{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4403-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4403-6","canonicalUrl":"https://aoctrl.com/siemens/5SL4403-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4403-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4403-6 miniature circuit breaker, 4-pole, B-curve, 3 A, 10 kA breaking capacity per EN 60898 and IEC 60947-2, 400 V AC.","salesMarkdown":"## What this breaker is and what it protects The Siemens 5SL4403-6 is a 4-pole miniature circuit breaker from the SENTRON family, rated 3 A with a B tripping characteristic. That B-curve means it trips between 3 and 5 times rated current — so 9 A to 15 A — making it the right choice for resistive or general-purpose loads where you want fast clearing on short circuits but tolerance for small inrush spikes like lighting or control transformers. Breaking capacity is 10 kA per both EN 60898 and IEC 60947-2 at 400 V AC, so it can safely interrupt fault currents up to 10 000 A without welding contacts or cascading failure upstream. That rating is the same under both standards, which simplifies specification across residential and industrial panel builds. Rated for 400 V AC multi-phase operation, maximum 440 V AC, at 50/60 Hz. Depth is 76 mm, installation depth 70 mm, so it sits flush with other SENTRON 5SL series breakers in a row. Halogen-free and silicon-free construction — no corrosive off-gassing if the breaker arcs internally, which matters in sealed or sensitive electronics panels.","metaTitle":"Siemens 5SL4403-6 SENTRON MCB, 4P B 3A 10kA","metaDescription":"Siemens 5SL4403-6 SENTRON miniature circuit breaker, 4-pole, B-curve, 3A, 10kA breaking capacity per EN 60898/IEC 60947-2. Active production, available to order.","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":"5SL4403-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 4-pole, B, 3A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","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":"III","Energy Limitation Class":"3","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"4","Tripping Characteristic Class":"B","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"10 kA","Type Of Voltage Of The Operating Voltage":"AC","with multi-phase operation at AC maximum":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation at AC rated value":"440 V","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9100e56a614e6ff3a5b83a05355de6a8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=59201&mlfb=5SL4403-6"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4403-6","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/5SL4403-6 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}}