{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP4280-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP4280-8","canonicalUrl":"https://aoctrl.com/siemens/5SP4280-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SP4280-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP series, miniature circuit breaker, 5SP4280-8, 2-pole, D tripping characteristic, 80 A at 30 °C, 10 kA breaking capacity per EN 60898, 400 V AC.","salesMarkdown":"## What the ratings mean for fit The Siemens SENTRON 5SP4280-8 is a 2-pole miniature circuit breaker with a D tripping characteristic, rated 80 A at 30 °C and 400 V AC. The D-curve means it tolerates high inrush currents — typically used for motor, transformer, or lighting loads where the start-up surge would trip a B or C curve breaker. The 10 kA breaking capacity per EN 60898 certifies it can safely interrupt a fault current up to that level without damage, which is the standard for most commercial and light industrial distribution boards. Thermal derating is built into the spec: at 40 °C the continuous rating drops to 76 A, at 50 °C to 71.6 A, and at 60 °C to 67.2 A. If the panel ambient runs hot, size the upstream protection for the derated value, not the 30 °C headline number. ## Mounting and integration Snaps onto DIN rail or accepts screw fixing — both methods are listed. Occupies 3 modular width units (54 mm wide) on the rail. Depth is 76 mm; installation depth is 70 mm. Mounting position is unrestricted. Tunnel terminals at top and bottom accept conductors; touch protection is built in. IP20 with connected conductors, IP40 at the handle area with the distribution cover fitted. ## Environmental and compliance Halogen-free and silicon-free construction. Rated for pollution degree 3 (industrial environment) and overvoltage category III. Operating temperature range -40 °C to 75 °C. Shock resistance 150 m/s² at 11 ms half-sine per IEC 60068-2-27; vibration resistance 50 m/s² at 25 to 150 Hz and 60 m/s² at 35 Hz per IEC 60068-2-6.","metaTitle":"Siemens 5SP4280-8 SENTRON MCB, 2-Pole D-Curve 80 A, 10 kA","metaDescription":"Siemens SENTRON 5SP4280-8 miniature circuit breaker, 2-pole, D tripping characteristic, 80 A rated at 30 °C, 10 kA breaking capacity per EN 60898. Current lifecycle. Sourced to ord","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"DIN rail and screw fixing","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"FC","at AC / rated value":"80 A","protection class IP":"IP20 with connected conductors, IP40 in the area of the handle with distribution cover","Overvoltage Category":"3","Tunnel Terminals Top":"Yes","Design Of The Product":"5SP Miniature circuit breakers","acc. to DIN EN 61346-2":"F","Tunnel Terminals Bottom":"Yes","at 30 °C / rated value":"80 A","at 40 °C / rated value":"76 A","at 45 °C / rated value":"73.6 A","at 50 °C / rated value":"71.6 A","at 55 °C / rated value":"69.6 A","at 60 °C / rated value":"67.2 A","Number Of Modular Width Units":"3","Tripping Characteristic Class":"D","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","Influence Of The Surrounding Temperature":"Max. 95% rel. humidity","shock resistance / acc. to IEC 60068-2-27":"150m/s² at 11ms half-sine","Type Of Voltage / Of The Operating Voltage":"AC","vibration resistance / acc. to IEC 60068-2-6":"50m/s² at 25 to 150Hz and 60m/s² at 35Hz (4sec)","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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=232376&mlfb=5SP4280-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SP4280-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SP4280-8 and get current pricing?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of 5SP4280-8?","answer":"10 kA per EN 60898 at 400 V AC."},{"question":"What does the D tripping characteristic mean for this breaker?","answer":"The D-curve allows higher inrush without nuisance tripping — typical for motor, transformer, or welding loads where start-up current can reach 10–14 times the rated current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP4280-8","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/5SP4280-8 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}