{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6403-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6403-7","canonicalUrl":"https://aoctrl.com/siemens/5SY6403-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6403-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6403-7, 4-pole miniature circuit breaker, C-curve, 3 A rated, 6 kA (EN 60898) / 30 kA (IEC 60947-2), 72 mm width, IP20 with conductors.","salesMarkdown":"## Integrator note — 5SY6403-7 The Siemens 5SY6403-7 is a 4-pole miniature circuit breaker from the SENTRON family, rated 3 A with a C tripping characteristic. It occupies 4 modular width units (72 mm) on a DIN rail, mounts in any position, and is current production — no lifecycle concern for new builds. Breaking capacity is 6 kA per EN 60898 and 30 kA per IEC 60947-2, so it handles fault currents up to 30 kA in an industrial panel — enough for most downstream sub-distribution boards. The C-curve (5–10× In) suits moderate inrush loads like small motor starters or lighting banks. Temperature derating is specified: 3 A at 35 °C, 2.86 A at 40 °C, 2.78 A at 45 °C, 2.71 A at 50 °C, 2.62 A at 55 °C. If the panel ambient runs above 35 °C, the effective continuous current drops — factor that into the load schedule. Pollution degree 3 and overvoltage category III mean it's rated for fixed industrial installations where conductive contamination is possible. The housing is halogen-free and silicon-free, which matters for clean-room or sensitive electronics environments. ## Panel fit & mounting Width is 72 mm (4 module spaces), depth 76 mm, installation depth 70 mm. The quick-assembly system means it clips onto a standard 35 mm DIN rail without tools. Combined terminals top and bottom accept conductors up to the usual MCB range; touch protection is built in. IP20 with connected conductors — fine for enclosed panels; not for wet or outdoor exposure without a sealed enclosure.","metaTitle":"Siemens 5SY6403-7 SENTRON MCB, 4P C 3A, 6kA/30kA, 72mm wide","metaDescription":"Siemens 5SY6403-7 SENTRON miniature circuit breaker, 4-pole, C-curve, 3 A rated, 6 kA (EN 60898) / 30 kA (IEC 60947-2). Current production. Quoted to order against RFQ.","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":"5SY6403-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 6kA, 4-pole, C, 3 A, D=70 mm","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":"3 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"4P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 35 °C / rated value":"3 A","at 40 °C / rated value":"2.86 A","at 45 °C / rated value":"2.78 A","at 50 °C / rated value":"2.71 A","at 55 °C / rated value":"2.62 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","acc. to EN 60898 / rated value":"6 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"30 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":"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 (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b187f1603aa93daabfd64d025f96d5dc.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=418791&mlfb=5SY6403-7"},"ai":{"faq":[{"question":"What is 5SY6403-7's width and depth?","answer":"Width is 72 mm (4 modular units), depth is 76 mm, and installation depth is 70 mm."},{"question":"What is the breaking capacity of 5SY6403-7?","answer":"6 kA per EN 60898 and 30 kA per IEC 60947-2."},{"question":"Where can I buy 5SY6403-7 and how is it quoted?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6403-7","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/5SY6403-7 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}}