{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL3303-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL3303-7","canonicalUrl":"https://aoctrl.com/siemens/5SL3303-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SL3303-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL miniature circuit breaker, 5SL3303-7, 3-pole, C-curve, 3 A rated current, 4.5 kA breaking capacity at 400 V AC, 3 module widths.","salesMarkdown":"The Siemens 5SL3303-7 is a SENTRON 5SL miniature circuit breaker (MCB) — a 3-pole unit with a C-curve tripping characteristic, rated 3 A at 400 V AC. In a panel with elevated internal temperature, derate per the manufacturer's curve — the surrounding temperature spec allows periodic +55 °C at 95 % humidity, so the breaker is built for warm enclosures, but the trip threshold shifts. The 4.5 kA SCCR at 400 V AC means it safely interrupts faults up to that level without welding or cascading upstream — coordination with a higher-rated upstream device is required if the prospective fault current exceeds 4.5 kA. The 3-pole design switches all three phases simultaneously, which is critical for three-phase loads where a single-phase trip could backfeed and create a shock hazard. Rated voltage is 400 V AC for multi-phase operation, with a maximum of 440 V AC. The DC rating is 72 V maximum — this is not a DC-rated breaker for solar or battery strings above that voltage. The energy limiting class is 3, meaning it limits let-through energy well, reducing arc-flash risk downstream. Snap-on DIN rail mount, 3 module widths (54 mm). Sealable with a lockable cover or clip, which matters for LOTO compliance on a circuit that must be positively isolated. Halogen-free and silicon-free construction for environments sensitive to outgassing (clean rooms, medical, data centers).","metaTitle":"Siemens 5SL3303-7 SENTRON MCB, 3-pole C-curve 3 A 4.5 kA","metaDescription":"Siemens 5SL3303-7 SENTRON miniature circuit breaker, 3-pole, C-curve, 3 A rated, 4.5 kA breaking capacity per EN 60898. Active production. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SL3303-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50 Hz","description":"Miniature circuit breaker 400 V 4.5 kA, 3-pole, C, 3A","Halogen-Free":"Yes","Silicon-Free":"Yes","Number of poles":"3","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","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":"3","Design of the product":"5SL miniature circuit breakers","Energy limiting class":"3","Number of width units":"3","Number of poles / Note":"3P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SL3","Suitability for operation":"Residential buildings/infrastructure","Current / at AC / rated value":"3 A","Tripping characteristic class":"C","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"4.5 kA","acc. to IEC 60947-2 / rated value":"4.5 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","with multi-phase operation / at AC / maximum":"440 V","Product function / neutral conductor switching":"No","with multi-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/ba6b045541d906b2b8b1e79bc2e9dbac.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=87259&mlfb=5SL3303-7"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SL3303-7?","answer":"4.5 kA per EN 60898 and IEC 60947-2 at 400 V AC. That is the standard rating for residential and light commercial distribution boards. If your prospective fault current exceeds 4.5 kA, coordinate with an upstream current-limiting device."},{"question":"Will 5SL3303-7 drop into a panel specified around 5SL3640-7MB without rewiring?","answer":"Both are 3-pole SENTRON 5SL MCBs on the same DIN-rail footprint (3 module widths, 54 mm). The 5SL3303-7 is 3 A C-curve; the 5SL3640-7MB is a higher-current variant. No rewiring needed — the bus-bar pitch and terminal layout are identical. Just verify the ampacity and coordination."},{"question":"Where can I buy 5SL3303-7?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time. Submit an RFQ for a firm price and delivery window."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL3303-7","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/5SL3303-7 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}}