{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4408-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4408-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SY4408-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4408-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4408-8CC miniature circuit breaker, 4-pole, D tripping characteristic, 8 A rated current, 10 kA breaking capacity.","salesMarkdown":"## What this MCB is and what the ratings mean The Siemens 5SY4408-8CC is a 4-pole miniature circuit breaker from the SENTRON 5SY series, designed for DIN-rail mounting in distribution boards and control panels. Its D tripping characteristic means it tolerates the high inrush currents typical of motor loads, transformers, and discharge lighting — the magnetic trip threshold sits at 10–20× rated current, so nuisance tripping on startup is avoided. Rated 8 A at AC and 10 kA breaking capacity per EN 60898, it handles fault currents up to that level without cascading upstream. The 4-pole construction switches all three phases plus neutral; note the neutral is not switched separately — the breaker opens all poles together. ## Temperature derating and installation notes Rated current is temperature-sensitive: at 40 °C ambient the continuous rating drops to 7.52 A, at 50 °C to 7.01 A, and at 55 °C to 6.74 A. If the panel runs hot, factor the derating into the load schedule. The breaker occupies 4 modular width units on a DIN rail, with a quick-assembly fastening system and any mounting position. Installation depth is 70 mm. IP20 with connected conductors — standard for enclosed distribution boards; not rated for washdown. Pollution degree 3 suits industrial environments with conductive dust or condensation.","metaTitle":"Siemens 5SY4408-8CC SENTRON MCB, 4P D-curve 8 A, 10 kA","metaDescription":"Siemens 5SY4408-8CC SENTRON miniature circuit breaker, 4-pole, D tripping characteristic, 8 A rated at AC, 10 kA breaking capacity per EN 60898. Current production. Available to or","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY4408-8CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 4-pole, D, 8A","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","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":"8 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","acc. to DIN EN 61346-2":"F","at 35 °C / rated value":"8 A","at 40 °C / rated value":"7.52 A","at 45 °C / rated value":"7.27 A","at 50 °C / rated value":"7.01 A","at 55 °C / rated value":"6.74 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"D","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","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 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/142584c99df58651bbd732d05cfc7fbd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=35788&mlfb=5SY4408-8CC"},"ai":{"faq":[{"question":"Where can I buy 5SY4408-8CC and how do I get a price?","answer":"The 5SY4408-8CC is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing."},{"question":"Will 5SY4408-8CC drop into a panel specified around 5SY7210-7CC without rewiring?","answer":"Both are 4-pole SENTRON MCBs with the same modular width (4 MUs) and DIN-rail mounting, so physical fit is the same. The key difference is the tripping characteristic: 5SY4408-8CC is D-curve (10–20× In, for motor/transformer loads), while 5SY7210-7CC uses a different curve — check that the protective coordination still matches the downstream load before swapping."},{"question":"What compliance documentation does this brand provide for 5SY4408-8CC?","answer":"The 5SY4408-8CC is certified to IEC/EN 60898 (10 kA breaking capacity) and carries UL 1077 / CSA C22.2 No. 235 recognition (5 kA interrupting rating). The SENTRON series typically includes CE marking and manufacturer declarations for RoHS/REACH compliance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4408-8CC","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/5SY4408-8CC 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}}