{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY3040-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY3040-7","canonicalUrl":"https://aoctrl.com/siemens/5SY3040-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY3040-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY3040-7 miniature circuit breaker, 1P+N, C-curve, 40 A, 4.5 kA breaking capacity per EN 60898, 230 V AC, 1 MW wide.","salesMarkdown":"The Siemens 5SY3040-7 is a SENTRON miniature circuit breaker in a 1P+N compact design, rated 40 A with a C tripping characteristic and 4.5 kA breaking capacity per EN 60898 at 230 V AC. It occupies a single width unit (18 mm) on standard DIN rail, with a 76 mm depth that clears most 70 mm deep enclosures. For a domestic or light commercial distribution board with a typical upstream transformer impedance, 4.5 kA is the standard domestic rating — sufficient for most final circuits. The 40 A rating on a 1P+N pole configuration means the neutral is switched alongside the phase, which is required in some regional wiring rules (e.g., UK, Australia) for single-phase final circuits. Snap-on mounting to standard DIN rail (35 mm). The 18 mm width (1 MW) and 76 mm depth fit a standard 70 mm installation depth enclosure. Mounting position is any — horizontal, vertical, or flat — so it can be oriented to suit the panel layout. The top and bottom terminals are not combined (separate line and load connections), which is typical for 1P+N MCBs. Touch protection is provided on the terminals. The neutral conductor is switched internally, so no separate neutral bar connection is needed downstream of the breaker. Vibration resistance tested per IEC 60068-2-6. Energy limiting class 3 means it limits let-through energy effectively for downstream equipment protection. The mechanical service life is 4,000 switching cycles typical.","metaTitle":"Siemens 5SY3040-7 SENTRON MCB, 1P+N, C 40 A, 4.5 kA","metaDescription":"Siemens 5SY3040-7 SENTRON miniature circuit breaker, 1P+N, C-curve 40 A, 4.5 kA per EN 60898, 230 V AC. Current lifecycle stage; sourced to order against RFQ.","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","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","at AC / rated value":"230 V","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"No","Design Of The Product":"Miniature circuit breaker compact","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","Tripping Characteristic Class":"C","acc. to EN 60898 / rated value":"4.5 kA","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","operating current / at AC / rated value":"40 A","vibration resistance / acc. to IEC 60068-2-6":"Yes","with single-phase operation / at AC / maximum":"250 V","Product Function / Neutral Conductor Switching":"Yes","Mechanical Service Life (Switching Cycles) / Typical":"4 000"}},"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=37513&mlfb=5SY3040-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY3040-7/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY3040-7 and how do I get a price?","answer":"We source the 5SY3040-7 through independent distribution and quote it to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the 5SY3040-7's depth?","answer":"The 5SY3040-7 has a depth of 76 mm, with an installation depth of 70 mm, fitting standard enclosures."},{"question":"What is the 5SY3040-7's width?","answer":"The 5SY3040-7 is 18 mm wide (1 width unit), the standard single-module size for DIN-rail MCBs."},{"question":"Will 5SY3040-7 drop into a panel specified around 5SY6002-7KL without rewiring?","answer":"The 5SY3040-7 and 5SY6002-7KL share the same mechanical footprint (18 mm width, 76 mm depth, standard rail mounting, same terminal positions), so it will physically fit the same DIN-rail slot. However, the 5SY6002-7KL is rated 2 A / 6 kA, while the 5SY3040-7 is 40 A / 4.5 kA — the current rating and breaking capacity differ, so the circuit design must be verified before substitution."},{"question":"What compliance documentation does Siemens provide for 5SY3040-7?","answer":"The 5SY3040-7 carries the standard SENTRON compliance: it is rated per EN 60898, tested for vibration per IEC 60068-2-6, and is halogen-free and silicon-free. Specific RoHS, REACH, and UL documentation is available from Siemens on request; we can include it with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY3040-7","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/5SY3040-7 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}}