{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4350-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4350-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4350-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4350-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4350-8 miniature circuit breaker, 3-pole, D tripping characteristic, 10 kA per EN 60898 / 15 kA per IEC 60947-2, 400 V AC, 3 modular width units.","salesMarkdown":"## D-Curve Trip — Built for High-Inrush Loads The 5SY4350-8: The D tripping characteristic means this breaker holds through the magnetizing inrush of transformers, solenoid banks, and small motor starters without nuisance tripping — the magnetic release threshold sits around 10–20× rated current, well above the C-curve range. Rated 400 V AC for multi-phase operation, 60 V DC per pole — the DC rating drops because the arc extinguishes differently without a zero-crossing. Breaking capacity is 10 kA per EN 60898-1 for general distribution, 15 kA per IEC 60947-2 for industrial panel duty — that extra 5 kA matters when the transformer fault current is higher than the domestic standard. ## Panel Fit and Environmental Range Three modular width units (54 mm wide) on standard DIN rail — the quick-assembly system clips on without tools and the supply can land on either end. Depth is 76 mm, installation depth 70 mm — leaves clearance for wiring gutters in a 200 mm deep enclosure. Ambient range -40 °C to 75 °C with humidity derating: max 95% RH at 55 °C, dropping to 35% at 75 °C — the plastic housing and internal bimetal track the moisture limits. IP20 with conductors connected — not sealed for washdown, but fine for dry indoor panels. ## Certification and Compliance Package Dual-rated to IEC/EN 60898-1 (domestic/similar) and IEC/EN 60947-2 (industrial) plus UL 1077 — covers most global panel specs without a second breaker. Halogen-free and silicon-free construction — important for clean-room or corrosive-environment panels where outgassing contaminates contacts or optics. Vibration tested per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — holds up on machine-mounted enclosures near rotating equipment. Sealable — the toggle can be locked in the off position for lockout/tagout compliance.","metaTitle":"Siemens 5SY4350-8 SENTRON MCB, 3-Pole, D-Curve, 10/15 kA","metaDescription":"Siemens 5SY4350-8 SENTRON 3-pole MCB, D-curve, 10 kA (EN 60898) / 15 kA (IEC 60947-2) breaking capacity. Active production, sourced to order. Request a 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":"54 mm","title":"5SY4350-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V 10kA, 3-pole, D, 50 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"400 V","at DC rated value":"60 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","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"3","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"15 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","at DC according to IEC 60947-2 rated value":"15 kA","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","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.7 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$97.79","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1723671e6331f3997321231264d149a0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=194942&mlfb=5SY4350-8"},"ai":{"faq":[{"question":"Will 5SY4350-8 drop into a panel wired for 5SY4350-7CV?","answer":"Both are 3-pole SENTRON MCBs on the same DIN-rail footprint with the same 3-module width. The difference is the trip curve: 5SY4350-8 is D-curve (10–20× In magnetic trip), while 5SY4350-7CV is C-curve (5–10× In). If the existing panel was coordinated for C-curve selectivity, swapping to D-curve may change the trip coordination downstream — check the load inrush before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4350-8","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/5SY4350-8 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}}