{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8614-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8614-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8614-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8614-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY8614-8, 4-pole (3P+N), D tripping characteristic, rated current 0.3 A at 45 °C, breaking capacity 70 kA at 400 V AC per IEC 60947-2.","salesMarkdown":"At 0.3 A, this is a low-current branch or control-circuit protector, not a main feeder. That's a high-interrupting rating for a 0.3 A frame — it's sized for installations with high available fault current, typically industrial switchboards with large transformers nearby. At DC per IEC 60947-2 it's rated 15 kA, and under UL 1077 / CSA C22.2 No.235 it's 5 kA — so the part carries dual AC/DC ratings but the UL/CSA figure is lower. If the panel requires UL listing, the 5 kA SCCR governs. Current derating is published: 0.3 A at 45 °C, 0.29 A at 50 °C, 0.28 A at 55 °C. In a warm cabinet above 45 °C, the actual continuous current must be reduced accordingly — the 0.3 A label is only valid at the reference temperature. ## Deployment context Mounting position any, installation depth 70 mm. Combined terminal top and bottom — line and load can enter from either side, which simplifies panel wiring when busbars are pre-routed. Neutral conductor switching is built in (3P+N), so the neutral pole opens and closes with the phases. This is required in some national wiring rules (e.g., for TN-S systems) and avoids a floating neutral when the breaker is off.","metaTitle":"Siemens SENTRON 5SY8614-8 MCB, 4P D 0.3A, 70kA IEC","metaDescription":"Siemens SENTRON 5SY8614-8 miniature circuit breaker, 4-pole 3P+N, D-curve 0.3A, 70kA breaking capacity at 400V AC. Active production, sourced to order. Request quote.","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":"5SY8614-8","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, D0.3","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":"400 V","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":"0.3 A","at 50 °C / rated value":"0.29 A","at 55 °C / rated value":"0.28 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":"70 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/63fa2c2102d2c574ba27e21795f97e22.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=388440&mlfb=5SY8614-8"},"ai":{"faq":[{"question":"Does 5SY8614-8 switch the neutral?","answer":"Yes, it is a 3P+N configuration with neutral conductor switching built in — the neutral pole opens and closes with the phases."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8614-8","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/5SY8614-8 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}}