{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4520-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4520-6","canonicalUrl":"https://aoctrl.com/siemens/5SY4520-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4520-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY4520-6, 20 A rated, B characteristic, 2-pole (1P+N), 10 kA breaking capacity per EN 60898, 20 kA per IEC 60947-2, IP20, 2 MW.","salesMarkdown":"The Siemens SENTRON 5SY4520-6 is a 2-pole (1P+N) miniature circuit breaker rated 20 A at 35 °C with a B tripping characteristic. It's not for motor starting; that's a C or D curve. ## Breaking capacity and standards That dual rating is standard for MCBs that carry both the household (EN 60898) and industrial (IEC 60947-2) marks. The 10 kA figure governs typical domestic / commercial fault levels; the 20 kA figure applies when the MCB is used as a circuit breaker under the industrial standard, which allows higher prospective fault currents. Also carries UL1077 recognition as a supplementary protector — useful for North American panels where the MCB is not the main service disconnect but backs up branch protection. ## Thermal derating — the real-world current The 20 A rating holds at 35 °C ambient. Above that, the thermal-magnetic trip unit derates: 18.78 A at 40 °C, 18.14 A at 45 °C, 17.48 A at 50 °C, 16.8 A at 55 °C, 16.08 A at 60 °C. If your panel runs warm — say 50 °C inside a sealed enclosure — you're effectively getting a 17.5 A breaker. Plan the load accordingly; don't size to the 20 A nameplate if the ambient is above 35 °C. Installation depth is 70 mm; the overall depth is 76 mm, so it clears a standard 80 mm deep enclosure.","metaTitle":"Siemens SENTRON 5SY4520-6 MCB, 20 A, 10 kA, B Curve, 2-Pole","metaDescription":"Siemens SENTRON 5SY4520-6 miniature circuit breaker, 20 A rated, B tripping characteristic, 10 kA (EN 60898) / 20 kA (IEC 60947-2), 2-pole 1P+N, IP20. Current production. Quoted to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY4520-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 230 V 10kA, 1+N-pole, B, 20 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P+N","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"20 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Energy Limitation Class":"3","according to EN 61346-2":"F","at 35 °C / rated value":"20 A","at 40 °C / rated value":"18.78 A","at 45 °C / rated value":"18.14 A","at 50 °C / rated value":"17.48 A","at 55 °C / rated value":"16.8 A","at 60 °C / rated value":"16.08 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"Yes","Number Of Modular Width Units":"2","Tripping Characteristic Class":"B","Position / Of Power Supply Cord":"Any","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","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","at DC / according to IEC 60947-2 / rated value":"15 kA","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","with single-phase operation / at AC / rated value":"250 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f09e338e6514d60408056618e1f9e8a3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=71424&mlfb=5SY4520-6"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY4520-6?","answer":"Submit an RFQ through the storefront. The part is sourced to order; pricing and stock levels are confirmed at quote time."},{"question":"What is 5SY4520-6's listed depth (76 mm) on this component line?","answer":"Overall depth is 76 mm; installation depth (behind the panel face) is 70 mm."},{"question":"What is 5SY4520-6's listed width (36 mm) on this component line?","answer":"Width is 36 mm, which corresponds to 2 modular width units on a DIN rail."},{"question":"Will 5SY4520-6 drop into a panel that was specified around 5SY4140-7 without rewiring?","answer":"No — the 5SY4140-7 is a 1-pole breaker without neutral switching. The 5SY4520-6 is 2-pole (1P+N) and requires a neutral connection. The footprint is the same 2 MW width, but the wiring differs."},{"question":"What compliance documentation does this brand provide for 5SY4520-6 (RoHS, REACH, UL, IEC)?","answer":"The MCB is certified to IEC/EN 60898-1 and IEC/EN 60947-2, and carries UL1077 recognition. It is halogen-free and silicon-free, which supports RoHS and REACH compliance declarations."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4520-6","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/5SY4520-6 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}}