{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6440-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6440-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SL6440-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6440-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL6440-8CC miniature circuit breaker, 4-pole, D tripping characteristic, 40 A rated current, 6 kA breaking capacity per EN 60898, 400 V AC.","salesMarkdown":"## What this MCB does — and why the D-curve matters The Siemens 5SL6440-8CC is a 4-pole SENTRON miniature circuit breaker with a D tripping characteristic, rated 40 A at 30 °C and 400 V AC. The D-curve means it tolerates inrush currents up to 10–14 times the rated current before tripping magnetically — sized for motor, transformer, or lighting ballast loads that draw a heavy start surge. Rated frequency is 50/60 Hz, so it covers both common line supplies. ## Panel fit and temperature derating The 5SL6440-8CC occupies 4 modular width units (72 mm wide) on a DIN rail, with an installation depth of 70 mm and overall depth of 76 mm. Mounting position is any — no restrictions on orientation inside an enclosure. The 40 A rating holds at 30 °C ambient; at 40 °C it derates to 37.72 A, at 45 °C to 36.53 A, at 50 °C to 35.3 A, and at 55 °C to 34.02 A. Compliance documentation (RoHS, REACH, UL, IEC) is standard for the SENTRON line; the 5SL6440-8CC is rated per EN 60898 for 6 kA breaking capacity and per IEC 60947-2 for industrial applications, though the 6 kA figure is the EN 60898 rating. Vibration resistance is tested to IEC 60068-2-6 at 50 m/s² from 25 to 150 Hz.","metaTitle":"Siemens 5SL6440-8CC SENTRON MCB, 4P D 40 A, 6 kA","metaDescription":"Siemens 5SL6440-8CC SENTRON miniature circuit breaker, 4-pole, D-curve, 40 A, 6 kA breaking capacity per EN 60898, 400 V AC. Active production, sourced 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":"5SL6440-8CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 6kA, 4-pole, D, 40 A Circuit breaker 400 V 6kA, 4-pole, D, 40 A","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","at AC / rated value":"40 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","according to EN 61346-2":"F","at 30 °C / rated value":"40 A","at 40 °C / rated value":"37.72 A","at 45 °C / rated value":"36.53 A","at 50 °C / rated value":"35.3 A","at 55 °C / rated value":"34.02 A","according to IEC 81346-2":"F","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"4","Tripping Characteristic Class":"D","at DC / rated value / maximum":"72 V","according to EN 60898 / rated value":"6 kA","supply voltage / at AC / rated value":"400 V","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","vibration resistance / according to IEC 60068-2-6":"50 m/s² at 25 to 150 Hz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0d39958bdb01b3b38e97409b940d9225.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=230021&mlfb=5SL6440-8CC"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SL6440-8CC?","answer":"The rated breaking capacity is 6 kA per EN 60898 at 400 V AC. That is the standard for residential and light commercial distribution."},{"question":"Will 5SL6440-8CC drop into a panel specified for 5SL4106-7CC?","answer":"Both are 4-pole SENTRON MCBs on a 72 mm (4-module) DIN-rail footprint, so the mechanical fit is identical. The difference is the current rating and curve: 5SL6440-8CC is a 40 A D-curve; the 5SL4106-7CC is a different rating/curve combination. Verify the load requirement before swapping."},{"question":"Where can I buy the 5SL6440-8CC?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6440-8CC","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/5SL6440-8CC 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}}