{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4125-7CV","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4125-7CV","canonicalUrl":"https://aoctrl.com/siemens/5SY4125-7CV","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4125-7CV","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY4125-7CV, 1-pole miniature circuit breaker, C-curve, 25 A rated, 15 kA breaking capacity per IEC 60947-2, 1 MW width, IP20.","salesMarkdown":"The Siemens 5SY4125-7CV is a 1-pole miniature circuit breaker with C-curve trip characteristic, rated 25 A at 35 °C and 230/400 V AC. ## Temperature derating — don't ignore it At 40 °C it derates to 22.22 A; at 45 °C to 20.7 A; at 50 °C to 19.1 A; at 55 °C to 17.27 A. The humidity limits are also specified: max 95% RH up to 55 °C, then dropping to 55% at 70 °C and 35% at 75 °C. This matters for washdown or outdoor cabinets. Single modular width (18 mm) on DIN rail, 76 mm depth, 90 mm height. The quick-assembly fastening system snaps onto standard EN rail. Mount in any position. Terminals accept combined top/bottom wiring — no special orientation needed. IP20 with conductors connected; pollution degree 3 (conductive pollution, typical for industrial panels). Installation depth 70 mm leaves clearance behind the rail.","metaTitle":"Siemens 5SY4125-7CV MCB, 1P C-Curve 25A 15kA IEC 60947-2","metaDescription":"Siemens 5SY4125-7CV miniature circuit breaker, 1-pole C-curve 25A rated, 15kA breaking capacity per IEC 60947-2. Active production, sourced to order. RFQ for volume pricing.","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","Standard":"IEC / EN 60947-2","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":"25 A","Installation Depth":"70 mm","Degree Of Pollution":"3","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","at 35 °C rated value":"25 A","at 40 °C rated value":"22.22 A","at 45 °C rated value":"20.7 A","at 50 °C rated value":"19.1 A","at 55 °C rated value":"17.27 A","according to EN 61346-2":"F","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","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","Supply Voltage Frequency Rated Value":"50/60 Hz","according to IEC 60947-2 rated value":"15 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","operating voltage at DC rated value maximum":"72 V","with single-phase operation at AC rated value":"250 V","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Switching 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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/eb71110ec2585e7dd7105f2eb05857a9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1531882&mlfb=5SY4125-7CV","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4125-7CV/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4125-7CV?","answer":"15 kA at 230/400 V AC per IEC 60947-2. That's the rated short-circuit breaking capacity — sufficient for most industrial sub-distribution boards."},{"question":"Will 5SY4125-7CV drop into a panel specified around 5SY4113-7CV?","answer":"Yes — same 1-pole form factor, same 18 mm width, same C-curve, same IEC 60947-2 standard. The difference is the current rating: 25 A vs 13 A. If the panel wiring and downstream protection are sized for 25 A, it's a direct mechanical swap. No rewiring needed for the breaker itself, but verify the load cable ampacity."},{"question":"Where can I buy 5SY4125-7CV and how is it quoted?","answer":"Sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time. Volume pricing drops with quantity — send the RFQ with your target MOQ."},{"question":"What compliance documentation does 5SY4125-7CV carry?","answer":"Rated per IEC / EN 60947-2. Halogen-free and silicon-free construction. The standard covers the safety and performance requirements for low-voltage switchgear. Additional documentation (RoHS, REACH, CE) is typically included with the shipment; request it on the PO if needed for your quality records."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4125-7CV","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/5SY4125-7CV 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}}