{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8320-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8320-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8320-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8320-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 3-pole, D-tripping characteristic, 20 A rated current, 30 kA interrupting capacity per IEC 60947-2, order code 5SY8320-8.","salesMarkdown":"The Siemens SENTRON 5SY8320-8 is a 3-pole miniature circuit breaker with a D tripping curve, rated 20 A at 440 V AC and capable of interrupting 30 kA under IEC 60947-2. That 30 kA SCCR figure — not the 10 kA common on residential MCBs — tells you it can be used at the service entrance of an industrial panel where fault current runs high, without needing a current-limiting upstream breaker to protect it. The 3-pole design switches all three phases; neutral is not switched. Operating frequency is 50/60 Hz, so it fits standard line supplies worldwide. At 45 °C ambient the breaker holds its full 20 A rating. At 50 °C it derates to 19.5 A; at 55 °C it drops to 18.98 A. The permissible operating range spans −40 °C to 75 °C, with humidity limits scaling from 95 % at 55 °C down to 35 % at 75 °C. For a panel builder that means if the breaker lives next to a heat source, you must account for the reduced current-carrying capacity — especially in a sealed enclosure. Mounting position is any orientation. Halogen-free and silicon-free construction matters in environments where outgassing can contaminate contacts or optics — food processing lines, medical device manufacturing, or semiconductor cleanrooms. The breaker is also sealable, allowing the panel to be locked against unauthorized operation after commissioning.","metaTitle":"Siemens SENTRON 5SY8320-8 MCB, 3P D 20 A, 30 kA","metaDescription":"Siemens SENTRON 5SY8320-8 miniature circuit breaker, 3-pole, D-curve, 20 A, 30 kA interrupting capacity per IEC 60947-2. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SY8320-8","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, D20","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","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","at AC / rated value":"20 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","according to EN 61346-2":"F","at 45 °C / rated value":"20 A","at 50 °C / rated value":"19.5 A","at 55 °C / rated value":"18.98 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"3","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","according to IEC 60947-2 / rated value":"30 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","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","at DC / according to IEC 60947-2 / rated value":"15 kA","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9e8034081b32c8acae163ac0f4e60ac5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=410564&mlfb=5SY8320-8"},"ai":{"faq":[{"question":"What is the interrupting capacity of 5SY8320-8?","answer":"30 kA per IEC 60947-2 at AC, and 15 kA at DC up to 72 V. That 30 kA figure is the rated ultimate short-circuit breaking capacity (Icu) — high enough for most industrial service-entrance or sub-distribution panels."},{"question":"How do I get current pricing and availability for 5SY8320-8?","answer":"Submit an RFQ through this listing. The part is sourced to order via independent distribution; price and stock are confirmed at quote time, not listed here."},{"question":"Will 5SY8320-8 drop into a panel specified around 5SY7210-7CC without rewiring?","answer":"Both are 3-pole SENTRON MCBs on the same DIN-rail footprint (3 MW, 54 mm width), so the mechanical fit is identical. The functional difference is the tripping curve: 5SY8320-8 is D-curve (10–20× In), while the peer is a different characteristic. Verify the curve matches your load type before swapping — a D-curve on a purely resistive load will still protect, but a C-curve may nuisance-trip on a motor start."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8320-8","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/5SY8320-8 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}}