{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4325-8FA","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4325-8FA","canonicalUrl":"https://aoctrl.com/siemens/5SY4325-8FA","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4325-8FA","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY4325-8FA, D characteristic, 3-pole, 25 A rated, 10 kA breaking capacity per EN 60898, AC 440 V.","salesMarkdown":"## What it is and what it does The Siemens SENTRON 5SY4325-8FA is a 3-pole miniature circuit breaker (MCB) with a D tripping characteristic, rated 25 A at 35 °C and breaking 10 kA per EN 60898 at 440 V AC. The D curve means it tolerates high inrush currents — typical for motor, transformer, or welding loads — without nuisance tripping, while still clearing a fault fast enough to protect the downstream cable. It occupies 3 modular width units (54 mm) on a DIN rail and mounts in any position, which simplifies panel layout when space is tight. ## Ratings and what they mean for fit The 25 A rating holds at 35 °C ambient; at 40 °C it derates to 23.8 A, and at 55 °C to 21.88 A. If your panel runs hot — say, inside a crowded enclosure near other heat sources — you need to account for that derating or step up to a higher-rated frame. The 10 kA breaking capacity per EN 60898 is the standard for residential and light commercial distribution boards; for industrial panels with higher available fault current, you'd want to verify the SCCR at the panel level. The 440 V AC rating covers both single-phase and multi-phase operation, so it works across 230/400 V systems common in European and Asian installations. ## Integration notes Mounts on a DIN rail via the quick assembly system — no tools needed for snapping on or off. The combined terminal at top and bottom accepts the same conductor size, so wiring order doesn't matter. Depth is 76 mm (installation depth 70 mm), which fits standard 80 mm deep enclosures. IP20 with connected conductors means it's protected against finger contact but not washdown; keep it inside a sealed panel if the environment is wet or dusty. Pollution degree 3 and overvoltage category III suit it for fixed installations in industrial or commercial buildings.","metaTitle":"Siemens 5SY4325-8FA SENTRON MCB, 25 A, D Curve, 3-Pole, 10 k","metaDescription":"Siemens SENTRON 5SY4325-8FA miniature circuit breaker, 25 A rated, D tripping characteristic, 3-pole, 10 kA breaking capacity per EN 60898. Active lifecycle, sourced to order again","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SY4325-8FA","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, 25A, D=70 mm as counter preliminary miniature circuit breaker","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"25 A","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","Design Of The Product":"As automatic meter","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","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"3","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","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","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","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","power loss [W] for rated value of the current at AC in hot operating state per pole":"2.1 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/75fb078bfa2cb651646a618d13fec9de.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=90390&mlfb=5SY4325-8FA"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY4325-8FA?","answer":"Submit an RFQ through this listing; we source and quote to order through independent distribution, with availability and current pricing confirmed at quote time."},{"question":"What is 5SY4325-8FA's listed depth?","answer":"The depth is 76 mm, with an installation depth of 70 mm."},{"question":"What is 5SY4325-8FA's listed width?","answer":"The width is 54 mm, which corresponds to 3 modular width units on a DIN rail."},{"question":"Will 5SY4325-8FA drop into a panel specified around 5SY4316-7CV without rewiring?","answer":"Both are 3-pole SENTRON MCBs on the same DIN-rail footprint, so the mechanical fit is identical. The electrical difference is the rating and curve — verify the load current and inrush profile before swapping."},{"question":"What compliance documentation does Siemens provide for 5SY4325-8FA?","answer":"The part is designed to EN 60898 for breaking capacity and carries the SENTRON brand's standard declarations. For specific RoHS, REACH, or UL documentation, request it with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4325-8FA","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/5SY4325-8FA 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}}