{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8306-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8306-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8306-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8306-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8306-8, miniature circuit breaker, 3-pole, D characteristic, 6 A rated current, 50 kA switching capacity at 440 V AC per IEC 60947-2.","salesMarkdown":"The D-curve means the magnetic trip threshold sits at 10 to 20 times the rated current, so it passes the startup surge of a 4 kW motor or a 500 VA control transformer without nuisance tripping, yet still clears a hard fault fast. That 50 kA breaking capacity at 440 V AC (per IEC 60947-2) is the headline number: it tells you this breaker can interrupt a fault up to 50,000 amps without welding its contacts or cascading upstream — essential for a panel fed from a high-capacity transformer or a distribution bus with low source impedance. ## Sizing and derating — the real-world current you can carry The 6 A rating holds at 45 °C ambient. At 50 °C it derates to 5.85 A, and at 55 °C to 5.69 A. The breaker is rated for 50/60 Hz supply and carries a DC breaking capacity of 15 kA at 72 V (per IEC 60947-2), which covers most 24 VDC and 48 VDC control bus applications, though the DC voltage max is 72 V so don't push it onto a 110 VDC battery bank. For UL 1077 / CSA C22.2 No. 235 recognition, the interrupting rating is 5 kA — that's the figure your North American panel shop will look at for supplementary protection. The fastening method is a quick assembly system — push on, clip in, no tools. The terminals are combined (phase and neutral busbar compatible top and bottom), and touch protection is built in. Vibration resistance per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz — fine for mounting on a machine frame or a conveyor drive panel. ## Sourcing — where to get it and what to expect No minimums beyond the quantity you actually need.","metaTitle":"Siemens SENTRON 5SY8306-8 MCB, 6A D-curve, 3-pole, 50 kA","metaDescription":"Siemens SENTRON 5SY8306-8 miniature circuit breaker, 6 A rated current, D tripping characteristic, 3-pole, 50 kA breaking capacity at 400 V AC per IEC 60947-2. Active production, s","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":"5SY8306-8","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, D6","Halogen-Free":"Yes","Silicon-Free":"Yes","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","acc. to IEC 81346-2":"F","at AC / rated value":"6 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","acc. to DIN EN 61346-2":"F","at 45 °C / rated value":"6 A","at 50 °C / rated value":"5.85 A","at 55 °C / rated value":"5.69 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"3","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"50 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":"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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9700de6c83b1312d81f7b36196397f13.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=255489&mlfb=5SY8306-8"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY8306-8?","answer":"Submit an RFQ with the order code 5SY8306-8 and your required quantity. Pricing and availability are confirmed at quote time through independent distribution channels — no minimum order quantity beyond what you need."},{"question":"What is the breaking capacity of 5SY8306-8 at 400 V AC?","answer":"Per IEC 60947-2, the rated breaking capacity is 50 kA at 440 V AC (multi-phase operation). For UL 1077 / CSA C22.2 No. 235, the interrupting rating is 5 kA."},{"question":"Will 5SY8306-8 drop into a panel specified around 5SY7210-7CC without rewiring?","answer":"Both are 3-pole SENTRON MCBs on a standard DIN-rail footprint, so the mechanical fit is the same. The 5SY8306-8 is a 6 A D-curve; the 5SY7210-7CC is a different rating and characteristic. Verify the load current and trip curve match your circuit before swapping — the physical swap is straightforward, but the protection coordination may not carry over."},{"question":"What does the D tripping characteristic mean for motor circuits?","answer":"The D-curve has a magnetic trip threshold of 10 to 20 times the rated current (60 to 120 A for this 6 A breaker). That lets it pass the inrush of small motors, transformers, and solenoid banks without nuisance tripping, while still clearing a hard short circuit fast."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8306-8","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/5SY8306-8 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}}