{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY3040-7KL","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY3040-7KL","canonicalUrl":"https://aoctrl.com/siemens/5SY3040-7KL","factsUrl":"https://aoctrl.com/api/mcp/products/5SY3040-7KL","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY3040-7KL, miniature circuit breaker, 1P+N, 40 A, C characteristic, 4.5 kA per EN 60898, 230 V AC, 1 MW, standard-rail mount.","salesMarkdown":"The Siemens SENTRON 5SY3040-7KL is a 1P+N miniature circuit breaker rated 40 A at 230 V AC, with a C tripping characteristic and a 4.5 kA breaking capacity per EN 60898. The C curve means it tolerates moderate inrush — typical for lighting banks, small motor loads, and general-purpose branch circuits in residential or light commercial panels. The 1P+N pole design switches both phase and neutral, with the neutral pole switching alongside the protected pole; the neutral conductor is not overload-protected but is disconnected when the breaker trips, which matters for circuits where an isolated neutral is required after the protective device opens. Mounting position is unrestricted — horizontal, vertical, or flat — which simplifies layout in a crowded enclosure. Terminal torque range is 17.7 to 22.1 lbf·in; a torque screwdriver set to the middle of that band avoids overtightening the spring cage. The 5SY3040-7KL carries a current-production lifecycle status; it is an active catalog item in the SENTRON family. No last-time-buy or phase-out notice is recorded for this order code. Sourcing is straightforward through independent distribution channels — quoted and confirmed against an RFQ for availability and current pricing.","metaTitle":"Siemens 5SY3040-7KL SENTRON MCB, 1P+N, C40, 4.5 kA","metaDescription":"Siemens SENTRON 5SY3040-7KL miniature circuit breaker, 1P+N, 40 A, C-curve, 4.5 kA per EN 60898, 230 V AC. Current-production part. 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":"22.1 lbf·in","Minimum":"17.7 lbf·in","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":"C","acc. to EN 60898 / rated value":"4.5 kA","Position / of power supply cord":"Any","Product feature / Touch protection":"Yes","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=378045&mlfb=5SY3040-7KL","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY3040-7KL/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY3040-7KL?","answer":"Rated 4.5 kA per EN 60898 at 230 V AC. That is the interrupting rating for the standard it is certified to — sufficient for most residential and light commercial sub-distribution boards where the prospective fault current stays under that level."},{"question":"Will 5SY3040-7KL drop into a panel specified around the 5SY6006-7?","answer":"Physically yes — same 18 mm width, same 76 mm depth, same DIN-rail mount. The 5SY6006-7 is a 6 A C-curve unit with a 6 kA breaking capacity; the 5SY3040-7KL is a 40 A unit with a 4.5 kA rating. The mechanical footprint is identical, so no rewiring or busbar repositioning is needed if the ampacity and interrupting rating are acceptable for the circuit."},{"question":"Where can I buy 5SY3040-7KL and what is the price?","answer":"Sourced to order against an RFQ through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time — no stock figures or price lists are published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY3040-7KL","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/5SY3040-7KL 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}}