{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6440-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6440-6","canonicalUrl":"https://aoctrl.com/siemens/5SL6440-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6440-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL6 series, miniature circuit breaker, 4-pole, B-curve, 40 A, 6 kA, 400 V AC.","salesMarkdown":"## Siemens 5SL6440-6 SENTRON MCB — 40 A, 4-Pole, B-Curve, 6 kA The Siemens 5SL6440-6 is a SENTRON miniature circuit breaker rated 40 A at 400 V AC with a B tripping characteristic and a 6 kA breaking capacity certified to both EN 60898 and IEC 60947-2. Four poles (4P) with no switched neutral — it opens all phase conductors on a fault, which is the standard arrangement for a 3-phase + N incomer where the neutral is solidly connected. The B-curve (3–5× In instantaneous trip) suits resistive and general lighting loads in residential and light commercial infrastructure panels where inrush is low. At 6 kA SCCR it coordinates with downstream distribution boards that have a lower fault level; upstream a larger MCCB or fuse must limit the prospective fault current to this value. Snap-on mounting to DIN rail (EN 60715) in any orientation. Mechanical service life of 10 000 switching cycles typical; this is a protective device, not a daily-switched disconnect — the figure governs the handle mechanism, not the contacts under load. The 5SL6440-6 at 6 kA is the standard residential/infrastructure variant; the 10 kA sibling is specified where the utility transformer or service entrance delivers higher prospective fault current. Footprint and DIN-rail mounting are identical, so a panel specified around the 5SL6606-7YA can accept the 5SL6440-6 without rewiring, provided the fault level at the installation point does not exceed 6 kA. ## Environmental range and approvals Overvoltage category III (distribution board level) per IEC 60664. Energy limiting class 3 — the breaker limits let-through energy on a fault, reducing stress on downstream conductors and equipment. Approvals include EN 60898 (household-type MCB) and IEC 60947-2 (industrial circuit-breaker standard), giving dual certification for both residential and light industrial panels. Touch protection per the product feature ensures live busbar contacts are shielded when the breaker is installed in a distribution board.","metaTitle":"Siemens 5SL6440-6 SENTRON MCB, 4P B 40 A 6 kA","metaDescription":"Siemens 5SL6440-6 SENTRON miniature circuit breaker, 4-pole, B-curve, 40 A, 6 kA breaking capacity per EN 60898/IEC 60947-2. Active production. Quoted 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":"5SL6440-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50 Hz","description":"Miniature circuit breaker 400 V 6kA, 4-pole, B, 40 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Number of poles":"4","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","Overvoltage category":"3","Design of the product":"5SL miniature circuit breakers","Energy limiting class":"3","Number of width units":"4","Number of poles / Note":"4P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SL6","Suitability for operation":"Residential buildings/infrastructure","Current / at AC / rated value":"40 A","Tripping characteristic class":"B","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"6 kA","acc. to IEC 60947-2 / rated value":"6 kA","Product feature / Touch protection":"Yes","Supply voltage / at AC / rated value":"400 V","Influence of the surrounding temperature":"Periodically +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 (switching cycles) / typical":"10 000"}},"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=527426&mlfb=5SL6440-6"},"ai":{"faq":[{"question":"What is the closest functional second-source for 5SL6440-6?","answer":"The 5SL6606-7YA is the closest functional peer — same 4-pole B-curve 40 A rating but with a 10 kA breaking capacity instead of 6 kA. The 5SL6440-6 drops into the same DIN-rail footprint without rewiring, provided the installation's prospective fault current does not exceed 6 kA."},{"question":"Where can I buy 5SL6440-6?","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 5SL6440-6?","answer":"The breaker carries dual certification to EN 60898 and IEC 60947-2. It is halogen-free and silicon-free. Standard Siemens declaration of conformity and CE marking apply."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6440-6","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/5SL6440-6 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}}