{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6303-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6303-7","canonicalUrl":"https://aoctrl.com/siemens/5SJ6303-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6303-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ6 series, 5SJ6303-7 miniature circuit breaker, 3-pole, C-curve, 3 A, 6 kA, 400 V AC.","salesMarkdown":"The Siemens 5SJ6303-7 is a SENTRON 5SJ6 miniature circuit breaker, 3-pole, C-curve, rated 3 A at 400 V AC. The C-curve trips between 5 and 10 times rated current — 15 to 30 A — so it handles moderate inrush from motor starters or transformer banks without nuisance trips, while still clearing a hard fault. The 6 kA breaking capacity (per EN 60898 and IEC 60947-2) means it can safely interrupt a fault current up to 6 kA at the panel; if the available fault current at the installation point exceeds that, you need an upstream current-limiting device or a higher-rated breaker. The 3 A rating suits small motor circuits, control transformers, or lighting sub-circuits where the load draws under 3 A continuous. Terminals accept solid or stranded conductors from 0.75 to 25 mm² — enough for the 3 A load wiring plus any daisy-chained feed-through. Mounts in any position on a DIN rail; installation depth is 70 mm, and the 3-pole body occupies 3 width units (roughly 54 mm). Ambient operating range is -20 to +45 °C, with storage from -40 to +75 °C. Vibration resistance tested to 50 m/s² at 25 to 150 Hz and 60 m/s² at 10 to 150 Hz per IEC 60068-2-6 — suitable for installation on machinery or in mobile equipment where shock and vibration are present.","metaTitle":"Siemens 5SJ6303-7 SENTRON MCB, 3-Pole C 3A 6kA 400V","metaDescription":"Siemens 5SJ6303-7 SENTRON miniature circuit breaker, 3-pole, C-curve, 3 A rated, 6 kA breaking capacity per EN 60898/IEC 60947-2, 400 V AC. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Solid":"0.75 ... 25 mm²","Sealable":"Yes","Stranded":"0.75 ... 25 mm²","Rated Value":"50 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Wertebereich":"-20 ... +45 °C","Number of poles":"3","Type of voltage":"AC/DC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-40 ... +75 °C","Product designation":"Miniature circuit breakers","Protection class IP":"IP20, with connected conductors","Overvoltage category":"3","Design of the product":"Miniature circuit breaker 5SJ6","Energy limiting class":"3","Number of width units":"3","Number of poles / Note":"3","circuit-breaker / Design":"5SJ6","Current / at AC / rated value":"3 A","Tripping characteristic class":"C","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"6 kA","Product feature / Touch protection":"Yes","Supply voltage / at AC / rated value":"400 V","Influence of the surrounding temperature":"Periodically +55°C, max. 95% humidity","Vibration resistance / acc. to IEC 60068-2-6":"50m/s² at 25 to 150Hz and 60m/s² at 10 to 150 Hz","with multi-phase operation / at AC / maximum":"440 V","Mechanical service life (switching cycles) / typical":"20 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=7775&mlfb=5SJ6303-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ6303-7/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SJ6303-7?","answer":"6 kA per EN 60898 and IEC 60947-2 at 400 V AC."},{"question":"What wire sizes does 5SJ6303-7 accept?","answer":"Solid or stranded conductors from 0.75 to 25 mm²."},{"question":"Where can I buy 5SJ6303-7?","answer":"Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6303-7","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/5SJ6303-7 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}