{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4320-7CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4320-7CC","canonicalUrl":"https://aoctrl.com/siemens/5SY4320-7CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4320-7CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4320-7CC miniature circuit breaker, 3-pole, C-curve, 10 kA breaking capacity per EN 60898, 5 kA per UL 1077, 400 V AC, 72 V DC max.","salesMarkdown":"It is rated 400 V AC (440 V max in single- or multi-phase operation) and 72 V DC maximum. The breaking capacity is 10 kA per EN 60898 and 5 kA per UL 1077 / CSA C22.2 No.235 — the UL figure governs installations in North American panels, while the EN figure applies across IEC markets. That split matters when you are coordinating downstream branch protection: the 10 kA IEC rating gives headroom in most European distribution boards, but if your BOM calls for UL 489 or UL 1077 compliance, the 5 kA at 400 V is the limiting number for fault-current calculations. The C-curve (trips at 5–10× rated current) suits general-purpose loads — lighting, small motor circuits, control transformers — where inrush is moderate and nuisance tripping from brief surges is not a concern. For highly inductive loads or long cable runs, verify that the instantaneous trip threshold does not overlap with the starting current profile; the C-curve is the standard choice for most commercial and industrial sub-distribution. It mounts in any position and uses a quick-assembly fastening system — no tools needed for rail snap-in or removal. ## Thermal environment and humidity — not just a number The 5SY4320-7CC is rated for an ambient temperature range of -40 °C to +75 °C, but the humidity derating is explicit: max 95% RH up to 55 °C, then linear down to 55% at 70 °C and 35% at 75 °C. In a hot-strip mill or near a furnace, where the panel interior may sit at 60–65 °C and humidity is high from cooling water, that derating curve matters — the breaker will still function, but the relative humidity cap at elevated temperatures prevents internal condensation and creepage-path degradation. The degree of pollution 3 rating confirms it is designed for conductive-pollution environments (industrial atmospheres with dust, moisture, or chemical deposits), so it holds up in the same panel as large drives without needing a conformal-coat upgrade. ## Panel integration and expandability Combined terminals top and bottom simplify daisy-chaining busbars or ring-tongue lugs. The sealable design lets the panel builder lock the toggle in the ON or OFF position for lockout/tagout compliance without an external hasp. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz, so it holds up on machine-mounted subpanels near vibrating conveyors or mills.","metaTitle":"Siemens 5SY4320-7CC SENTRON MCB, 3P C-Curve, 10 kA","metaDescription":"Siemens 5SY4320-7CC SENTRON miniature circuit breaker, 3-pole C-curve, 10 kA per EN 60898, 5 kA per UL 1077. Active production. Sourced to order.","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":"5SY4320-7CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, C, 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":"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","Energy Limitation Class":"3","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":"C","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":"1.7 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/07d227fd661e4f1aa5cbfd5ef30ea14a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=413971&mlfb=5SY4320-7CC"},"ai":{"faq":[{"question":"Where can I buy 5SY4320-7CC and how do I get a price?","answer":"The 5SY4320-7CC is available to order against an RFQ through our industrial-automation distribution channel. Submit an RFQ for current pricing and lead-time confirmation — no stock figures or firm prices are published here."},{"question":"Will 5SY4320-7CC drop into a panel specified around 5SY4310-7CV without rewiring?","answer":"Yes, the 5SY4320-7CC shares the same 3-pole, 3-modular-width (54 mm) DIN-rail footprint, same depth (76 mm), and same terminal arrangement as the 5SY4310-7CV. No rewiring or busbar repositioning is needed for a direct swap — the difference is the C-curve rating and breaking capacity, not the mechanical interface."},{"question":"What compliance documentation does the 5SY4320-7CC carry?","answer":"The breaker is UL 1077 and CSA C22.2 No.235 listed (5 kA), and tested per EN 60898 (10 kA). It is RoHS, REACH, halogen-free, and silicon-free compliant. The SENTRON series documentation package includes the EC Declaration of Conformity and the manufacturer's test certificates for the cited standards."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4320-7CC","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/5SY4320-7CC 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}}