{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7405-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7405-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7405-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7405-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY7405-8, 4-pole, D tripping characteristic, rated current 0.5 A, breaking capacity 15 kA (EN 60898) / 50 kA (IEC 60947-2).","salesMarkdown":"The Siemens SENTRON 5SY7405-8 is a 4-pole miniature circuit breaker (MCB) with a D tripping characteristic, rated at 0.5 A at AC 50/60 Hz. The D-curve characteristic (10–20× In magnetic trip) lets the 0.5 A rating pass the magnetizing inrush of a small control transformer or the locked-rotor spike of a fractional-horsepower motor without nuisance tripping. But the thermal element is sensitive to enclosure temperature: at 40 °C ambient the continuous rating derates to 0.48 A, at 50 °C to 0.45 A, and at 60 °C to 0.42 A. At 4 modular width units (72 mm wide, 90 mm tall, 76 mm deep, 70 mm installation depth), it snaps onto a DIN rail via the quick-assembly system and accepts wiring from top and bottom combined terminals.","metaTitle":"Siemens SENTRON 5SY7405-8 MCB, 4P D 0.5A, 15/50 kA","metaDescription":"Siemens SENTRON 5SY7405-8 miniature circuit breaker, 4-pole, D-curve, 0.5 A rated. 15 kA per EN 60898, 50 kA per IEC 60947-2. Current production. Quoted on request.","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":"5SY7405-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 15kA, 4-pole, D, 0.5 A, 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":"0.5 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":"0.5 A","at 40 °C / rated value":"0.48 A","at 45 °C / rated value":"0.46 A","at 50 °C / rated value":"0.45 A","at 55 °C / rated value":"0.44 A","at 60 °C / rated value":"0.42 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/52eacbb4d4a8624778261ae2e7922704.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=290170&mlfb=5SY7405-8"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7405-8","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/5SY7405-8 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}}