{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP4391-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP4391-8","canonicalUrl":"https://aoctrl.com/siemens/5SP4391-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SP4391-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP4391-8, 3-pole miniature circuit breaker, D tripping characteristic, 100 A rated at 400 V AC, 10 kA breaking capacity per EN 60898, DIN-rail mount.","salesMarkdown":"## Siemens 5SP4391-8 — 100 A D-curve MCB for high-inrush loads The Siemens 5SP4391-8 is a SENTRON miniature circuit breaker with a D tripping characteristic, rated 100 A at 400 V AC and 50/60 Hz. For a panel fed from a transformer with a high prospective short-circuit current, this rating governs whether the MCB coordinates with the upstream fuse or breaker. Three-pole construction (3P) with a width of 4.5 modular units (81 mm). Mounts on DIN rail or via screw fixing in any orientation — no derating for horizontal installation. Rated 100 A at 30 °C ambient, it derates to 95 A at 40 °C, 92 A at 45 °C, 89.5 A at 50 °C, 87 A at 55 °C, and 84 A at 60 °C. In a sealed, high-density panel at 50 °C, the usable current is about 10 % below the nameplate — plan the load circuit accordingly. Part of the Siemens SENTRON 5SP series, halogen-free and silicon-free, with tunnel terminals top and bottom for stranded or solid conductors. The 4.5 MW width (81 mm) occupies a standard DIN-rail slot; tunnel terminals accept conductors without ferrules for quick wiring. Sealable cover is standard for lockout/tagout compliance. IP20 with connected conductors;","metaTitle":"Siemens 5SP4391-8 SENTRON MCB, 3P D 100 A 400 V, 10 kA","metaDescription":"Siemens 5SP4391-8 SENTRON miniature circuit breaker, 3-pole D-curve, 100 A at 400 V AC, 10 kA breaking capacity per EN 60898. Current lifecycle, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"81 mm","title":"5SP4391-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, D, 100 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Fastening Method":"DIN rail and screw fixing","Mounting Position":"any","at AC rated value":"100 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","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","at 30 °C rated value":"100 A","at 40 °C rated value":"95 A","at 45 °C rated value":"92 A","at 50 °C rated value":"89.5 A","at 55 °C rated value":"87 A","at 60 °C rated value":"84 A","Tunnel Terminals Bottom":"Yes","according to EN 61346-2":"F","according to IEC 81346-2":"FC","Number Of Modular Width Units":"4.5","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"10 kA","Influence Of The Surrounding Temperature":"Max. 95% rel. humidity","Type Of Voltage Of The Operating Voltage":"AC","Value Range Of The Supply Voltage Frequency":"50/60 Hz","shock resistance according to IEC 60068-2-27":"150m/s² at 11ms half-sine","with multi-phase operation at AC rated value":"440 V","vibration resistance according to IEC 60068-2-6":"50m/s² at 25 to 150Hz and 60m/s² at 35Hz (4sec)","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b911b47d3946a3a04c5aaef3572eae19.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=437001&mlfb=5SP4391-8"},"ai":{"faq":[{"question":"What is the 5SP4391-8 used for?","answer":"The 5SP4391-8 is a 3-pole miniature circuit breaker with a D tripping characteristic, rated 100 A at 400 V AC. It is used for protecting circuits with high inrush currents, such as motor feeders, transformers, and welding equipment in industrial control panels."},{"question":"What are the key dimensions of the 5SP4391-8?","answer":"The 5SP4391-8 has a depth of 76 mm, a width of 81 mm, and a height of 90 mm. Installation depth is 70 mm."},{"question":"Where can I buy the 5SP4391-8?","answer":"The 5SP4391-8 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"How does the 5SP4391-8 compare to the 5SL4363-7?","answer":"The 5SL4363-7 is a different Siemens series (5SL) with a narrower width of 3 MW (54 mm) versus the 5SP's 4.5 MW (81 mm). The 5SP4391-8 carries a higher 100 A rating and a D-curve for high-inrush loads, while the 5SL4363-7 is typically a lower-current C-curve device. They are not drop-in replacements — the panel cutout and wiring must be re-evaluated."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP4391-8","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/5SP4391-8 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}}