{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4303-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4303-8","canonicalUrl":"https://aoctrl.com/siemens/5SL4303-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4303-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4303-8, 3-pole miniature circuit breaker, D tripping characteristic, 3 A rated at 400 V AC, 10 kA breaking capacity per EN 60898 and IEC 60947-2, 3 modular units wide.","salesMarkdown":"## Siemens 5SL4303-8 — SENTRON 3-Pole D-Curve MCB, 3 A, 10 kA The Siemens 5SL4303-8 is a SENTRON miniature circuit breaker (MCB) with three poles, a D tripping characteristic, and a rated current of 3 A at 400 V AC. Its 10 kA breaking capacity is certified under both EN 60898 and IEC 60947-2, meaning it can safely interrupt fault currents up to that level in residential and infrastructure installations. At 30 °C ambient the 5SL4303-8 carries its full 3 A rating. At 40 °C it derates to 2.88 A; at 55 °C to 2.69 A — a consideration for densely packed enclosures where internal temperature rise is significant. The breaker occupies 3 modular width units (54 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. Mounting position is unrestricted, and the IP20 protection class (with connected conductors) is standard for enclosed panel use. ## Mechanical and environmental ratings Rated for 10,000 mechanical operating cycles typical. Ambient temperature range -40 °C to +75 °C, with up to 95% humidity at 55 °C.","metaTitle":"Siemens 5SL4303-8 SENTRON MCB, 3-Pole D-Curve 3A, 10kA","metaDescription":"Siemens 5SL4303-8 SENTRON miniature circuit breaker, 3-pole, D characteristic, 3 A rated, 10 kA breaking capacity per EN 60898. Current lifecycle stage. Quoted to order against RFQ","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SL4303-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, D, 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","acc. to IEC 81346-2":"F","at AC / rated value":"3 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Number Of Poles / Note":"3P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 30 °C / rated value":"3 A","at 40 °C / rated value":"2.88 A","at 45 °C / rated value":"2.82 A","at 55 °C / rated value":"2.69 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"3","Tripping Characteristic Class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","acc. to IEC 60947-2 / rated value":"10 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","Influence Of The Surrounding Temperature":"+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 (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5b69e2d7e81e2f42b38e770e8cc909de.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=162971&mlfb=5SL4303-8"},"ai":{"faq":[{"question":"What is the closest functional alternative to 5SL4303-8?","answer":"The 5SL4363-7 is a peer within the same SENTRON 5SL series, but verify the tripping characteristic and rated current — the 5SL4303-8 is a 3 A D-curve, while the 5SL4363-7 carries a different rating. Panel footprint (3 modular units) and breaking capacity are shared, so it may drop in without rewiring if the ampacity matches the circuit design."},{"question":"Where can I buy 5SL4303-8 and get current pricing?","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 commercial response."},{"question":"What compliance documentation does Siemens provide for 5SL4303-8?","answer":"The 5SL4303-8 carries EN 60898 and IEC 60947-2 breaking capacity certifications. The housing is halogen-free and silicon-free. Standard Siemens declaration of conformity and RoHS/REACH documentation is available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4303-8","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/5SL4303-8 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}}