{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4125-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4125-7","canonicalUrl":"https://aoctrl.com/siemens/5SY4125-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4125-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4125-7, 1-pole C-curve miniature circuit breaker, 10 kA (EN 60898) / 20 kA (IEC 60947-2), 18 mm width, IP20.","salesMarkdown":"It carries dual ratings: 10 kA breaking capacity per IEC/EN 60898-1 and 20 kA per IEC 60947-2, with a UL 1077 listing at 5 kA for North American acceptance. For DC circuits, it's rated 15 kA at up to 72 V, so it works in 48 V or 60 V control-power loops. The 440 V AC multi-phase rating means it can be used on 400 V three-phase systems (line-to-line) without derating the voltage. ## Where it goes in the panel The 18 mm width (1 modular unit) keeps the footprint tight. The IP20 rating (with conductors connected) is standard for enclosed gear; it's not meant for washdown zones or outdoors without a cabinet.","metaTitle":"Siemens 5SY4125-7 SENTRON MCB, C-Curve, 1P, 10 kA","metaDescription":"Siemens SENTRON 5SY4125-7 miniature circuit breaker, 1-pole C-curve, 10 kA per EN 60898, 20 kA per IEC 60947-2. 18 mm width, IP20. Current lifecycle stage. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","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","at AC rated value":"400 V","at DC rated value":"60 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Energy Limitation Class":"3","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"C","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"20 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","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"2.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$9.60","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3502b686ab9542c20a03c3f7d5ac4039.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=483454&mlfb=5SY4125-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4125-7/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY4125-7 and what is the lead time?","answer":"We source it through independent distribution and quote to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here."},{"question":"What is the difference between 5SY4125-7 and 5SY4140-7?","answer":"The 5SY4140-7 is the 40 A version of the same 1-pole C-curve SENTRON MCB. Same 18 mm width, same dual breaking capacity ratings. The only difference is the amp rating — 25 A on the 5SY4125-7 versus 40 A on the sibling. They share the same DIN-rail footprint and terminal layout, so one can drop into a panel specified for the other as long as the load current matches the new rating."},{"question":"What compliance documentation does Siemens provide for 5SY4125-7?","answer":"The breaker is certified to IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077. It is halogen-free and silicon-free. Standard Siemens documentation includes the declaration of conformity and the product datasheet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4125-7","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/5SY4125-7 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}}