{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6240-7FC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6240-7FC","canonicalUrl":"https://aoctrl.com/siemens/5SJ6240-7FC","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6240-7FC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 2-pole, C-curve, 40 A, 6 kA per EN 60898, 400 V AC, 72 V DC, 2 MW, IP20.","salesMarkdown":"The Siemens 5SJ6240-7FC is a SENTRON miniature circuit breaker (MCB) — a 2-pole, C-curve device rated 40 A at 400 V AC, with a 6 kA breaking capacity per EN 60898. Rated 72 V DC on each pole, so it handles DC control circuits or small battery-backed loads. The 40 A rating at 30 °C derates to 37.57 A at 40 °C and 36.8 A at 45 °C — expect to downrate by roughly 3 A per 10 °C above 30 °C if the panel runs warm. Pollution degree 2 (typical for clean, non-conductive environments) and overvoltage category III suit it for fixed-installation branch circuits in residential or infrastructure panels. ## Lifecycle and sourcing — active, not obsolete The SENTRON series is Siemens' standard MCB line for residential and infrastructure duty. The 2-pole, 2-module-width (36 mm) format is a common footprint that drops into any standard DIN-rail enclosure. No special adapter or rewiring needed if replacing an equivalent 2-pole C-curve 40 A MCB. Mounting position any, so vertical or horizontal rail orientation works. Sealable (can be locked in the OFF position with a padlock) — useful for lockout/tagout on a downstream load. Touch protection not fitted as standard; if the panel is open to live busbars, add a finger-safe terminal shield separately.","metaTitle":"Siemens 5SJ6240-7FC SENTRON MCB, 2-pole C-curve 40 A 6 kA","metaDescription":"Siemens SENTRON 5SJ6240-7FC miniature circuit breaker, 2-pole, C-curve, 40 A rated, 6 kA breaking capacity per EN 60898, 400 V AC, 72 V DC. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SJ6240-7FC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50 Hz","description":"Miniature Circuit Breaker 6kA, 2-pole, C, 40A","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","at AC / rated value":"40 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","at 30 °C / rated value":"40 A","at 40 °C / rated value":"37.57 A","at 45 °C / rated value":"36.8 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":"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/d1b7dbf45e25da6c5e1501e8fa43f03b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1502725&mlfb=5SJ6240-7FC"},"ai":{"faq":[{"question":"Will 5SJ6240-7FC drop into a panel built for 5SJ6325-7RC?","answer":"Only if the panel was designed for a 2-pole breaker. The 5SJ6325-7RC is a 3-pole, 54 mm wide (3 MW) device; the 5SJ6240-7FC is 2-pole, 36 mm wide (2 MW). The DIN-rail mounting and depth (76 mm) are the same, but the cutout width differs — you would need a blanking plate to fill the gap, and the wiring must match the 2-pole configuration."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6240-7FC","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/5SJ6240-7FC 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}}