{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8640-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8640-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8640-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8640-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8640-8, miniature circuit breaker, D tripping characteristic, 40 A, 4-pole (3P+N), 25 kA breaking capacity acc. to IEC 60947-2.","salesMarkdown":"## SENTRON 5SY8640-8 — D-curve MCB, 40 A, 4-pole Rated 40 A at 45 °C, it derates to 38.76 A at 50 °C and 37.48 A at 55 °C, so panel ambient must be considered when loading near the limit. Breaking capacity is 25 kA at AC per IEC 60947-2, 15 kA at DC per IEC 60947-2, and 5 kA at AC per UL 1077 and CSA C22.2 No. 235. Installation depth 70 mm; overall depth 76 mm. Sealable design allows panel lockout for isolation procedures. Operating temperature range -40 to 75 °C, with humidity derating: max 95% RH at 55 °C, 55% at 70 °C, 35% at 75 °C. Vibration resistance per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz. Halogen-free and silicon-free construction. Suitable for mechanical engineering and industry applications per manufacturer designation. Listed under IEC 81346-2 and DIN EN 61346-2 function code F (protective device).","metaTitle":"Siemens 5SY8640-8 SENTRON MCB, D-Curve 40A 4P, 25kA IEC","metaDescription":"Siemens SENTRON 5SY8640-8 miniature circuit breaker, 40 A, 4-pole (3P+N), D tripping characteristic. Breaking capacity 25 kA IEC 60947-2, 15 kA DC, 5 kA UL 1077. Current production","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY8640-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V D=70 mm 25 kA according to EN 60947-2, 3P+N, D40","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":"40 A","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","at 45 °C / rated value":"40 A","at 50 °C / rated value":"38.76 A","at 55 °C / rated value":"37.48 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"25 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","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","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f6f0bd2e651053ed374225d5e5555771.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=33296&mlfb=5SY8640-8"},"ai":{"faq":[{"question":"Where can I buy 5SY8640-8 and get a price?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"Will 5SY8640-8 drop into a panel specified around 5SY6602-8?","answer":"Both are 4-pole SENTRON MCBs with the same 4-module width (72 mm) and DIN-rail mounting, so mechanical fit is identical. The deciding factor is the electrical rating: 5SY8640-8 is a 40 A D-curve; 5SY6602-8 is a different current/curve variant. Verify the BOM rating before swapping."},{"question":"What compliance documentation does Siemens provide for 5SY8640-8?","answer":"The part carries IEC 60947-2, UL 1077, and CSA C22.2 No. 235 ratings. Standard documentation includes the manufacturer's declaration of conformity (CE/UKCA), RoHS and REACH compliance statements, and the product datasheet with IEC breaking capacity and environmental data."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8640-8","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/5SY8640-8 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}}