{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4305-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4305-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4305-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4305-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4305-8, 3-pole miniature circuit breaker, D tripping characteristic, 0.5 A rated current at 35 °C, 400 V AC, breaking capacity 10 kA per EN 60898 / 35 kA per IEC 60947-2, 54 mm width (3 modular units).","salesMarkdown":"The 5SY4305-8 carries a D tripping characteristic — magnetic trip threshold is 10–20× In, so it holds through the inrush of motor starters, solenoid valves, and small transformers without nuisance tripping on the start. At 0.5 A rated current, this breaker is sized for control-circuit protection, not main feeder duty. At 400 V AC this breaker clears a 35 kA prospective fault without cascading upstream, which gives the panel designer headroom for a high-fault utility feed. ## DIN-rail fit and thermal derating Width is 54 mm, which is 3 modular units on a standard DIN rail. Depth 76 mm, height 90 mm — leaves clearance for gland plates and wiring ducts. Mounting position is any; the quick-assembly system clips onto the rail without tools. Rated current is temperature-dependent: 0.5 A at 35 °C, derated to 0.48 A at 40 °C, 0.46 A at 45 °C, 0.45 A at 50 °C, 0.44 A at 55 °C, and 0.42 A at 60 °C. For a 40 °C panel interior — typical for a sealed enclosure with drives — budget the 0.48 A ceiling. The ambient humidity limits are 95 % up to 55 °C, tapering to 35 % at 75 °C.","metaTitle":"Siemens 5SY4305-8 3-Pole MCB DIN Rail, D-curve 0.5 A","metaDescription":"Siemens SENTRON 5SY4305-8 3-pole MCB, D tripping characteristic, rated 0.5 A at 35 °C, 400 V AC. Breaking capacity 10 kA (EN 60898) / 35 kA (IEC 60947-2).","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SY4305-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, D, 0.5 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"3","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":"400 V","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"3P","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":"3","Tripping Characteristic Class":"D","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"35 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 (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$234.61","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/28faa7a12a8fd30ac7de26de3b4c186b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=117237&mlfb=5SY4305-8"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4305-8","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/5SY4305-8 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}}