{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8650-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8650-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8650-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8650-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8650-8, 4-pole miniature circuit breaker, D tripping characteristic, 50 A rated current (at 45 °C), 20 kA breaking capacity per IEC 60947-2, 400 V AC.","salesMarkdown":"## What this 4-pole D-curve MCB delivers The Siemens 5SY8650-8 is a 4-pole miniature circuit breaker from the SENTRON series, with a D tripping characteristic rated at 50 A at 45 °C and a breaking capacity of 20 kA per IEC 60947-2 at 400 V AC. Rated current is temperature-dependent: 50 A at 45 °C, 48.95 A at 50 °C, and 47.85 A at 55 °C. ## Breaking capacity and compliance across standards The 5SY8650-8 carries three distinct breaking capacity ratings depending on the standard applied: 20 kA per IEC 60947-2 at 400 V AC (the industrial standard), 15 kA per IEC 60947-2 at the DC rating, and 5 kA per UL 1077 and CSA C22.2 No. 235. Vibration resistance per IEC 60068-2-6 is ±1 mm at 5 to 25 Hz and 50 m/s² at 25 to 150 Hz, which covers the mechanical stress of a machine-mounted enclosure. Touch protection is integrated on the terminals. The sealable feature allows a lead seal or lock to be applied to the toggle — useful for lockout/tagout procedures where the breaker must be secured in the off position.","metaTitle":"Siemens 5SY8650-8 SENTRON MCB, 4P D-curve 50A, 20kA","metaDescription":"Siemens 5SY8650-8 SENTRON miniature circuit breaker, 4-pole D-curve, 50A rated at 45°C, 20kA breaking capacity per IEC 60947-2. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","Type Of Voltage":"AC","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"400 V","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"3P+N","acc. to DIN EN 61346-2":"F","at 45 °C / rated value":"50 A","at 50 °C / rated value":"48.95 A","at 55 °C / rated value":"47.85 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"20 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Function / Neutral Conductor Switching":"Yes","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3b6ef566b5dd40a2e574f3d46ee6ac40.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=496518&mlfb=5SY8650-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8650-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY8650-8 and what is the lead time?","answer":"We source the 5SY8650-8 to order against an RFQ. Availability and current pricing are confirmed at quote time through our independent distribution network."},{"question":"What is the breaking capacity of 5SY8650-8 under different standards?","answer":"Per IEC 60947-2 at 400 V AC it is 20 kA; per IEC 60947-2 at DC it is 15 kA; per UL 1077 and CSA C22.2 No. 235 it is 5 kA. The UL/CSA figure is the one to verify for North American panel inspections."},{"question":"Does 5SY8650-8 switch the neutral conductor?","answer":"Yes, the 5SY8650-8 is a 3P+N configuration with neutral conductor switching, meaning the neutral pole is switched along with the three phase poles for full isolation."},{"question":"What compliance documentation does Siemens provide for 5SY8650-8?","answer":"The breaker is rated per IEC 60947-2, UL 1077, and CSA C22.2 No. 235. It carries pollution degree 3, overvoltage category III, and IP20 protection with connected conductors. It is halogen-free and silicon-free. Specific RoHS/REACH declarations are available from Siemens upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8650-8","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/5SY8650-8 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}