{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"7SR2422-2NA11-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"7SR2422-2NA11-0BA0","canonicalUrl":"https://aoctrl.com/siemens/7SR2422-2NA11-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/7SR2422-2NA11-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens Duobias-M 7SR2422-2NA11-0BA0, multifunctional 2-winding transformer differential relay, 1/5 A measuring input, 40-160 V, 50/60 Hz.","salesMarkdown":"The Siemens 7SR2422-2NA11-0BA0 is a Duobias-M multifunctional 2-winding transformer differential relay, purpose-built for protecting power transformers against internal faults. It measures differential current between the primary and secondary windings, tripping on imbalance beyond the slope-characteristic setting. The measuring input is rated 1/5 A, 40-160 V, 50/60 Hz, covering standard CT and VT secondaries for medium-voltage transformer bays. Auxiliary supply is wide-range: 24-250 V DC or 100-230 V AC. The binary input threshold is set at 88 V DC, rated for 110-250 V DC control circuits — meaning it will not pick up on a 24 V DC trip signal, so verify your control voltage before wiring. Communication is dual-protocol: IEC 60870-5-103 and Modbus RTU, user-selectable via setting. The rear RS485 port handles the SCADA link; the front USB port is for local commissioning with the Reydisp software suite. ## Case, I/O, and what ships in the box This variant uses the case with 6 CT inputs, 2 EF/REF CT inputs, 1 VT input, 9 binary inputs, 6 binary outputs, and 16 programmable LEDs. The I/O count is fixed — no expansion modules in this order code. The relay ships with the standard communication interface (USB front port, RS485 rear port) and Protection Function Package B (standard version plus additional functions). No optional extras are needed for basic differential protection — the kit is complete as delivered.","metaTitle":"Siemens 7SR2422-2NA11-0BA0 Duobias-M Transformer Differentia","metaDescription":"Siemens 7SR2422-2NA11-0BA0 Duobias-M transformer differential relay. Rated 1/5 A, 40-160 V, 50/60 Hz. IEC 60870-5-103 & Modbus RTU. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["General Purpose Relays"],"specifications":{"Model":"7SR2 = Multifunctional 2- Winding Transformer Differential","title":"7SR2422-2NA11-0BA0","Protocol":"1 = IEC 60870-5-103 and Modbus RTU (user selectable setting)","Relay Type":"2 = Differential 2 Winding","Product No.":"7SR2422-2NA11-0BA0","description":"Duobias-M Transformer Differential Relay","Product Type":"Duobias-M Transformer Differential Relay","Measuring Input":"2 = 1/5 A, 40 - 160V, 50/60Hz","Shipping Weight":"9.0 Kg","lifecycle_stage":"current","Auxiliary voltage":"N = PSU Rated: 24-250V DC / 100-230V AC. Binary Input threshold 88V DC (Rated: 110-250V DC)","Protection Product":"4 = Transformer","Case I/O and Fascia":"2 = E8 case, 6 CT, 2 EF/REF CT, 1 VT, 9 Binary Inputs / 6 Binary Outputs, 16 LEDs","Estimated Lead Time":"6 - 8 Weeks.","Communication Interface":"1 = Standard version – included in all models, USB front port, RS485 rear port","Protection Function Packages":"B = Option B: Standard version – plus"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0045686a236a09caef10ab9c042980ad.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What communication protocols does this relay support?","answer":"It supports IEC 60870-5-103 and Modbus RTU, user-selectable via a setting. The rear RS485 port handles the SCADA link; the front USB port is for local commissioning."},{"question":"What is the auxiliary supply voltage range?","answer":"The auxiliary supply accepts 24-250 V DC or 100-230 V AC. The binary input threshold is 88 V DC, rated for 110-250 V DC control circuits."},{"question":"What measuring inputs does this relay accept?","answer":"It accepts 1/5 A CT inputs and 40-160 V VT inputs, at 50/60 Hz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/7SR2422-2NA11-0BA0","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/7SR2422-2NA11-0BA0 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}}