{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6040-6KL","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6040-6KL","canonicalUrl":"https://aoctrl.com/siemens/5SY6040-6KL","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6040-6KL","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6040-6KL miniature circuit breaker, 1-pole+N, B tripping characteristic, 40 A rated current, 230 V AC, 6 kA breaking capacity per EN 60898, 1 MW width unit, standard rail mount.","salesMarkdown":"The Siemens SENTRON 5SY6040-6KL is a 1-pole+N miniature circuit breaker rated 40 A at 230 V AC, with a B tripping characteristic and 6 kA breaking capacity certified to EN 60898. That B curve means the magnetic trip threshold sits between 3 and 5 times rated current — it clears moderate overloads fast enough for general-purpose resistive and light inductive loads, but won't nuisance-trip on the inrush of a motor branch unless the motor is very small. The 6 kA breaking capacity at 230 V AC covers the typical prospective short-circuit current at the final sub-distribution board in most commercial and residential installations; if your point of supply has a higher fault level, you'll need to verify coordination upstream. Mounts on standard DIN rail (EN 60715) in any orientation — the 18 mm width (1 MW) fits one module slot, and the 70 mm installation depth leaves clearance for a standard enclosure backplate. The neutral pole switches internally (neutral conductor switching is a listed function), so you get a single-width unit that disconnects both L and N in the same housing. IP20 with connected conductors means it's protected against finger contact but not against moisture — keep it inside a panel or enclosure rated for the environment. Terminal capacity accepts up to 16 mm² solid or stranded copper.","metaTitle":"Siemens 5SY6040-6KL SENTRON MCB, 1P+N, B Curve, 40 A, 6 kA","metaDescription":"Siemens 5SY6040-6KL SENTRON miniature circuit breaker, 1P+N, B characteristic, 40 A, 230 V AC, 6 kA breaking capacity per EN 60898. Current production status. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"standard rail","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","at AC / rated value":"230 V","Overvoltage category":"III","Combined Terminal Top":"No","Energy limiting class":"3","Number of width units":"1","Number of poles / Note":"1P+N","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"No","Current / at AC / rated value":"40 A","Tripping characteristic class":"B","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","Product feature / Touch protection":"Yes","Influence of the surrounding temperature":"Periodically +55°C, max. 95% humidity","Vibration resistance / acc. to IEC 60068-2-6":"Yes","with single-phase operation / at AC / maximum":"250 V","Product function / neutral conductor switching":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=305682&mlfb=5SY6040-6KL","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY6040-6KL/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SY6040-6KL?","answer":"The breaking capacity is 6 kA at 230 V AC, certified to EN 60898. That rating governs the maximum fault current the breaker can safely interrupt at the rated voltage."},{"question":"What does the B tripping characteristic mean for this breaker?","answer":"The B characteristic means the magnetic trip operates between 3 and 5 times the rated current (120–200 A for this 40 A unit). It suits resistive and general-purpose loads where inrush is modest; avoid using it on circuits with high starting currents like large motors or transformers."},{"question":"Where can I buy the 5SY6040-6KL?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"Will the 5SY6040-6KL fit in a panel designed for the 5SY6020-7KL?","answer":"Yes — both are 18 mm wide, 76 mm deep, mount on standard DIN rail, and share the same 1P+N form factor. The 5SY6040-6KL is a 40 A B-curve breaker; the 5SY6020-7KL is a 20 A C-curve breaker. No rewiring or panel modification is needed to swap them, provided the circuit rating matches."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6040-6KL","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/5SY6040-6KL 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}}