{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4125-6CC11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4125-6CC11","canonicalUrl":"https://aoctrl.com/siemens/5SY4125-6CC11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4125-6CC11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4125-6CC11, 1-pole miniature circuit breaker, 25 A, B characteristic, 10 kA breaking capacity per EN 60898, 18 mm width.","salesMarkdown":"## Key ratings and what they mean for your panel The 25 A rating at 35 °C is the headline figure, but the derating curve is what matters when the breaker sits in a warm enclosure: at 40 °C it carries 22.98 A, at 50 °C it drops to 20.72 A, and at 60 °C it is down to 18.22 A. If your panel ambient runs above 35 °C, size the load to the derated value, not the nameplate. The B characteristic (3–5 × In magnetic trip) is standard for resistive and general-purpose loads where nuisance tripping from inrush is not a concern — lighting circuits, small transformers, and control power feeds are typical. The 10 kA breaking capacity per EN 60898 means it safely interrupts a fault current up to that level; for systems with higher prospective fault current, a current-limiting upstream device is needed. Energy limitation class 3 indicates the let-through energy is low enough to protect downstream equipment in most coordination schemes. ## Environmental and compliance notes Halogen-free and silicon-free construction matters in railway and aerospace applications where outgassing can damage sensitive contacts or optics. The sealable design allows the installer to lock the toggle position with a padlock or wire seal, preventing unauthorized operation on critical circuits. Touch protection is integrated on the terminals, so accidental contact during maintenance is minimized. The operating temperature range of -40 °C to 75 °C covers cold-start conditions in unheated substations and hot enclosures near machinery. Humidity limits are specified: 95% RH at 55 °C, derating to 35% RH at 75 °C — relevant for tropical or washdown environments where condensation is a risk.","metaTitle":"Siemens 5SY4125-6CC11 SENTRON MCB, 1P, 25 A, B Curve, 10 kA","metaDescription":"Siemens 5SY4125-6CC11 SENTRON miniature circuit breaker, 1-pole, 25 A, B characteristic, 10 kA per EN 60898. Active lifecycle, sourced to order. IP20, 18 mm wide.","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","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","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","Design Of The Product":"For railway applications","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 35 °C / rated value":"25 A","at 40 °C / rated value":"22.98 A","at 45 °C / rated value":"21.88 A","at 50 °C / rated value":"20.72 A","at 55 °C / rated value":"19.53 A","at 60 °C / rated value":"18.22 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"1","Tripping Characteristic Class":"B","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","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","Type Of Voltage / Of The Operating Voltage":"AC","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Component / 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":"https://cdn.aoctrl.com/8b3ae05eab47be009ddab9f4af14744f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=411112&mlfb=5SY4125-6CC11","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4125-6CC11/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY4125-6CC11 and how do I get a price?","answer":"The 5SY4125-6CC11 is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ to confirm current availability and pricing at quote time."},{"question":"What is the depth of 5SY4125-6CC11?","answer":"The depth is 76 mm, with an installation depth of 70 mm. The 18 mm width (1 modular unit) and 90 mm height are standard for DIN-rail MCBs in this series."},{"question":"Will 5SY4125-6CC11 drop into a panel specified around 5SY4116-6CC without rewiring?","answer":"Yes, both are 1-pole SENTRON MCBs with the same 18 mm width, DIN-rail mounting, and terminal layout. The 5SY4125-6CC11 is a higher-current variant (25 A vs. 16 A) with the same B curve and 10 kA breaking capacity, so it is a direct mechanical swap if the load current allows."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4125-6CC11","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/5SY4125-6CC11 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}}