{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL1280-7MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL1280-7MB","canonicalUrl":"https://aoctrl.com/siemens/5SL1280-7MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL1280-7MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL1280-7MB miniature circuit breaker, 2-pole, C-curve, 80 A, 3 kA breaking capacity per IEC 60947-2 at 230/400 V AC, 2 MW units.","salesMarkdown":"## Siemens SENTRON 5SL1280-7MB — 2-pole C-curve MCB, 80 A, 3 kA The Siemens SENTRON 5SL1280-7MB is a 2-pole miniature circuit breaker with C-curve tripping characteristic, rated 80 A at 230/400 V AC. The 3 kA breaking capacity (IEC 60947-2) is the maximum prospective fault current this MCB can safely interrupt at its rated voltage. In a panel with a transformer-fed bus that can deliver 6 kA or more, this breaker would need upstream current-limiting protection — it is not a main, it is a downstream branch device. The 80 A rating at 230/400 V AC means it carries continuous load up to 80 A per pole; at 80 A and 230 V single-phase, expect about 9 W power loss per pole in hot state, so ventilation in a dense DIN-rail enclosure matters. The 2-pole design (2 MW units, 36 mm wide) switches both phase and neutral in single-phase circuits, or two phases in a multi-phase installation. Depth 76 mm, height 90 mm, width 36 mm (2 MW units). Mounting position any — no derating for horizontal or inverted orientation. Sealable with a lead seal for tamper-proof metering or critical circuits. Halogen-free and silicon-free construction for use in clean-room or corrosive-free environments.","metaTitle":"Siemens 5SL1280-7MB SENTRON MCB, 2P C-Curve 80A, 3kA","metaDescription":"Siemens SENTRON 5SL1280-7MB miniature circuit breaker, 2-pole, C-curve, 80 A rated, 3 kA breaking capacity per IEC 60947-2 at 230/400 V AC. 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":"5SL1280-7MB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400V 3kA, 2pole, C, 80A","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","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","supply voltage at AC rated value":"230 V","according to IEC 60947-2 rated value":"3 kA","Type Of Voltage Of The Operating Voltage":"AC","with multi-phase operation at AC maximum":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"253 V","vibration resistance according to IEC 60068-2-6":"no","Mechanical Service Life (Operating Cycles) Typical":"4 000","power loss [W] for rated value of the current at AC in hot operating state per pole":"9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/01871f27c0858ce24e07f5bfb1151b11.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1046738&mlfb=5SL1280-7MB"},"ai":{"faq":[{"question":"Where can I buy 5SL1280-7MB and how is it quoted?","answer":"The 5SL1280-7MB is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — no stock count or price is published here."},{"question":"What is the closest functional alternative to 5SL1280-7MB — 5SL6220-7?","answer":"The 5SL6220-7 is a 2-pole C-curve MCB in the same SENTRON family, but it is rated 20 A with a 6 kA breaking capacity per both EN 60898 and IEC 60947-2, versus the 5SL1280-7MB's 80 A and 3 kA. The 5SL6220-7 also has a higher mechanical life (10 000 cycles vs 4 000) and lower power loss (2.2 W vs 9 W per pole). They share the same 76 mm depth, 90 mm height, and DIN-rail footprint, so a panel designed for the 5SL6220-7 will physically accept the 5SL1280-7MB without rewiring, but the ampacity and breaking capacity differ — do not substitute without verifying the branch circuit's load and fault cur"},{"question":"What compliance documentation does Siemens provide for 5SL1280-7MB?","answer":"The 5SL1280-7MB carries IEC 60947-2 ratings (3 kA breaking capacity) and is designed for overvoltage category III, pollution degree 2. It is halogen-free and silicon-free. For specific RoHS, REACH, UL, or other regional declarations, refer to the manufacturer's compliance documentation available via the product's datasheet or Siemens Industry Online Support."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL1280-7MB","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/5SL1280-7MB 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}}