{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-4LV80-0LA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-4LV80-0LA0","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-4LV80-0LA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-4LV80-0LA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor relay for railway applications, 3RH2122-4LV80-0LA0, Size S00, 2 NO instantaneous contacts, varistor surge suppression, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"## Railway-rated contactor relay, Size S00 The Siemens SIRIUS 3RH2122-4LV80-0LA0 is a contactor relay explicitly designated for railway applications, carrying the SIRIUS brand and built in Size S00. It provides 2 normally open instantaneous contacts and integrates a varistor as the built-in surge suppressor. ## Switching ratings across DC and AC voltages This relay is rated for switching at multiple voltage levels. At 24 V rated value it handles 10 A, at 60 V rated value 4.7 A, 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, and at 690 V rated value 1 A.","metaTitle":"Siemens 3RH2122-4LV80-0LA0 SIRIUS Contactor Relay, Railway,","metaDescription":"Siemens SIRIUS contactor relay 3RH2122-4LV80-0LA0 for railway apps, 2 NO contacts, rated 10 A at 24 V DC, varistor suppression, 35 mm DIN rail. Current lifecycle stage. Sourced to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at DC":"7 ... 20 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":"34 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","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":"2.8 W","holding power of magnet coil at DC":"2.8 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","reference code according to IEC 81346-2":"K","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":"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":"ring terminal lug connection","insulation voltage with degree of pollution 3 at AC rated value":"690 V","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","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/8c7166f21d801a0ee8a6e10843b50c6e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=470387&mlfb=3RH2122-4LV80-0LA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-4LV80-0LA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RH2122-4LV80-0LA0?","answer":"The closest functional peer is the standard SIRIUS contactor relay 3RH2122-1BW40. The key difference is that the -4LV80-0LA0 variant carries the railway designation and includes a built-in varistor surge suppressor, whereas the -1BW40 is a general-purpose variant without the railway-specific rating and typically without the varistor. Both share the Size S00 footprint and 2 NO contact configuration, so panel fit is identical, but the -1BW40 lacks the 6 kV surge voltage resistance and the railway environmental qualification."},{"question":"Will 3RH2122-4LV80-0LA0 drop into a panel specified around 3RH2122-1BW40 without rewiring?","answer":"Yes, both parts share the same Size S00 footprint, 45 mm width, 73 mm depth, 70 mm height, and 35 mm DIN rail snap-on mounting. Terminal layout for the 2 NO contacts is identical. No rewiring is needed for the power contacts, though the varistor on the -4LV80-0LA0 may require verifying coil polarity if the original circuit assumed a different suppression method."},{"question":"What compliance documentation does this part provide?","answer":"The part carries a substance prohibition date of 10/01/2009, confirming RoHS compliance from that date. The railway designation implies compliance with relevant railway standards (EN 50155 family), though specific certification marks (UL, CSA, IEC) are not listed in the available specification data."},{"question":"Where can I buy 3RH2122-4LV80-0LA0?","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 price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-4LV80-0LA0","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/3RH2122-4LV80-0LA0 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}}