{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8604-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8604-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8604-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8604-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8604-8, 4-pole miniature circuit breaker, D tripping characteristic, 50 kA at 400 V AC, 4 A rated current, 4 MW width.","salesMarkdown":"The Siemens 5SY8604-8 is a 4-pole (3P+N) miniature circuit breaker from the SENTRON series, with a D tripping characteristic rated at 4 A and a 50 kA breaking capacity at 400 V AC per IEC 60947-2. That D curve means it handles high inrush currents — think motor starts, transformer energization, or industrial lighting banks — without nuisance tripping on the magnetizing spike, while still clearing a hard fault at 50 kA. ## Ratings that matter for the panel Under UL 1077 and CSA C22.2 No. 235, the interrupting rating is 5 kA, so if the panel is built to North American supplementary-protector rules, that's the figure to use for coordination. At DC per IEC 60947-2, it's rated 15 kA. The D characteristic means the magnetic trip fires at 10 to 20 times In (40 to 80 A for this 4 A unit). That's the right choice for loads with a high starting surge — a small motor, a solenoid bank, or a control transformer. The thermal element handles overloads on a slower curve, so a momentary inrush won't drop the load. Temperature derating is published: 4 A at 45 °C, 3.9 A at 50 °C, 3.8 A at 55 °C. If the panel runs hot, factor that in. ## Integration notes The combined terminal at top and bottom accepts both busbar and conductor, which speeds up daisy-chaining in a multi-pole distribution block. Touch protection is provided with connected conductors, and the unit is sealable for tamper-proofing after commissioning.","metaTitle":"Siemens 5SY8604-8 SENTRON MCB, 4P D-curve, 50 kA at 400 V","metaDescription":"Siemens 5SY8604-8 SENTRON miniature circuit breaker, 4-pole D characteristic, 50 kA breaking capacity at 400 V AC. Current-production, sourced to order. Request a 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":"5SY8604-8","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, D4","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":"4 A","at 50 °C / rated value":"3.9 A","at 55 °C / rated value":"3.8 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":"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":"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/d66aa671e7a3f0638b47213a56471945.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=254463&mlfb=5SY8604-8"},"ai":{"faq":[{"question":"Where can I buy 5SY8604-8 and get a price?","answer":"The 5SY8604-8 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit a request for a firm quote."},{"question":"What is the difference between 5SY8604-8 and 5SY6602-8?","answer":"The 5SY6602-8 is a 2-pole B-curve MCB rated at 2 A with a lower breaking capacity — it's a different animal entirely. The 5SY8604-8 is a 4-pole D-curve at 4 A with 50 kA breaking capacity. They are not drop-in replacements; the pole count, curve, and interrupting rating are all mismatched. If you need a D-curve 4-pole at 4 A, the 5SY8604-8 is the correct part."},{"question":"What compliance documentation does Siemens provide for 5SY8604-8?","answer":"The 5SY8604-8 carries IEC 60947-2 ratings, UL 1077 and CSA C22.2 No. 235 supplementary-protector listings, and is halogen-free and silicon-free. Standard Siemens documentation includes the declaration of conformity (CE/UKCA), RoHS and REACH compliance statements, and the product datasheet with characteristic curves."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8604-8","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/5SY8604-8 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}}