{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4320-5","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4320-5","canonicalUrl":"https://aoctrl.com/siemens/5SY4320-5","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4320-5","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4320-5, 3-pole miniature circuit breaker, 20 A, tripping characteristic A, 10 kA per EN 60898-1 / 20 kA per IEC 60947-2, 3 MW units, IP20.","salesMarkdown":"## Rated current and breaking capacity — what they mean for panel fit At 35 °C the breaker carries its full 20 A rating; at 40 °C it derates to 19.04 A, at 50 °C to 18.04 A, and at 60 °C to 16.96 A — the full derating table is listed for panel builders calculating fill factor in a warm enclosure. Operating ambient range is -40 °C to 75 °C, with humidity limits of 95% up to 55 °C, tapering to 35% at 75 °C — this covers most indoor industrial and outdoor cabinet installations. The 5SY4320-5 is certified to IEC / EN 60898-1 and IEC / EN 60947-2, plus UL1077 — the UL1077 listing means it is accepted as a supplementary protector in North American panels, not a branch-circuit rated device under UL 489. Snap-on DIN rail mount, 3 modular width units (54 mm wide), 76 mm depth, 90 mm height — fits standard 35 mm DIN rail enclosures; the quick-assembly system allows ganging without tools.","metaTitle":"Siemens 5SY4320-5 SENTRON 3-Pole MCB, 20 A, Char. A","metaDescription":"Siemens 5SY4320-5 SENTRON 3-pole miniature circuit breaker, 20 A rated, tripping characteristic A, 10 kA (EN 60898) / 20 kA (IEC 60947-2) breaking capacity.","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":"5SY4320-5","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, A, 20A, 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":"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":"19.04 A","at 45 °C rated value":"18.54 A","at 50 °C rated value":"18.04 A","at 55 °C rated value":"17.5 A","at 60 °C rated value":"16.96 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":"A","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"20 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 (Switching 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":"2.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$239.63","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ce6d3f96bd7332b437cde384381ad6dc.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=520860&mlfb=5SY4320-5"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4320-5","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/5SY4320-5 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}}