{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4201-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4201-8","canonicalUrl":"https://aoctrl.com/siemens/5SL4201-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4201-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4201-8 miniature circuit breaker, 2-pole, D tripping characteristic, 1 A rated, 10 kA breaking capacity at 400 V AC.","salesMarkdown":"The Siemens 5SL4201-8 is a 2-pole miniature circuit breaker from the SENTRON series, rated 1 A with a D tripping characteristic and a 10 kA breaking capacity per both EN 60898 and IEC 60947-2. That D-curve means it tolerates the high inrush currents typical of motor loads, transformers, or solenoid banks — the magnetic trip threshold sits higher than a B or C curve, so nuisance tripping on startup is less likely. The 10 kA interrupting rating at 400 V AC tells you it can safely clear a fault up to that level without upstream fuses needing to act first, which simplifies coordination in a distribution board. ## DIN-rail fit and panel integration Two modular-width units wide (36 mm), 76 mm deep, 90 mm tall — it snaps onto standard DIN rail and occupies the same footprint as any other 2-pole SENTRON MCB. Mounting position is unrestricted, so you can orient it vertically or horizontally inside the enclosure without derating the thermal trip. The 70 mm installation depth leaves room behind the busbar stack in a typical 120 mm deep distribution board. IP20 with conductors connected, which is the norm for enclosed panel-mount breakers — not rated for washdown or outdoor exposure. Overvoltage category III and pollution degree 2 confirm it's intended for fixed-installation distribution boards, not portable equipment. ## Thermal derating and ambient limits The 1 A nominal rating holds at 30 °C ambient. At 40 °C it derates to 0.96 A, at 45 °C to 0.94 A, and at 55 °C to 0.9 A. If your panel runs hot — say next to a VFD or transformer — the actual continuous current the breaker can carry without nuisance tripping drops by roughly 4–10 %. The operating range spans -40 °C to 75 °C, so cold starts in unheated enclosures are fine; the storage limit is the same 75 °C maximum.","metaTitle":"Siemens 5SL4201-8 SENTRON MCB, 2P D 1A 10kA","metaDescription":"Siemens 5SL4201-8 SENTRON miniature circuit breaker, 2-pole, D-curve, 1 A rated, 10 kA breaking capacity per EN 60898/IEC 60947-2. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SL4201-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 2-pole, D, 1 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"1 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 30 °C / rated value":"1 A","at 40 °C / rated value":"0.96 A","at 45 °C / rated value":"0.94 A","at 55 °C / rated value":"0.9 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","acc. to IEC 60947-2 / rated value":"10 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","Type Of Voltage / Of The Operating Voltage":"AC","with multi-phase operation / at AC / maximum":"440 V","Product Component / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 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/7404ae85aaaa1f58b9c29459ca8938a8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=285515&mlfb=5SL4201-8"},"ai":{"faq":[{"question":"Where can I buy the 5SL4201-8 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ through the storefront."},{"question":"What is the 5SL4201-8's breaking capacity?","answer":"It carries a 10 kA breaking capacity at 400 V AC, rated per both EN 60898 and IEC 60947-2. That's the same rating for both standards, so it qualifies for residential and industrial distribution boards alike."},{"question":"Will the 5SL4201-8 drop into a panel specified around the 5SL3340-7CC?","answer":"Both are 2-pole SENTRON MCBs on the same DIN-rail footprint — same 36 mm width, same 76 mm depth. The difference is the tripping curve and current rating: the 5SL4201-8 is a D-curve 1 A breaker, while the 5SL3340-7CC is a different characteristic and amp rating. If the panel schedule calls for a D-curve 1 A device, the 5SL4201-8 fits mechanically and electrically; verify the existing busbar and load wiring match the 1 A rating before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4201-8","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/5SL4201-8 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}}