{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6306-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6306-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SY6306-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6306-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6306-8CC miniature circuit breaker, 3-pole, D-characteristic, 6 A rated, 6 kA breaking capacity per EN 60898, 440 V AC, 50/60 Hz.","salesMarkdown":"## What this MCB is and what the key ratings mean for fit The Siemens 5SY6306-8CC is a SENTRON miniature circuit breaker (MCB) with a D tripping characteristic, rated 6 A at 440 V AC on a 50/60 Hz supply. The D-curve means it tolerates inrush currents 10–20 times the rated current before tripping magnetically — the right choice for motor, transformer, or welding-equipment branch circuits where the start-up surge would nuisance-trip a B- or C-curve breaker. Its breaking capacity is 6 kA per EN 60898, which certifies it for interrupting short-circuit faults up to 6 kA at the rated voltage in a residential or light-industrial distribution board. The 3-pole design (3P) switches all three phases simultaneously, with no neutral pole switching. Thermal derating is documented: the 6 A rating holds at 35 °C ambient, drops to 5.51 A at 40 °C, 5.25 A at 45 °C, 4.97 A at 50 °C, and 4.69 A at 55 °C. If the panel ambient runs above 35 °C, the load current must be reduced accordingly — a common oversight when populating a dense DIN-rail enclosure. ## Mounting and panel integration The 5SY6306-8CC snaps onto a standard DIN rail via its quick-assembly fastening system and occupies 3 modular width units (54 mm). It can be mounted in any position, with an installation depth of 70 mm and an overall depth of 76 mm. The IP20 rating (with connected conductors) is typical for enclosed distribution boards — not for wet or washdown environments. Combined top and bottom terminals accept wiring without requiring separate neutral-link accessories for the load side. The housing is halogen-free and silicon-free, which matters for installations with strict fire-load or contamination specifications (e.g., rail, marine, or clean-room adjacent panels). ## Environmental and compliance data Rated for a surrounding-air temperature range of -40 °C to +75 °C, with humidity limits of 95% at 55 °C, 55% at 70 °C, and 35% at 75 °C. Pollution degree 3 and overvoltage category III per IEC 60664 — suitable for fixed installations where conductive pollution or transient overvoltages from the mains supply are expected.","metaTitle":"Siemens 5SY6306-8CC SENTRON MCB, 6A D-curve, 6kA, 3P","metaDescription":"Siemens 5SY6306-8CC SENTRON miniature circuit breaker, 6A rated, D tripping characteristic, 6kA breaking capacity per EN 60898, 3-pole, 440V AC. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SY6306-8CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 6kA, 3-pole, D, 6A","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":"6 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","according to EN 61346-2":"F","at 35 °C / rated value":"6 A","at 40 °C / rated value":"5.51 A","at 45 °C / rated value":"5.25 A","at 50 °C / rated value":"4.97 A","at 55 °C / rated value":"4.69 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"3","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"6 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","Product Component / Neutral Conductor Switching":"No","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/84b869cac57b5d08c8a81faeef6f98c9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=251535&mlfb=5SY6306-8CC"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY6306-8CC?","answer":"Submit an RFQ through this listing. The part is sourced to order through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the D-curve rating used for on this MCB?","answer":"The D tripping characteristic allows magnetic trips at 10–20 times rated current, making it suitable for motor, transformer, and welding loads with high inrush without nuisance tripping."},{"question":"What is the difference between 5SY6306-8CC and 5SY7210-7CC?","answer":"5SY7210-7CC is a higher-current variant (10 A) in the same SENTRON family, with a C-curve characteristic instead of D-curve. It shares the same 3-pole DIN-rail footprint but is intended for general-purpose distribution rather than high-inrush motor circuits."},{"question":"What compliance documentation does Siemens provide for 5SY6306-8CC?","answer":"The MCB is certified to EN 60898 for breaking capacity and carries IEC 60947-2 overvoltage category III and pollution degree 3 ratings. The halogen-free and silicon-free construction supports RoHS and REACH compliance declarations from the manufacturer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6306-8CC","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/5SY6306-8CC 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}}