{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4308-5","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4308-5","canonicalUrl":"https://aoctrl.com/siemens/5SY4308-5","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4308-5","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4308-5, 3-pole miniature circuit breaker, characteristic A, 10 kA (EN 60898-1) / 20 kA (IEC 60947-2), 400 V AC, 3 modular width units.","salesMarkdown":"## Breaking capacity across standards The 5SY4308-5: For UL 1077 applications, the rating is 5 kA. This means the same breaker can be specified into a panel designed to either residential (EN 60898) or industrial (IEC 60947-2) fault-current levels — a dual-certification that simplifies BOM consolidation when a panel ships to both markets. ## Characteristic A trip curve and deployment Characteristic A (tripping between 2 and 3 times rated current) is the most sensitive standard MCB curve — it catches low-level overcurrents faster than B or C curves. This makes the 5SY4308-5 a fit for protecting semiconductor loads, control transformers, or sensitive electronic circuits where a B-curve's 3–5× threshold would let a fault persist too long. The 3-pole design switches all three phases simultaneously, with no neutral pole. Rated operating voltage is 400 V AC (440 V max for multi-phase or single-phase operation), with a DC rating of 60 V (72 V max). The 50/60 Hz frequency range covers standard mains supplies globally. ## Panel fit and environmental tolerance The quick-assembly fastening system snaps onto the rail without tools. Mounting position is unrestricted — vertical, horizontal, or inverted — which helps when laying out a crowded enclosure.","metaTitle":"Siemens 5SY4308-5 SENTRON 3-Pole MCB, Characteristic A","metaDescription":"Siemens 5SY4308-5 SENTRON 3-pole MCB, characteristic A curve. Rated 10 kA per EN 60898-1, 20 kA 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":"5SY4308-5","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V 10kA, 3-pole, A, 8A, D=70 mm","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","at AC rated value":"400 V","at DC rated value":"60 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"3","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"A","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"20 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","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$234.61","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ebfe7b5e0a9b28c40972addc74de368f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=462845&mlfb=5SY4308-5"},"ai":{"faq":[{"question":"Where can I buy the Siemens 5SY4308-5 and how is it quoted?","answer":"Submit an RFQ with your target quantity and delivery window for a firm quote."},{"question":"Is the Siemens 5SY4308-5 compatible with UL 1077?","answer":"This triple certification allows the same breaker to be used in panels destined for North American and European markets."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4308-5","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/5SY4308-5 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}}