{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5408-7CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5408-7CC","canonicalUrl":"https://aoctrl.com/siemens/5SY5408-7CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5408-7CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY5408-7CC, miniature circuit breaker, 880 V DC, 10 kA, 4-pole, C-curve, 8 A.","salesMarkdown":"## DC-rated MCB for 880 V photovoltaic and industrial circuits The Siemens SENTRON 5SY5408-7CC is a 4-pole miniature circuit breaker rated for 880 V DC with a 10 kA breaking capacity per IEC 60947-2, making it a fit for DC-side protection in photovoltaic arrays, battery banks, and industrial DC bus systems where standard AC-rated MCBs would arc and fail to interrupt. The C-curve trip characteristic means it holds through inrush up to 5–10× rated current — appropriate for capacitive loads like inverter DC links or LED drivers — before tripping magnetically on a hard fault. At 8 A rated current, this breaker protects a single string or branch circuit; the 4-pole design switches both positive and negative conductors simultaneously, which is required by many DC code sections to ensure complete isolation during maintenance. ## What the DC ratings mean for fit AC-only MCBs cannot extinguish a DC arc at these voltages — the arc sustains and welds contacts. The 5SY5408-7CC uses a dedicated DC arc chamber and contact geometry rated for that duty. The maximum DC operating voltage is listed at 1 000 V, giving headroom above the 880 V nominal rating. Mounting position is unrestricted, so it can go sideways or upside-down in a tight enclosure without derating. Height is 90 mm. Neutral conductor is not switched — this is a 4-pole breaker for DC, not a 4-pole AC unit with a switched neutral.","metaTitle":"Siemens 5SY5408-7CC SENTRON MCB, 880 VDC 10 kA, 4P C-Curve 8","metaDescription":"Siemens SENTRON 5SY5408-7CC miniature circuit breaker, 880 VDC, 10 kA breaking capacity per IEC 60947-2, 4-pole, C-curve, 8 A. Active production. Quoted to order.","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":"5SY5408-7CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit-breaker 880 V DC 10kA, 4-pole, C, 8A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at DC rated value":"880 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"II","Combined Terminal Top":"Yes","Design Of The Product":"Machine manufacture / industry","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Consider polarity","Tripping Characteristic Class":"C","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":"DC","at DC according to IEC 60947-2 rated value":"10 kA","operating voltage at DC rated value maximum":"1 000 V","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Extension Installable Supplementary Devices":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9303918fbb65acd8f3b630f6baea3412.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=10726&mlfb=5SY5408-7CC"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5408-7CC","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/5SY5408-7CC 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}}