{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7402-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7402-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7402-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7402-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7402-8, 4-pole miniature circuit breaker, D tripping characteristic, 2 A rated at 35 °C, 15 kA (EN 60898) / 50 kA (IEC 60947-2), 4 modular width units.","salesMarkdown":"## What it is and what the ratings mean The Siemens SENTRON 5SY7402-8 is a 4-pole miniature circuit breaker with a D tripping characteristic, rated 2 A at 35 °C. The D curve means it tolerates inrush currents 10–20 times the rated current — designed for motor and transformer branch circuits where the starting surge would nuisance-trip a B or C curve. Breaking capacity is 15 kA per EN 60898 and 50 kA per IEC 60947-2, so it clears faults up to that level without cascading upstream. The 4-pole (4P) configuration switches all three phases plus neutral, common in three-phase panelboards where neutral isolation is required. ## Deployment context and integration Mounts in any position on a DIN rail via the quick-assembly system. At 4 modular width units (72 mm wide), it occupies standard panel space. Combined terminals top and bottom accept conductors; IP20 with connected conductors means it's protected against finger contact once wired. Pollution degree 3 and overvoltage category III suit it for industrial control panels and distribution boards where conductive dust and transient overvoltages are present. Rated for 50/60 Hz supply. ## Thermal derating and ambient limits The 2 A rating holds at 35 °C. Above that, derate linearly: 1.9 A at 40 °C, 1.85 A at 45 °C, 1.8 A at 50 °C, 1.75 A at 55 °C, and 1.7 A at 60 °C. Operating ambient range is -40 °C to 75 °C. Humidity derating applies: max 95% RH up to 55 °C, then 55% RH up to 70 °C, then 35% RH up to 75 °C. If the panel runs hot, size the load accordingly.","metaTitle":"Siemens 5SY7402-8 SENTRON MCB, 4P D-curve 2 A, 15 kA","metaDescription":"Siemens 5SY7402-8 SENTRON miniature circuit breaker, 4-pole, D tripping characteristic, 2 A rated at 35 °C, 15 kA breaking capacity per EN 60898. Active production. Quoted to order","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":"5SY7402-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 15kA, 4-pole, D, 2A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","Type Of Voltage":"AC","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","acc. to IEC 81346-2":"F","at AC / rated value":"2 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"4P","acc. to DIN EN 61346-2":"F","at 35 °C / rated value":"2 A","at 40 °C / rated value":"1.9 A","at 45 °C / rated value":"1.85 A","at 50 °C / rated value":"1.8 A","at 55 °C / rated value":"1.75 A","at 60 °C / rated value":"1.7 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"D","acc. to EN 60898 / rated value":"15 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"50 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/302d7679e7bf199bf07131f2cb896100.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=395044&mlfb=5SY7402-8"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY7402-8?","answer":"Submit an RFQ through this listing. Pricing and stock are confirmed at quote time; the part is sourced through independent distribution."},{"question":"What is 5SY7402-8's listed depth?","answer":"Depth is 76 mm, with an installation depth of 70 mm."},{"question":"What is 5SY7402-8's listed width?","answer":"Width is 72 mm, corresponding to 4 modular width units on a DIN rail."},{"question":"What compliance documentation does Siemens provide for 5SY7402-8?","answer":"The part is halogen-free and silicon-free. It is designed to EN 60898 (15 kA) and IEC 60947-2 (50 kA), and carries an overvoltage category III rating with pollution degree 3. Specific RoHS/REACH/UL declarations are available from the manufacturer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7402-8","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/5SY7402-8 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}}