{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8104-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8104-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8104-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8104-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8104-8, 1-pole miniature circuit breaker, D tripping characteristic, 4 A rated current, 50 kA breaking capacity at 440 V AC per IEC 60947-2.","salesMarkdown":"The Siemens 5SY8104-8 is a 1-pole SENTRON miniature circuit breaker with a D tripping characteristic, rated 4 A at 440 V AC. The 50 kA breaking capacity per IEC 60947-2 tells you it can interrupt a fault current up to that level without welding its contacts or cascading upstream; that's a serious SCCR for a 1-module-wide MCB. ## Fit and integration Snaps onto standard DIN rail, 18 mm per pole (one modular unit). Mount in any position; the quick-assembly system means you can gang it without tools. If you're freezing a BOM, this part is a stable line item.","metaTitle":"Siemens 5SY8104-8 SENTRON MCB, 1P D 4 A, 50 kA IEC","metaDescription":"Siemens 5SY8104-8 SENTRON miniature circuit breaker, 1-pole, D-curve, 4 A, 50 kA breaking capacity per IEC 60947-2. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SY8104-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400 V D=70 mm 25 kA according to EN 60947-2, 1P, D4","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","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":"4 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":"4 A","at 50 °C / rated value":"3.88 A","at 55 °C / rated value":"3.75 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"1","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"50 kA","Product Feature / Touch Protection":"Yes","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","Type Of Voltage / Of The Operating Voltage":"AC","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 Component / 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/7a79d259c173531e34c89dd617beda2d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=41813&mlfb=5SY8104-8"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY8104-8?","answer":"Submit an RFQ — the part is sourced to order, and pricing and stock are confirmed at quote time."},{"question":"What is 5SY8104-8's listed depth?","answer":"76 mm overall depth, with 70 mm installation depth behind the panel face."},{"question":"What compliance documentation does Siemens provide for 5SY8104-8?","answer":"The part carries IEC 60947-2 ratings and UL 1077 / CSA C22.2 No. 235 listings (5 kA at AC). It is halogen-free and silicon-free."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8104-8","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/5SY8104-8 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}}