{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5125-7KK11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5125-7KK11","canonicalUrl":"https://aoctrl.com/siemens/5SY5125-7KK11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5125-7KK11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY5125-7KK11, 1-pole miniature circuit breaker, 25 A rated current, C tripping characteristic, 10 kA breaking capacity per EN 60898, 18 mm width, IP20.","salesMarkdown":"The Siemens SENTRON 5SY5125-7KK11 is a 1-pole miniature circuit breaker with a 25 A rated current and C-curve tripping characteristic, giving it a magnetic trip threshold of 5–10× In — suited for moderate inrush loads like small motors, lighting banks, and transformer primaries where the start-up surge exceeds a B-curve's range but doesn't need the D-curve's 10–20× headroom. Breaking capacity is 10 kA per EN 60898 (AC) and 10 kA per EN 60898-2 (DC), which means it safely interrupts fault currents up to that level without welding contacts or cascading upstream — a standard fit for most residential, commercial, and light industrial distribution boards where the prospective short-circuit current stays under 10 kA. The part carries a universal-current rating (AC and DC), so it handles DC circuits up to 220 V with the same 10 kA interrupting capacity, but note the supply polarity: AC can be fed from either side, while DC requires correct polarity per the marking on the device. Temperature derating is published from 35 °C upward: full 25 A at 35 °C, then 23.8 A at 40 °C, dropping to 21.2 A at 60 °C. Functional marking per EN 61346-2 and IEC 81346-2: letter F (protective device). The part carries the SENTRON brand and is listed as a miniature circuit breaker in the Siemens catalog.","metaTitle":"Siemens 5SY5125-7KK11 SENTRON MCB, 25A 1P C-Curve, 10kA","metaDescription":"Siemens SENTRON 5SY5125-7KK11 miniature circuit breaker, 25A rated, 1-pole, C characteristic, 10 kA breaking capacity per EN 60898. Current lifecycle stage, sourced to order agains","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","at AC / rated value":"25 A","at DC / rated value":"220 V","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"For railway applications","Energy Limitation Class":"3","according to EN 61346-2":"F","at 35 °C / rated value":"25 A","at 40 °C / rated value":"23.8 A","at 45 °C / rated value":"23.18 A","at 50 °C / rated value":"22.55 A","at 55 °C / rated value":"21.88 A","at 60 °C / rated value":"21.2 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"universal current","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","Position / Of Power Supply Cord":"AC as required, observe DC polarity","at DC / according to EN 60898-2":"10 kA","according to EN 60898 / rated value":"10 kA","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/DC","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","at DC / according to IEC 60947-2 / rated value":"15 kA","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"250 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","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=267933&mlfb=5SY5125-7KK11","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY5125-7KK11/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5125-7KK11","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/5SY5125-7KK11 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}}