{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5125-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5125-7","canonicalUrl":"https://aoctrl.com/siemens/5SY5125-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5125-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY5125-7, 1-pole C-curve miniature circuit breaker, 10 kA breaking capacity per IEC/EN 60898-2, 18 mm wide.","salesMarkdown":"## What it is and what it does The Siemens 5SY5125-7 is a 1-pole C-curve miniature circuit breaker from the SENTRON family, rated for 10 kA breaking capacity per IEC/EN 60898-2 and also listed to UL1077. It snaps onto a DIN rail in any mounting position and takes up one modular width (18 mm). The C-curve means it trips between 5 and 10 times rated current — the standard choice for motor circuits, transformers, and general inductive loads where you need to ride out inrush without nuisance trips. ## Where it fits At 18 mm wide and 76 mm deep, it fits a standard DIN-rail enclosure with 70 mm installation depth — no special backbox needed. The quick-assembly fastening system lets you clip it on or off without tools, and the combined top and bottom terminals accept both busbar and conductor connections. Sealable covers are available for panel builders who need to lock out adjustments.","metaTitle":"Siemens 5SY5125-7 SENTRON MCB, C-curve 1P 10kA, 18mm wide","metaDescription":"Siemens 5SY5125-7 SENTRON miniature circuit breaker, 1-pole C-curve, 10 kA per IEC/EN 60898-2, UL1077. 18 mm wide, 76 mm deep. Current production; sourced to order. Quoted on reque","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","title":"5SY5125-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-2, UL1077","description":"Circuit breaker Universal current 220 V DC 230/400 V AC 10kA, 1-pole, C, 25A","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":"220 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":"universal current","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"AC as required, observe DC polarity","Tripping Characteristic Class":"C","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","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":"250 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","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":"$20.57","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3bda7ffa87ab657ebf6036345c0b33d2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=456358&mlfb=5SY5125-7"},"ai":{"faq":[{"question":"Who supplies 5SY5125-7 and how is it quoted for volume purchases?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for your quantity."},{"question":"What is the closest functional second-source to 5SY5125-7?","answer":"The 5SY5240-7 is the same SENTRON 1-pole C-curve MCB in the same 18 mm footprint with the same 10 kA breaking capacity — the only difference is the rated current. It drops into the same panel without rewiring."},{"question":"What are the key dimensions of 5SY5125-7?","answer":"Width is 18 mm (one modular unit), depth is 76 mm, height is 90 mm. Installation depth is 70 mm."},{"question":"What compliance documentation does 5SY5125-7 carry?","answer":"It is certified to IEC/EN 60898-2 and UL1077. The part is halogen-free and silicon-free. Rated for overvoltage category III, pollution degree 3, and vibration resistance per IEC 60068-2-6."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5125-7","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/5SY5125-7 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}