{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4240-6CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4240-6CC","canonicalUrl":"https://aoctrl.com/siemens/5SY4240-6CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4240-6CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4240-6CC, 2-pole miniature circuit breaker, B tripping characteristic, 40 A rated current (at 35 °C), 10 kA breaking capacity per EN 60898, 440 V AC, 2 MWU.","salesMarkdown":"The Siemens 5SY4240-6CC is a SENTRON miniature circuit breaker (MCB) — a 2-pole, B-curve unit rated 40 A at 35 °C, with a 10 kA breaking capacity tested to EN 60898. It's designed for final-subcircuit protection in distribution boards, protecting wiring and loads against overloads and short circuits. The B-curve characteristic means the magnetic trip operates at 3 to 5 times In (120–200 A for this 40 A unit), so it's a good fit for resistive and general-purpose loads — lighting, heating, control transformers — where inrush isn't severe. The 440 V AC rating (single- or multi-phase) covers common 400 V three-phase systems. The temperature derating curve is worth noting: it holds a full 40 A at 35 °C, drops to 37.6 A at 40 °C, and continues down to 33.68 A at 55 °C — so if your panel runs hot, you need to account for that when sizing the branch circuit.","metaTitle":"Siemens 5SY4240-6CC SENTRON MCB, B Curve, 40 A, 2-Pole","metaDescription":"Siemens 5SY4240-6CC SENTRON miniature circuit breaker, 2-pole, B characteristic, 40 A rated at 35 °C, 10 kA breaking capacity per EN 60898. Active production, available 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":"5SY4240-6CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 2-pole, B, 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","at AC rated value":"40 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","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","Energy Limitation Class":"3","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"2","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"B","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","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d9fa54c62eb056a4fb54759f2a7c1184.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=422753&mlfb=5SY4240-6CC"},"ai":{"faq":[{"question":"Where can I buy 5SY4240-6CC and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What's the closest functional alternative to 5SY4240-6CC?","answer":"A peer like 5SY7206-7CC shares the same SENTRON platform and 2-pole form factor, but its rating and curve differ — verify the specific B-curve 40 A requirement before substituting. No direct drop-in replacement is listed as an official successor."},{"question":"What is the depth of 5SY4240-6CC?","answer":"The overall depth is 76 mm; the installation depth behind the panel face is 70 mm."},{"question":"What is the width of 5SY4240-6CC?","answer":"The width is 36 mm, which corresponds to 2 modular width units on a standard DIN-rail distribution board."},{"question":"Will 5SY4240-6CC drop into a panel specified around 5SY7206-7CC?","answer":"Both are 2-pole SENTRON MCBs on the same DIN-rail footprint, so the mechanical fit is the same. However, the ratings and tripping characteristics differ — confirm the B-curve and 40 A rating match your branch-circuit protection requirements before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4240-6CC","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/5SY4240-6CC 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}}