{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SP4491-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SP4491-8","canonicalUrl":"https://aoctrl.com/siemens/5SP4491-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SP4491-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SP4 series, miniature circuit breaker, 4-pole, D-curve, 100 A, 10 kA per EN 60898, 400 V AC, 50/60 Hz, 6 MW, DIN rail.","salesMarkdown":"## What this 100 A D-curve MCB is for The Siemens 5SP4491-8 is a 4-pole miniature circuit breaker from the SENTRON 5SP4 series, rated 100 A with a D tripping characteristic. It breaks fault currents up to 10 kA per EN 60898 at 400 V AC, 50/60 Hz. The D-curve (10–20× In) is designed for loads with high inrush currents — motor starters, transformers, welding equipment — where a B or C curve would nuisance-trip on startup. Four poles let it switch three-phase plus neutral in a single module, saving panel width compared to ganging single-pole breakers. The 6-module-width footprint (108 mm) and 70 mm installation depth fit standard DIN-rail enclosures. ## Key ratings and what they mean for fit The 10 kA breaking capacity (per EN 60898) is the maximum prospective fault current the breaker can safely interrupt at 400 V AC. For industrial panels fed from a transformer with a short-circuit rating above 10 kA, you need upstream current-limiting fuses or a higher-rated MCCB — this MCB is sized for sub-distribution boards where the available fault current is known to be ≤10 kA. Overvoltage category III and pollution degree 3 mean the breaker is rated for fixed installations inside the distribution board — not for outdoor or wet locations without additional enclosure. The IP20 rating with connected conductors (IP40 at the handle with a distribution cover) confirms it is intended for enclosed panel mounting, not open-air use. The D-curve characteristic (10–20× In) means the magnetic trip activates between 1000 A and 2000 A for this 100 A unit. That delay allows motor-starting currents (typically 6–8× FLA for a few cycles) to pass without tripping, while still clearing a hard short. For resistive or general-purpose loads, a B or C curve would be a better fit — this one is for inductive, high-inrush circuits. ## Mounting and integration Mounts on DIN rail (EN 60715) or via screw fixing — both methods are supported. The 70 mm installation depth leaves clearance for wiring behind the panel door. Tunnel terminals top and bottom accept copper conductors; the supply cord position is unrestricted, so feed from top or bottom as the layout demands. Sealable design allows the breaker to be locked in the OFF position for lockout/tagout procedures. Supplementary devices (shunt trip, auxiliary contacts) can be added via the product extension feature. The mechanical service life is rated at 10,000 operating cycles — typical for a distribution MCB, not a frequent-switching contactor.","metaTitle":"Siemens 5SP4491-8 SENTRON MCB, 4P D 100 A 10 kA","metaDescription":"Siemens 5SP4491-8 SENTRON miniature circuit breaker, 4-pole, D-curve, 100 A, 10 kA breaking capacity per EN 60898, 400 V AC. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"108 mm","title":"5SP4491-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 4-pole, D, 100 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"DIN rail and screw fixing","Mounting Position":"any","at AC rated value":"440 V","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","Tunnel Terminals Bottom":"Yes","Number Of Modular Width Units":"6","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/b86498c7947fbb4d046792080c7a3550.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=50590&mlfb=5SP4491-8"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SP4491-8?","answer":"10 kA per EN 60898 at 400 V AC, 50/60 Hz. That is the maximum fault current the breaker can safely interrupt at its rated voltage."},{"question":"What does the D-curve mean for this 100 A breaker?","answer":"The D tripping characteristic (10–20× In) means the magnetic trip activates between 1000 A and 2000 A. This is intended for loads with high inrush currents — motor starters, transformers, welding equipment — where a B or C curve would nuisance-trip on startup."},{"question":"Will 5SP4491-8 drop into a panel specified around 5SP4292-7?","answer":"Both are 4-pole SENTRON MCBs with the same 6-MW width (108 mm) and DIN-rail mounting, so the footprint is identical. However, 5SP4491-8 is a 100 A D-curve unit, while 5SP4292-7 is a different rating/curve — verify the load's inrush and continuous current before substituting. The mechanical fit is the same; the electrical fit depends on the circuit."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SP4491-8","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/5SP4491-8 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}}