which the other may not."},{"question":"What compliance documentation does this part carry?","answer":"The substance prohibition date of 2009-10-01 indicates RoHS compliance. The part is designed for railway applications, which typically requires EN 50155 or similar rolling stock standards — but the evidence does not list specific UL, CSA, or IEC certifications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-2XJ40-0LA2","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/3RH2122-2XJ40-0LA2 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}}