{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-2LV40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-2LV40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-2LV40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2LV40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RH2122-2LV40, coupling contactor relay railway, 2 NO + 2 NC, 36 V DC, 0.7... 1.25* US, with varistor integrated, frame size S00, spring-loaded terminal.","salesMarkdown":"The Siemens 3RH2122-2LV40 is a coupling contactor relay built for railway applications. It carries 2 normally-open and 2 normally-closed contacts, with a 36 V DC coil that picks up from 0.7 to 1.25 times the rated control supply voltage. A varistor is integrated across the coil to suppress switching transients — no external snubber needed on the DC side. The relay is housed in frame size S00 and terminated with spring-loaded terminals, so wiring is a push-in job, no screwdriver required. The 36 V DC coil with a 0.7 to 1.25 times US operating range means the relay picks up reliably anywhere from about 25 V to 45 V DC — important if your DC bus sags under load or floats high on a floating battery bank. The integrated varistor clamps inductive kickback at the source, which keeps the EMI off the rest of the control loop. Spring-loaded terminals accept 0.2 to 2.5 mm² solid or ferruled stranded wire; strip length is 8 mm.","metaTitle":"Siemens 3RH2122-2LV40 Coupling Contactor Relay, 36 V DC, 2 N","metaDescription":"Siemens 3RH2122-2LV40 coupling contactor relay railway, 36 V DC coil, 2 NO + 2 NC, integrated varistor, frame size S00, spring-loaded terminal. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/48629698210ae2108567b3178d334a46.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1667126&mlfb=3RH2122-2LV40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-2LV40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2122-2LV40 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead time and price."},{"question":"What is the coil voltage range for 3RH2122-2LV40?","answer":"The coil operates from 0.7 to 1.25 times the rated 36 V DC control supply, so the pickup range is roughly 25 V to 45 V DC."},{"question":"Does 3RH2122-2LV40 have a built-in suppressor?","answer":"Yes, a varistor is integrated across the coil. No external snubber or free-wheel diode is required for DC switching."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-2LV40","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/3RH2122-2LV40 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}}