{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8432-8BB08","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8432-8BB08","canonicalUrl":"https://aoctrl.com/siemens/5SY8432-8BB08","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8432-8BB08","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8432-8BB08 miniature circuit breaker, 4-pole, D tripping characteristic, 30 kA breaking capacity at 400 V AC per IEC 60947-2, 4 modular width units.","salesMarkdown":"## Siemens SENTRON 5SY8432-8BB08 — 4-pole D-curve MCB, 30 kA IEC breaking capacity The Siemens SENTRON 5SY8432-8BB08 is a 4-pole miniature circuit breaker with a D tripping characteristic, rated for 400 V AC (multi-phase) and 440 V AC single-phase operation at 50/60 Hz. Its 30 kA breaking capacity per IEC 60947-2 at 400 V AC means it can safely interrupt high fault currents in industrial distribution — the D curve provides a higher magnetic trip threshold (10–20× In), suited for loads with high inrush such as motors, transformers, or welding equipment where a B or C curve would nuisance-trip on startup. IP20 protection (with connected conductors) is standard for enclosed panel use. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz, making it suitable for machinery mounted on vibrating equipment. The unit is halogen-free and silicon-free, and its sealable design supports tamper-evident locking for compliance-sensitive installations. ## Lifecycle & sourcing — active production, quoted to order The breaker accepts plug-in auxiliary devices (shunt trip, alarm switch, auxiliary contact) via the product extension interface, allowing field-configurable signaling without replacing the base unit. ## Integration notes — DIN-rail fit and ambient derating Installation depth is 70 mm, leaving clearance behind the panel for wiring. Ambient temperature range is -40 °C to +75 °C, with humidity limits: max 95% RH at 55 °C, derating to 35% RH at 75 °C. ## Regulatory & compliance — approvals and documentation Rated per IEC 60947-2 (30 kA at 400 V AC) and also carries a 5 kA rating per UL 1077 / CSA C22.2 No. 235 for North American supplementary protection applications. The DC rating is limited to 72 V maximum — not a general-purpose DC breaker for higher voltages. The product is halogen-free and silicon-free, meeting common environmental compliance requirements for industrial equipment. Documentation (datasheet, CE declaration, RoHS/REACH statements) is available on request.","metaTitle":"Siemens 5SY8432-8BB08 SENTRON MCB, 4P, D-curve, 30 kA IEC","metaDescription":"Siemens SENTRON 5SY8432-8BB08 miniature circuit breaker, 4-pole, D tripping characteristic, 30 kA breaking capacity per IEC 60947-2. Active production, sourced to order. Request qu","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","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":"4","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to IEC 60947-2 rated value":"30 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":"2.1 W"}},"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=108317&mlfb=5SY8432-8BB08","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8432-8BB08/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8432-8BB08","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/5SY8432-8BB08 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}}