{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7408-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7408-7","canonicalUrl":"https://aoctrl.com/siemens/5SY7408-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7408-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY7408-7, 4-pole C-curve, 8 A, 400 V AC, 15 kA interrupting capacity per EN 60898.","salesMarkdown":"## What it is and what it does The Siemens SENTRON 5SY7408-7 is a 4-pole miniature circuit breaker with a C tripping characteristic, rated 8 A at 400 V AC. It interrupts faults up to 15 kA per EN 60898 and 30 kA per IEC 60947-2, so it handles both residential-grade and industrial fault currents without cascading upstream. The C-curve means it tolerates moderate inrush — typical for motor starters, pumps, and small transformers — without nuisance tripping, while still clearing overloads fast enough to protect the circuit. ## Where it fits Snaps onto DIN rail via the quick-assembly system, occupies 4 modular width units (72 mm wide), and mounts in any position. IP20 with connected conductors means it is meant for enclosed panels, not wet or outdoor locations. The 76 mm depth and 70 mm installation depth leave room for wiring in standard 80 mm deep enclosures. Combined terminals top and bottom accept both busbar and cable — no need to swap terminal types. ## Compliance and approvals Rated for overvoltage category III, pollution degree 3, and vibration resistance per IEC 60068-2-6. Halogen-free and silicon-free construction. UL 1077 and CSA C22.2 No. 235 listing at 5 kA extends its acceptance in North American panels.","metaTitle":"Siemens SENTRON 5SY7408-7 MCB, 4P C 8A 400V 15kA","metaDescription":"Siemens SENTRON 5SY7408-7 miniature circuit breaker, 4-pole C-curve, 8 A, 400 V AC, 15 kA (EN 60898). Active production. Quoted to order.","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","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","Type Of Voltage":"AC","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"400 V","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"4P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","acc. to EN 60898 / rated value":"15 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"30 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","operational current / at AC / rated value":"8 A","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=246509&mlfb=5SY7408-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7408-7/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY7408-7 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is 5SY7408-7's interrupting rating?","answer":"15 kA per EN 60898, 30 kA per IEC 60947-2, and 5 kA per UL 1077 / CSA C22.2 No. 235."},{"question":"What compliance documentation does this brand provide?","answer":"The part carries IEC, EN, UL, and CSA ratings as listed; it is halogen-free and silicon-free."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7408-7","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/5SY7408-7 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}}