{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4620-8CV","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4620-8CV","canonicalUrl":"https://aoctrl.com/siemens/5SY4620-8CV","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4620-8CV","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY4620-8CV, 4-pole miniature circuit breaker, D characteristic, 20 A rated current, 15 kA breaking capacity per IEC 60947-2, 4 modular width units.","salesMarkdown":"The 5SY4620-8CV is a 4-pole miniature circuit breaker with a D tripping characteristic, rated 20 A at 35 °C and carrying a 15 kA breaking capacity per IEC 60947-2. The 4-pole design with switched neutral (3+N) suits three-phase four-wire systems where you need to break all live conductors on a fault. Mounting position is unrestricted, and the quick-assembly system speeds rail installation. The 15 kA breaking capacity at 440 V AC (multi-phase) per IEC 60947-2 is the key selectivity number. In a panel with a 25 kA prospective short-circuit current, you'd need a current-limiting upstream device — this breaker alone won't clear that. The D curve's magnetic trip at 10–20× In (200–400 A for the 20 A frame) is what makes it the go-to for motor branch circuits; a 7.5 kW motor on a 20 A D-curve MCB holds the start and trips on a locked-rotor event. Temperature derating matters in a warm panel. At 35 °C it's a full 20 A; at 40 °C it drops to 18.54 A, at 50 °C to 16.9 A, and at 55 °C to 16.08 A. If your panel ambient hits 50 °C, that 20 A breaker is effectively a 17 A device — size up if the continuous load is near the nameplate. The humidity limits follow a similar curve: max 95% RH up to 55 °C, then derating to 35% at 75 °C. The vibration resistance (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz per IEC 60068-2-6) covers the typical shake on a machine-mounted panel. The breaker is certified to IEC / EN 60947-2, the standard for low-voltage switchgear and controlgear. The functional designation per IEC 81346-2 and EN 61346-2 is F — protective device. This is the same compliance package the brand provides for the entire 5SY series; no separate UL or CSA listing is stated in the spec record.","metaTitle":"5SY4620-8CV 4P MCB, D Curve, 20 A, 15 kA IEC 60947-2","metaDescription":"5SY4620-8CV 4-pole MCB with D tripping characteristic, 20 A rated, 15 kA breaking capacity per IEC 60947-2. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY4620-8CV","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2","description":"MCB Icu=15KA 400V 3P+N D20","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3+N","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"20 A","Installation Depth":"70 mm","Degree Of Pollution":"3","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":"18.54 A","at 45 °C rated value":"17.76 A","at 50 °C rated value":"16.9 A","at 55 °C rated value":"16.08 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":"Yes","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","Supply Voltage Frequency Rated Value":"50/60 Hz","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","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Switching 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/d73a2bece24277a1abfd2f05ba475b5b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1531703&mlfb=5SY4620-8CV"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY4620-8CV?","answer":"This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm number."},{"question":"What is 5SY4620-8CV's listed depth (76 mm) on this component line?","answer":"The overall depth is 76 mm, with an installation depth of 70 mm into the panel."},{"question":"What is 5SY4620-8CV's listed width (72 mm) on this component line?","answer":"The width is 72 mm, which corresponds to 4 modular width units on a standard DIN rail."},{"question":"Will 5SY4620-8CV drop into a panel that was specified around 5SY4332-7CV without rewiring?","answer":"Both are 4-pole DIN-rail MCBs with the same 72 mm width (4 MW), so the mechanical fit is identical. The difference is the tripping characteristic and rating: 5SY4620-8CV is a 20 A D curve; the 5SY4332-7CV is a lower-current C curve. If the panel's branch circuit calls for a 20 A D curve, this is a direct swap. If the original spec was a different rating or curve, the breaker will physically fit but the protection coordination changes."},{"question":"What compliance documentation does this brand provide for 5SY4620-8CV (RoHS, REACH, UL, IEC)?","answer":"The breaker is certified to IEC / EN 60947-2 and carries the halogen-free and silicon-free declarations. No separate UL or CSA listing is stated in the spec record. RoHS and REACH compliance is standard for the brand's current-production 5SY series but is not explicitly listed in this part's spec fields."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4620-8CV","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/5SY4620-8CV 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}}