{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8210-8BB08","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8210-8BB08","canonicalUrl":"https://aoctrl.com/siemens/5SY8210-8BB08","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8210-8BB08","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 2-pole, D tripping characteristic, 40 kA per IEC 60947-2, 5SY8210-8BB08.","salesMarkdown":"## What this MCB is and what the ratings mean for fit The Siemens SENTRON 5SY8210-8BB08 is a 2-pole miniature circuit breaker with a D tripping characteristic, designed for applications where high inrush currents are expected — typically motor starting, transformer primaries, or welding equipment. The D-curve means the magnetic trip threshold is 10 to 20 times the rated current, so it holds through the startup surge without nuisance tripping. The 40 kA breaking capacity at 400 V AC per IEC 60947-2 tells you this breaker can safely interrupt a fault current up to that level without welding contacts or cascading upstream — critical for high-fault panels. Under UL 1077 it carries a 5 kA interrupting rating, which governs its use in North American supplementary protection applications. The 2-pole design switches both line conductors; the neutral is not switched. Mounting is on a DIN rail via the quick assembly system, occupying 2 modular width units (36 mm). The housing is IP20 with connected conductors, so it's intended for enclosed panel installation — not for wet or dust-exposed locations. Ambient operating range is -40 °C to 75 °C, with humidity derating above 55 °C (max 95% RH at 55 °C, tapering to 35% at 75 °C). Overvoltage category III and pollution degree 3 confirm it's rated for fixed installation in industrial panels where transients are common. ## Integration notes for panel builders Depth is 76 mm (70 mm installation depth behind the panel face), width 36 mm (2 MW), height 90 mm. The quick-assembly fastening system snaps onto standard DIN rail; mounting position is any orientation. Combined terminals at top and bottom accept the supply from either end — no fixed line/load orientation. Supplementary devices (auxiliary switches, shunt trips, alarm contacts) can be installed on the side. Power loss is 0.9 W per pole in hot operating state at rated current — factor this into enclosure thermal calculations if the panel is densely populated.","metaTitle":"Siemens SENTRON 5SY8210-8BB08 MCB, 2-pole, D-curve, 40 kA IE","metaDescription":"Siemens SENTRON 5SY8210-8BB08 miniature circuit breaker, 2-pole, D tripping characteristic, 40 kA breaking capacity per IEC 60947-2. Active production, sourced to order. Quoted on","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY8210-8BB08","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 25kA, 2-pole, 10A, D=70 mm only magnetic tripping","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"400 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","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"Only magnetic tripping operation","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"2","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to IEC 60947-2 rated value":"40 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage Of The Operating Voltage":"AC","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","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":"0.9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f98522265794684cb7b2d4ae8ec7b346.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=345991&mlfb=5SY8210-8BB08"},"ai":{"faq":[{"question":"Where can I buy 5SY8210-8BB08 and what is the lead time?","answer":"This 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 5SY8210-8BB08?","answer":"40 kA at 400 V AC per IEC 60947-2, and 5 kA per UL 1077 for North American supplementary protection applications."},{"question":"What compliance documentation is available for 5SY8210-8BB08?","answer":"The part carries IEC 60947-2 and UL 1077 ratings. It is halogen-free and silicon-free. Standard RoHS and REACH declarations are available from the manufacturer on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8210-8BB08","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/5SY8210-8BB08 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}}