{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5125-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5125-6","canonicalUrl":"https://aoctrl.com/siemens/5SY5125-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5125-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY5125-6 miniature circuit breaker, 1-pole, B characteristic, 10 kA (IEC/EN 60898-2), 15 kA (IEC 60947-2), 400 V AC / 220 V DC, 1 MW, IP20, halogen-free, silicon-free.","salesMarkdown":"The Siemens 5SY5125-6 is a 1-pole SENTRON miniature circuit breaker with a B tripping characteristic, rated to break 10 kA per IEC/EN 60898-2 and 15 kA per IEC 60947-2 at DC. It handles 400 V AC (single or multi-phase) and up to 220 V DC, making it suitable for universal-current branch circuits in distribution boards. In a panel with mixed loads, a B-curve MCB avoids nuisance tripping on modest surges while still clearing fast on a hard fault. If your fault-current study shows available short-circuit current above 10 kA at the panel, the 15 kA DC rating under IEC 60947-2 gives extra headroom for DC circuits — a useful margin for battery-backed or solar-combiner applications. The IP20 rating applies only with connected conductors — treat the busbar area as live when the cover is off. ## Where it goes in the panel Mounting position is unrestricted — horizontal, vertical, or flat — which helps when you're packing breakers into a tight gland plate layout. Combined terminals at both top and bottom accept copper conductors without separate busbar clamps. Listed to IEC / EN 60898-2 for residential-style MCB duty and to UL 1077 for supplementary protection in North American panels. The halogen-free and silicon-free construction means no corrosive off-gassing during a fault — important for sealed enclosures housing sensitive electronics. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz, so it holds up on a machine skid or near a reciprocating compressor.","metaTitle":"Siemens 5SY5125-6 SENTRON MCB, 1P, B-Curve, 10kA IEC/EN 6089","metaDescription":"Siemens 5SY5125-6 SENTRON miniature circuit breaker, 1-pole, B characteristic, 10 kA per IEC/EN 60898-2, 15 kA per IEC 60947-2. UL 1077 listed. Current production. Sourced 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","title":"5SY5125-6","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, B, 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":"B","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":"2.4 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/36f90d1ae71c3d794899d23ea9ba80be.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=507632&mlfb=5SY5125-6"},"ai":{"faq":[{"question":"Where can I buy 5SY5125-6 and what is the lead time?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm delivery commitment."},{"question":"What is the closest alternative to 5SY5125-6 in the same family?","answer":"Within the SENTRON 5SY series, the closest peer is a unit with the same B-curve and pole count but a different rated current. The 5SY5125-6 is a specific amp rating; the physical footprint, breaking capacity, and terminal layout are shared across the series, so swapping to a different current rating within the same family is straightforward if your load calculation allows it."},{"question":"What compliance documentation does Siemens provide for 5SY5125-6?","answer":"The breaker carries IEC / EN 60898-2 and UL 1077 listings. It is halogen-free and silicon-free, which supports RoHS and REACH compliance declarations typically available from Siemens on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5125-6","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/5SY5125-6 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}}