{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4320-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4320-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SY4320-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4320-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4320-8CC, 3-pole miniature circuit breaker, D tripping characteristic, 20 A rated current (35 °C), 10 kA breaking capacity per EN 60898, 440 V AC, 3 MW units.","salesMarkdown":"The Siemens 5SY4320-8CC is a SENTRON 3-pole miniature circuit breaker with a D tripping characteristic, rated 20 A at 35 °C and 10 kA breaking capacity per EN 60898 at 440 V AC. ## Thermal derating and environment The 20 A rating holds at 35 °C ambient. At 40 °C it derates to 18.8 A, at 50 °C to 17.52 A, and at 55 °C to 16.84 A. The breaker also handles humidity up to 95% at 55 °C, tapering to 35% at 75 °C. ## What it does and where it goes As a miniature circuit breaker (MCB), it protects downstream wiring and loads against overloads and short circuits. The D curve is the key selection parameter: it's designed for circuits with high inrush — think motor feeders, solenoid banks, or small transformers in industrial control panels. The 3-pole configuration handles three-phase loads; there's no neutral pole switching, so the neutral must be connected separately if the circuit requires it.","metaTitle":"Siemens 5SY4320-8CC SENTRON MCB, 3P D-Curve 20A, 10kA","metaDescription":"Siemens 5SY4320-8CC SENTRON miniature circuit breaker, 3-pole, D tripping characteristic, 20 A rated at 35 °C, 10 kA breaking capacity per EN 60898. Active production. Available to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SY4320-8CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, D, 20A","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":"20 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","Overvoltage Category":"III","Combined Terminal Top":"Yes","at 35 °C rated value":"20 A","at 40 °C rated value":"18.8 A","at 45 °C rated value":"18.18 A","at 50 °C rated value":"17.52 A","at 55 °C rated value":"16.84 A","according to EN 61346-2":"F","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","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","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":"1.6 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/8b2304835e51a3d73c049c61d7d6abb9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=397149&mlfb=5SY4320-8CC"},"ai":{"faq":[{"question":"Where can I buy 5SY4320-8CC?","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 D tripping characteristic used for?","answer":"The D curve (tripping characteristic class D) is designed for circuits with high inrush currents, such as motor starters, transformers, or welding equipment, where a B or C curve would nuisance-trip on startup."},{"question":"What is the breaking capacity of 5SY4320-8CC?","answer":"It is rated 10 kA according to EN 60898 at 440 V AC — the maximum fault current it can safely interrupt under that standard."},{"question":"Does 5SY4320-8CC switch the neutral?","answer":"No, neutral conductor switching is not provided. The neutral must be connected separately if the circuit requires it."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4320-8CC","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/5SY4320-8CC 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}}