{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL5440-7RC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL5440-7RC","canonicalUrl":"https://aoctrl.com/siemens/5SL5440-7RC","factsUrl":"https://aoctrl.com/api/mcp/products/5SL5440-7RC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SL5440-7RC, 4-pole, C characteristic, 40 A, DC rated 880 V, 10 kA breaking capacity.","salesMarkdown":"The Siemens SENTRON 5SL5440-7RC is a 4-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated for 40 A on DC circuits up to 880 V. It carries a 10 kA breaking capacity per the description, sized for DC distribution in residential and infrastructure applications. The C-curve means it trips between 5 and 10 times rated current — suited for moderate inrush loads like lighting banks or small DC motor drives where you need some tolerance for starting current without nuisance trips. ## DC rating and pole configuration Rated for DC operation at 880 V maximum, this 4-pole breaker (4P design) handles series-connected poles to achieve that voltage rating — each pole shares the voltage drop, so the internal arc chambers are sized for the DC interruption duty. DC arcs don't self-extinguish at zero-crossing the way AC arcs do, so the 10 kA DC breaking capacity is a meaningful spec: it tells you the breaker can interrupt a fault current of that magnitude on a DC bus without welding contacts or venting plasma. The 4-module width (72 mm) and 70 mm installation depth fit standard SENTRON distribution boards. ## Environmental and installation constraints Rated for ambient temperatures from -40 °C to 75 °C, with pollution degree 2 and overvoltage category II — typical for fixed indoor installations where transient overvoltages are moderate. IP20 with connected conductors means it's protected against solid objects larger than 12 mm (fingers) but not against moisture; mount it inside a cabinet or enclosure, not in a wet location. Mounting position is unrestricted, which simplifies panel layout. The housing is halogen-free and silicon-free, relevant for environments where outgassing from a fault could contaminate sensitive contacts or optics.","metaTitle":"Siemens 5SL5440-7RC SENTRON MCB, 4P C40, DC 880V","metaDescription":"Siemens SENTRON 5SL5440-7RC miniature circuit breaker, 4-pole C40 characteristic, rated DC 880 V, 10 kA. Current production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","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":"II","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"880 V","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","Type Of Voltage Of The Operating Voltage":"DC","vibration resistance according to IEC 60068-2-6":"no","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"4.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e47dd7c27bae87319bd98eee9eefeb34.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1462293&mlfb=5SL5440-7RC","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL5440-7RC/alternatives.json"},"ai":{"faq":[{"question":"What is the DC voltage rating of the 5SL5440-7RC?","answer":"Rated for DC operation up to 880 V maximum. The 4-pole configuration allows series connection of the poles to achieve this voltage rating."},{"question":"Where can I buy the 5SL5440-7RC?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation is available for the 5SL5440-7RC?","answer":"The breaker carries a halogen-free and silicon-free designation. Standard SENTRON documentation includes CE declaration and manufacturer declarations for RoHS and REACH compliance, though specific certs are not listed in the spec record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL5440-7RC","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/5SL5440-7RC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}