{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5440-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5440-6","canonicalUrl":"https://aoctrl.com/siemens/5SY5440-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5440-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY5440-6, 4-pole miniature circuit breaker, B characteristic, 10 kA per IEC/EN 60898-2, UL 1077, AC/DC rated, universal current.","salesMarkdown":"## What the ratings mean for the panel The Siemens 5SY5440-6 is a 4-pole SENTRON miniature circuit breaker with a B tripping characteristic, rated 10 kA breaking capacity per IEC/EN 60898-2 and also listed under UL 1077. The B-curve means it trips magnetically at 3 to 5 times rated current — designed for resistive and general-purpose loads where inrush isn't severe, like lighting circuits, control transformers, and distribution subfeeds. The 10 kA rating at 400 V AC tells you it can safely interrupt a fault current up to that level without welding contacts or cascading upstream — critical for selectivity studies on a panelboard. It's rated for universal current (AC/DC), so it handles DC circuits up to 880 V per pole, but note the polarity requirement: on DC you must observe polarity as marked, which is a common gotcha on DC breakers that don't have a neutral-switching pole. ## Integration and mounting Snaps onto a DIN rail via the quick-assembly system — 4 modular width units (72 mm wide). Depth is 76 mm, installation depth 70 mm, so it fits standard distribution boards with the cover on. Mounting position any, which simplifies layout in tight enclosures. The combined top and bottom terminals accept both busbar and conductor connections, and the breaker is sealable for anti-tamper requirements. IP20 with connected conductors — fine for enclosed panels, not for washdown areas.","metaTitle":"Siemens 5SY5440-6 SENTRON MCB, 4P, B-Curve, 10 kA IEC/EN 608","metaDescription":"Siemens 5SY5440-6 SENTRON miniature circuit breaker, 4-pole, B tripping characteristic, 10 kA breaking capacity per IEC/EN 60898-2. UL 1077 listed. Active production, sourced to or","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-2, UL1077","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":"400 V","at DC rated value":"880 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"II","Combined Terminal Top":"Yes","Energy Limitation Class":"3","Combined Terminal Bottom":"Yes","Suitability For Operation":"universal current","Neutral Conductor Switching":"No","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"AC as required, observe DC polarity","Tripping Characteristic Class":"B","at DC according to EN 60898-2":"10 kA","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/DC","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":"1 000 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","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":"5 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.6 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2e5b1d8d1f349bdb726f69e75121efa8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=84934&mlfb=5SY5440-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY5440-6/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY5440-6 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here."},{"question":"What is the breaking capacity of 5SY5440-6?","answer":"10 kA per IEC/EN 60898-2 at 400 V AC, and 15 kA per IEC 60947-2 at DC. The UL 1077 listing carries its own rating — check the nameplate for the specific UL interrupting capacity."},{"question":"What compliance documentation does Siemens provide for 5SY5440-6?","answer":"It carries IEC/EN 60898-2 and UL 1077 certifications. The construction is halogen-free and silicon-free. For RoHS, REACH, and specific declaration documents, request them with your RFQ — they are typically available from the manufacturer upon order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5440-6","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/5SY5440-6 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}}