{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7420-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7420-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7420-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7420-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7420-8, 4-pole miniature circuit breaker, D tripping characteristic, 15 kA (EN 60898) / 25 kA (IEC 60947-2) breaking capacity, 400 V AC, 72 mm wide.","salesMarkdown":"## What this MCB does on the line At 72 mm wide (4 modular units), it occupies standard DIN-rail space; the quick-assembly system and any mounting position simplify panel integration. ## Breaking capacity and standards — what the ratings mean The 25 kA rating under IEC 60947-2 covers industrial installations where fault currents are higher — that's the number a panel designer uses for SCCR coordination. For UL 1077 / CSA C22.2 No.235, the breaker is listed at 5 kA, which is typical for supplementary protection in North American control panels. Ambient temperature range is -40 °C to 75 °C, with derating for humidity (95% at 55 °C, 55% at 70 °C, 35% at 75 °C). Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5 to 25 Hz and 50 m/s² at 25 to 150 Hz, which is typical for industrial machinery.","metaTitle":"Siemens 5SY7420-8 SENTRON MCB, 4P, D-curve, 15kA/25kA","metaDescription":"Siemens 5SY7420-8 SENTRON 4-pole miniature circuit breaker, D tripping characteristic, 15 kA per EN 60898 / 25 kA per IEC 60947-2. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"400 V","at DC rated value":"60 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to EN 60898 rated value":"15 kA","according to IEC 60947-2 rated value":"25 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage Of The Operating Voltage":"AC","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.6 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/671f6d1c24817ae78b05322180b77921.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=318251&mlfb=5SY7420-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7420-8/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY7420-8?","answer":"Submit an RFQ through this listing. The part is sourced through independent distribution; pricing and stock are confirmed at quote time."},{"question":"What is the closest functional second-source to 5SY7420-8?","answer":"The 5SY4304-7CV is a 4-pole MCB from the same SENTRON family, but it uses a C tripping characteristic (5–10x In) versus the D curve (10–20x In) of the 5SY7420-8. If your load has high inrush (motors, transformers), the D curve is the correct choice; the C curve may nuisance-trip on startup."},{"question":"What compliance documentation does Siemens provide for 5SY7420-8?","answer":"The breaker is certified to IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, and CSA C22.2 No.235. It is halogen-free and silicon-free. Standard documentation includes the declaration of conformity and manufacturer's test reports."},{"question":"Will 5SY7420-8 drop into a panel specified around 5SY4304-7CV without rewiring?","answer":"Yes — both are 4-pole, 72 mm wide (4 MW), and mount on the same DIN-rail footprint. The only difference is the tripping curve; wiring and busbar connections are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7420-8","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/5SY7420-8 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}}