{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4240-7CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4240-7CC","canonicalUrl":"https://aoctrl.com/siemens/5SY4240-7CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4240-7CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4240-7CC miniature circuit breaker, 2-pole, 40 A, C characteristic, 10 kA per EN 60898, 36 mm wide, IP20 with conductors.","salesMarkdown":"## Rated for the panel — 40 A C-curve, 2-pole, 10 kA The Siemens 5SY4240-7CC is a 2-pole miniature circuit breaker from the SENTRON family, rated 40 A at AC with a C tripping characteristic. The 10 kA breaking capacity per EN 60898 means it safely clears faults up to that level without upstream coordination issues — standard for distribution boards feeding motor control centers or general lighting and socket circuits in industrial panels. The C-curve trips between 5 and 10 times rated current, so it handles moderate inrush from small motors or transformers without nuisance tripping, while still protecting the branch wiring. At 36 mm wide (2 modular units), it snaps onto DIN rail via the quick-assembly system and accepts any mounting position. Pollution degree 3 and overvoltage category III suit it for fixed installations inside enclosures where conductive dust or condensation is expected — typical for mining or heavy industrial environments. ## Derating and ambient — what the numbers mean for your panel The 40 A rating holds at 35 °C ambient. At 40 °C it derates to 37.6 A, at 45 °C to 36.36 A, at 50 °C to 35.04 A, and at 55 °C to 33.68 A. If your panel runs hot — say, packed with contactors and drives — plan the branch load against the derated figure at your actual ambient, not the 40 A headline. The breaker is halogen-free and silicon-free, so no corrosive off-gassing inside the enclosure if it clears a fault. Depth is 76 mm (installation depth 70 mm), height 90 mm. The combined top and bottom terminals accept standard copper conductors, and the sealable cover option lets you lock the breaker position after commissioning — useful for mining or process lines where unauthorized resetting is a safety concern.","metaTitle":"Siemens 5SY4240-7CC SENTRON MCB, 40A C-Curve 2-Pole 10kA","metaDescription":"Siemens SENTRON 5SY4240-7CC miniature circuit breaker, 40A rated, C tripping characteristic, 2-pole, 10kA breaking capacity per EN 60898. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY4240-7CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 2-pole, C, 40 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"40 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Energy Limitation Class":"3","according to EN 61346-2":"F","at 35 °C / rated value":"40 A","at 40 °C / rated value":"37.6 A","at 45 °C / rated value":"36.36 A","at 50 °C / rated value":"35.04 A","at 55 °C / rated value":"33.68 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"10 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage / Of The Operating Voltage":"AC","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","Product Component / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","with single-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/2fef982eeb1e677f9a0db2038f321b07.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=137353&mlfb=5SY4240-7CC"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4240-7CC?","answer":"The rated breaking capacity is 10 kA according to EN 60898. This is the maximum fault current the breaker can safely interrupt at its rated voltage."},{"question":"Where can I buy 5SY4240-7CC and what is the lead time?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time; no stock or lead-time figures are listed here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4240-7CC","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/5SY4240-7CC 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}}