{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-1VB40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-1VB40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-1VB40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1VB40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2122-1VB40-1AA0, coupling contactor relay, 2 NO + 2 NC, 24 V DC coil with integrated diode, Size S00, screw terminal, upright mounting.","salesMarkdown":"The Siemens 3RH2122-1VB40-1AA0 is a Size S00 coupling contactor relay with 2 normally-open and 2 normally-closed contacts, a 24 V DC coil, and an integrated suppression diode. The 0.85...1.85* US operating range means the coil picks up reliably at 20.4 V DC and holds in through a 44.4 V DC surge — useful for control circuits with long cable runs or shared DC supplies where voltage drop is a concern. The integrated diode handles the inductive kickback on coil de-energization, so you don't need an external flyback diode across the coil terminals. ## Panel integration Size S00 footprint mounts on DIN rail in a control panel. The integrated diode means no extra wiring for coil suppression — one less component to fit in the trough.","metaTitle":"Siemens 3RH2122-1VB40-1AA0 Coupling Contactor Relay, 24 V DC","metaDescription":"Siemens 3RH2122-1VB40-1AA0 coupling contactor relay, 2 NO + 2 NC, 24 V DC, 0.85...1.85* US, integrated diode, Size S00, screw terminal. Current lifecycle stage. Quoted 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/1fce24edfae34e574cbd6c96c8d6c3c0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1684554&mlfb=3RH2122-1VB40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1VB40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest alternative to 3RH2122-1VB40-1AA0 in the same family?","answer":"Within the SIRIUS S00 family, the closest alternative is a coupling contactor relay with the same contact configuration and coil voltage but without the integrated diode — that variant requires an external suppression module (e.g., a separate RC snubber or free-wheel diode wired across the coil). The integrated diode on this version saves panel space and wiring time."},{"question":"Where can I buy 3RH2122-1VB40-1AA0?","answer":"This part is sourced and quoted to order through independent distribution against an RFQ. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-1VB40-1AA0","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/3RH2122-1VB40-1AA0 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}}