{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7440-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7440-7","canonicalUrl":"https://aoctrl.com/siemens/5SY7440-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7440-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7440-7 miniature circuit breaker, 4-pole, C-curve, 40 A rated at AC, breaking capacity 15 kA (EN 60898) / 20 kA (IEC 60947-2), 4 MW units, IP20.","salesMarkdown":"## What this 4-pole C-curve 40 A MCB does on the rail At DC (IEC 60947-2) it's rated 15 kA. Rated current holds at 40 A up to 35 °C ambient. Above that it derates: 38.4 A at 40 °C, 37.6 A at 45 °C, 36.76 A at 50 °C, 35.92 A at 55 °C, and 35.04 A at 60 °C. The surrounding temperature influence curve caps at 95 % RH up to 55 °C, then drops to 55 % RH at 70 °C and 35 % RH at 75 °C. ## Compliance and environmental specs Halogen-free and silicon-free construction, sealable, with a degree of pollution 3 rating and overvoltage category III. Suitability listed for mechanical engineering and industry applications. Energy limitation class 3; neutral conductor is not switched. Combined terminal top and bottom are present.","metaTitle":"Siemens 5SY7440-7 SENTRON MCB, 4P C-curve 40 A, 15/20 kA","metaDescription":"Siemens 5SY7440-7 SENTRON miniature circuit breaker, 4-pole, C-curve, 40 A rated at AC. Breaking capacity 15 kA (EN 60898) / 20 kA (IEC 60947-2). Current lifecycle. Sourced to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY7440-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 15kA, 4-pole, C, 40A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","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":"38.4 A","at 45 °C rated value":"37.6 A","at 50 °C rated value":"36.76 A","at 55 °C rated value":"35.92 A","at 60 °C rated value":"35.04 A","Energy Limitation Class":"3","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"C","according to EN 60898 rated value":"15 kA","according to IEC 60947-2 rated value":"20 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","at DC according to IEC 60947-2 rated value":"15 kA","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","supply voltage with single-phase operation at AC rated value":"230 V","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/90c5a2ada1dd1c9f5c12e3afb24fc347.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=248609&mlfb=5SY7440-7"},"ai":{"faq":[{"question":"Where can I buy 5SY7440-7 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing."},{"question":"Will 5SY7440-7 drop into a panel that was specified around 5SY4140-7 without rewiring?","answer":"Both are 4-pole SENTRON MCBs in the same 4 MW footprint (72 mm wide), so the mechanical fit is identical. The 5SY7440-7 is a 40 A C-curve; the 5SY4140-7 is a different rating — verify the load current and trip characteristic before swapping."},{"question":"What compliance documentation does Siemens provide for 5SY7440-7?","answer":"The breaker is halogen-free and silicon-free. It carries ratings per EN 60898 and IEC 60947-2, and is designed for overvoltage category III and pollution degree 3 environments."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7440-7","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/5SY7440-7 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}}