{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6125-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6125-8","canonicalUrl":"https://aoctrl.com/siemens/5SY6125-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6125-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6 series, miniature circuit breaker (MCB), 1-pole, 25 A, D tripping characteristic, 6 kA (EN 60898) / 15 kA (IEC 60947-2), 400 V AC, 18 mm wide, IP20.","salesMarkdown":"## What it is and what it does The Siemens 5SY6125-8 is a 1-pole SENTRON miniature circuit breaker (MCB) with a D tripping characteristic, rated 25 A at 400 V AC. It snaps onto a DIN rail via the quick-assembly system and occupies a single 18 mm width unit — standard for panel integration. The D curve means it tolerates high inrush currents — typical for motor, transformer, or lighting ballast loads — without nuisance tripping. For fault clearing, it delivers 6 kA breaking capacity per EN 60898 and 15 kA per IEC 60947-2, so it handles moderate fault levels in industrial sub-distribution. Rated for 400 V AC (overvoltage category III) and up to 72 V DC, with a maximum 15 kA DC breaking capacity per IEC 60947-2. The housing is halogen-free and silicon-free, and touch protection is built in. ## Where it fits Mounts in any position on a DIN rail; installation depth is 70 mm, overall depth 76 mm. The combined terminals at top and bottom accept wiring from any direction, and the breaker is sealable for panel-lockout procedures. IP20 with connected conductors — suitable for enclosed panel use, not for washdown or outdoor exposure. Ambient range spans -40 °C to 75 °C, with derating for humidity above 55 °C.","metaTitle":"Siemens 5SY6125-8 SENTRON MCB, 1P, 25 A, D Curve, 6 kA","metaDescription":"Siemens 5SY6125-8 SENTRON miniature circuit breaker, 1-pole, 25 A, D tripping characteristic, 6 kA per EN 60898, 15 kA per IEC 60947-2. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50/60 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","Number of poles":"1","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"1","Number of poles / Note":"1P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY6","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"25 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"15 kA","Product feature / Touch protection":"Yes","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","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 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":"$19.77","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=359084&mlfb=5SY6125-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY6125-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY6125-8 and how do I get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at that time."},{"question":"What is the difference between 5SY6125-8 and 5SY3132-6?","answer":"The 5SY3132-6 is a 32 A B-curve MCB in the same SENTRON family, so it has a lower inrush tolerance (B curve) and higher current rating. The 5SY6125-8 with D curve is better suited for motor or transformer branch circuits where start-up current is high."},{"question":"What compliance documentation does the brand provide for 5SY6125-8?","answer":"The breaker carries ratings per EN 60898 (6 kA), IEC 60947-2 (15 kA), and UL 1077 / CSA C22.2 No.235 (5 kA). It is halogen-free and silicon-free, and the housing is touch-protected."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6125-8","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/5SY6125-8 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}}