{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8425-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8425-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8425-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8425-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, miniature circuit breaker, 5SY8425-8, 4-pole, 25 A rated current, D tripping characteristic, 30 kA breaking capacity per IEC 60947-2, IP20 with connected conductors.","salesMarkdown":"## Siemens 5SY8425-8 SENTRON MCB — 4-pole, 25 A, D curve, 30 kA The Siemens 5SY8425-8 is a 4-pole miniature circuit breaker from the SENTRON family, rated 25 A at AC with a D tripping characteristic and a breaking capacity of 30 kA per IEC 60947-2. Rated 25 A at 45 °C ambient, the 5SY8425-8 derates to 24.38 A at 50 °C and 23.72 A at 55 °C — per the datasheet, the thermal-magnetic trip element is calibrated to the 45 °C reference. The DC breaking capacity is 15 kA per IEC 60947-2, which covers most industrial DC bus applications; the UL 1077 / CSA C22.2 No.235 rating is 5 kA, so for North American supplementary protection installations the available fault current must stay under that limit. Touch protection is integrated per the product feature listing. Vibration resistance per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz. The sealable design allows lockout/tagout in safety circuits.","metaTitle":"Siemens 5SY8425-8 SENTRON MCB, 4P, 25 A, D Curve, 30 kA IEC","metaDescription":"Siemens 5SY8425-8 SENTRON miniature circuit breaker, 4-pole, 25 A rated current, D tripping characteristic, 30 kA breaking capacity per IEC 60947-2. Current lifecycle stage. Source","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":"5SY8425-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V D=70 mm 25 kA according to EN 60947-2, 4P, D25","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":"25 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 45 °C / rated value":"25 A","at 50 °C / rated value":"24.38 A","at 55 °C / rated value":"23.72 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"30 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/a0cfa0371067a580627991a7af0427f6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=431351&mlfb=5SY8425-8"},"ai":{"faq":[{"question":"Where can I buy 5SY8425-8?","answer":"The 5SY8425-8 is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of 5SY8425-8?","answer":"30 kA per IEC 60947-2 at AC, 15 kA per IEC 60947-2 at DC, and 5 kA per UL 1077 and CSA C22.2 No.235."},{"question":"What is the tripping characteristic of 5SY8425-8?","answer":"D curve — designed for loads with high inrush current such as motors, transformers, and welding equipment."},{"question":"What compliance documentation does Siemens provide for 5SY8425-8?","answer":"The breaker carries IEC 60947-2, UL 1077, and CSA C22.2 No.235 ratings. It is halogen-free and silicon-free. The specific RoHS and REACH declarations are available from Siemens documentation for the SENTRON 5SY8 series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8425-8","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/5SY8425-8 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}}