{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6520-7FC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6520-7FC","canonicalUrl":"https://aoctrl.com/siemens/5SJ6520-7FC","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6520-7FC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ6520-7FC, miniature circuit breaker (MCB), 1P+N, tripping characteristic C, 20 A rated current, 6 kA breaking capacity per EN 60898, 230 V AC, 2 modular width units.","salesMarkdown":"## SENTRON 5SJ6520-7FC — 20 A C-curve MCB, 1P+N, 6 kA The Siemens 5SJ6520-7FC is a SENTRON miniature circuit breaker rated 20 A with a C tripping characteristic, designed for single-phase AC circuits up to 230 V (250 V single-phase). The 1P+N pole design switches both line and neutral, with the neutral pole switching but not protected — a common arrangement for residential and light commercial distribution boards where a single-pole break on the phase is sufficient and the neutral follows for isolation. Breaking capacity is 6 kA per EN 60898, which covers most domestic and light commercial fault levels. The C-curve (5-10x In) handles moderate inrush from small motors, lighting ballasts, and transformers without nuisance tripping while still clearing short circuits fast enough for cable protection. ## DIN-rail fit and panel integration Width is 36 mm (2 modular units), depth 76 mm, height 90 mm. Snaps onto standard 35 mm DIN rail; installation depth is 70 mm behind the panel face. The 2-module width means it occupies two adjacent 18 mm slots — plan your distribution board fill accordingly. Mounting position is any, so vertical or horizontal rail orientation works. IP20 with connected conductors — suitable for enclosed distribution boards only, not for wet or dusty environments. Degree of pollution 2 (normal, non-conductive pollution only). Overvoltage category III, so it's rated for fixed installations downstream of the main panel breaker. ## Temperature derating — real-world current capacity Rated 20 A at 30 °C ambient. At 40 °C it derates to 18.48 A, and at 45 °C to 17.6 A. If your panel ambient runs hot (enclosed board, adjacent heat sources), apply the derated figure rather than the 20 A label — otherwise you risk nuisance tripping on a warm day or, worse, the breaker running above its calibrated thermal curve.","metaTitle":"Siemens 5SJ6520-7FC SENTRON MCB, 1P+N, C-curve, 20A, 6kA","metaDescription":"Siemens 5SJ6520-7FC SENTRON miniature circuit breaker, 1P+N, C-curve 20A, 6kA per EN 60898, 230V AC. Current production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SJ6520-7FC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature Circuit Breaker 6KA, 1+N-pole, C, 20A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P+N","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","at AC / rated value":"20 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","at 30 °C / rated value":"20 A","at 40 °C / rated value":"18.48 A","at 45 °C / rated value":"17.6 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","at DC / rated value / maximum":"72 V","Product Feature / Touch Protection":"No","according to EN 60898 / rated value":"6 kA","supply voltage / at AC / rated value":"230 V","Type Of Voltage / Of The Operating Voltage":"AC","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","Product Component / Neutral Conductor Switching":"Yes","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/5042b965b9ed09b7ac1a7140e9b2d1a1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1502731&mlfb=5SJ6520-7FC"},"ai":{"faq":[{"question":"Where can I buy the 5SJ6520-7FC and get a price?","answer":"The 5SJ6520-7FC is sourced to order against an RFQ through independent distribution. Submit a request for current pricing and availability — confirmed at quote time."},{"question":"How does the 5SJ6520-7FC compare to the 5SL6016-7KL?","answer":"The 5SL6016-7KL is a 16 A, 1-module (18 mm wide) MCB in the same SENTRON family. The 5SJ6520-7FC is wider (2 modules), rated 20 A, and switches the neutral pole. If your panel was laid out for the 5SL6016-7KL's 18 mm width, the 5SJ6520-7FC will not fit the same slot without a DIN-rail adapter or re-spacing — physically incompatible without panel modification."},{"question":"What are the key specifications of the 5SJ6520-7FC?","answer":"20 A C-curve, 1P+N, 6 kA breaking capacity per EN 60898, 230 V AC (250 V single-phase), 2 modular units wide (36 mm), IP20 with connected conductors, ambient range -40 to 75 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6520-7FC","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/5SJ6520-7FC 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}}