{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8640-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8640-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8640-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8640-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, miniature circuit breaker, 5SY8640-7, 4-pole C-curve 40 A, 25 kA IEC 60947-2, 400 V AC, 4 MW units, IP20.","salesMarkdown":"## 40 A C-curve MCB, 4-pole, 25 kA — SENTRON 5SY8640-7 It carries a 25 kA breaking capacity per IEC 60947-2 at 400 V AC, with a 15 kA DC rating and 5 kA per UL 1077/CSA 22.2 No.235 — so it handles both IEC and North American fault-current requirements on the same device. At 40 A it covers sub-distribution, lighting panels, and general branch circuits in industrial and commercial panels. ## Breaking capacity — IEC, UL, and DC Three breaking-capacity ratings cover the common installation regimes: 25 kA at 400 V AC per IEC 60947-2 (the main specification for industrial MCBs in Europe and Asia), 15 kA at 72 V DC for DC-side protection, and 5 kA per UL 1077 / CSA 22.2 No.235 for North American supplementary protection. That 25 kA IEC figure means it can be used at the service entrance of most industrial sub-distribution boards without an upstream current-limiting fuse. Snap-on fastening with any mounting position. Combined top and bottom terminals simplify daisy-chaining busbars. Sealable and touch-protected per the product feature. Halogen-free and silicon-free construction suits clean-room or sensitive-environment panels. Neutral conductor switching is integrated (3P+N), so the neutral pole opens and closes with the phases — no separate neutral disconnect required. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.","metaTitle":"Siemens 5SY8640-7 SENTRON MCB, 4P C-40A 25kA IEC","metaDescription":"Siemens 5SY8640-7 SENTRON miniature circuit breaker, 4-pole C-curve 40 A, 25 kA breaking capacity per IEC 60947-2. Current production. Sourced 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","Rated Value":"50/60 Hz","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","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"3P+N","acc. to DIN EN 61346-2":"F","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","at DC / rated value / maximum":"72 V","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"25 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","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":"40 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":"Yes","with multi-phase operation / at AC / rated value":"440 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=29283&mlfb=5SY8640-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8640-7/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY8640-7?","answer":"Submit an RFQ through the storefront. Availability and current pricing are confirmed at quote time through independent distribution channels."},{"question":"What is 5SY8640-7's listed depth on this component line?","answer":"The 5SY8640-7 has a depth of 76 mm and an installation depth of 70 mm."},{"question":"What compliance documentation does this brand provide for 5SY8640-7?","answer":"The 5SY8640-7 carries IEC 60947-2, UL 1077, and CSA C22.2 No.235 ratings. It is halogen-free and silicon-free, with IP20 protection when conductors are connected. Specific RoHS/REACH declarations are available from the manufacturer upon request."},{"question":"Will 5SY8640-7 drop into a panel specified around 5SY4301-7CV without rewiring?","answer":"Both are 4-pole SENTRON MCBs on a 4 MW DIN-rail footprint, so the mechanical fit is the same. However, the 5SY8640-7 is a 40 A C-curve rated 25 kA IEC, while the 5SY4301-7CV is a different rating — verify the load current and breaking capacity requirements before swapping. The terminal arrangement and busbar compatibility are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8640-7","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/5SY8640-7 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}}