{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4308-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4308-7","canonicalUrl":"https://aoctrl.com/siemens/5SL4308-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4308-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4308-7, miniature circuit breaker, 3-pole, C-curve, 8 A, 400 V AC, 10 kA, 3 MW units.","salesMarkdown":"## What this MCB is and what it does The Siemens SENTRON 5SL4308-7 is a 3-pole miniature circuit breaker (MCB) with a C-trip curve, rated 8 A at 400 V AC and a 10 kA breaking capacity per EN 60898. The C-curve means it trips between 5 and 10 times rated current — suited for mixed resistive and moderate inductive loads like lighting circuits, small motor starters, and general-purpose distribution in residential and light commercial panels. ## Key ratings and what they mean for fit Rated 8 A at 30 °C ambient; at 40 °C the continuous current derates to 7.39 A, at 45 °C to 7.04 A, and at 55 °C to 6.37 A. If the panel runs warm, size the branch circuit for the derated value — the 8 A label is only valid at the 30 °C reference. Breaking capacity is 10 kA per both EN 60898 and IEC 60947-2 — that's the fault current this MCB can safely interrupt without welding contacts or rupturing the case. For installations where the prospective short-circuit current exceeds 10 kA, step up to a higher-rated device or add a current-limiting upstream fuse. Rated insulation voltage is 440 V AC for multi-phase operation; the supply frequency is 50/60 Hz. Overvoltage category III and pollution degree 2 cover fixed-installation distribution boards — typical for main or sub-distribution panels. Mechanical service life is 10 000 switching cycles — adequate for normal overcurrent protection duty but not intended for frequent manual switching as a load-break device. ## Mounting and integration Occupies 3 modular width units (54 mm) on a DIN rail. Depth is 76 mm, installation depth 70 mm. Mounting position is unrestricted — horizontal, vertical, or any angle works. IP20 with connected conductors — protected against finger contact but not against water ingress, so it's for indoor enclosures only. Sealable design allows the installer to lock the toggle position with a padlock — useful for lockout/tagout on dedicated circuits. Halogen-free and silicon-free construction reduces toxic smoke and corrosive byproducts in case of arc fault inside the panel.","metaTitle":"5SL4308-7 SENTRON MCB, 3P C 8A, 10kA, 400V","metaDescription":"Siemens SENTRON 5SL4308-7 miniature circuit breaker, 3-pole, C-curve, 8A rated at 400V AC, 10kA breaking capacity per EN 60898. Current production, sourced to order.","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":"5SL4308-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, C, 8A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","at AC / rated value":"8 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Energy Limitation Class":"3","according to EN 61346-2":"F","at 30 °C / rated value":"8 A","at 40 °C / rated value":"7.39 A","at 45 °C / rated value":"7.04 A","at 55 °C / rated value":"6.37 A","according to IEC 81346-2":"F","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"3","Tripping Characteristic Class":"C","at DC / rated value / maximum":"72 V","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","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 (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$94.16 – $98.08","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=303670&mlfb=5SL4308-7"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL4308-7?","answer":"10 kA per EN 60898 and IEC 60947-2 at 400 V AC."},{"question":"What documentation does Siemens provide for compliance?","answer":"The product is halogen-free and silicon-free, rated for overvoltage category III and pollution degree 2. The manufacturer typically supplies RoHS, REACH, and IEC/EN test reports with the shipment; request them with the RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4308-7","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/5SL4308-7 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}}