{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7305-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7305-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7305-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7305-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 3-pole, D characteristic, 400 V AC, 15 kA per EN 60898 / 50 kA per IEC 60947-2, 5SY7305-8.","salesMarkdown":"It is designed for motor and transformer protection where inrush currents exceed those of standard B or C curves — the D curve allows a higher short-term magnetic trip threshold, so it won't nuisance-trip on the start-up surge of a pump or compressor. At DC (per IEC 60947-2) it is rated 15 kA; under UL 1077 / CSA C22.2 No. 235 it carries 5 kA at AC. ## Environmental and compliance details Halogen-free and silicon-free construction. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. IP20 with connected conductors.","metaTitle":"Siemens 5SY7305-8 SENTRON MCB, D Curve, 3-Pole, 400V AC, 50k","metaDescription":"Siemens 5SY7305-8 SENTRON miniature circuit breaker, 3-pole, D tripping characteristic, 400V AC, 15kA (EN 60898) / 50kA (IEC 60947-2). Active production. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"54 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","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","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":"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 (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=28509&mlfb=5SY7305-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7305-8/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7305-8?","answer":"15 kA per EN 60898 and 50 kA per IEC 60947-2 at 400 V AC. At DC (IEC 60947-2) it is 15 kA; under UL 1077 / CSA C22.2 No. 235 it is 5 kA at AC."},{"question":"What is the D tripping curve used for?","answer":"The D characteristic allows a higher magnetic trip threshold, so the breaker tolerates the inrush current of motors and transformers without nuisance tripping."},{"question":"Where can I buy 5SY7305-8?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7305-8","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/5SY7305-8 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}}