{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8350-8BB08","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8350-8BB08","canonicalUrl":"https://aoctrl.com/siemens/5SY8350-8BB08","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8350-8BB08","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, miniature circuit breaker, 3-pole, 50 A, D tripping characteristic, 20 kA at 400 V AC per IEC 60947-2, only magnetic tripping, depth 76 mm, width 54 mm, height 90 mm.","salesMarkdown":"The Siemens 5SY8350-8BB08 is a 3-pole miniature circuit breaker (MCB) from the SENTRON series, rated 50 A with a D tripping characteristic and a 20 kA breaking capacity at 400 V AC per IEC 60947-2. This is a magnetic-only (no thermal trip) design — it reacts to short-circuit currents only, not to sustained overloads. For a 50 A breaker, that trip band starts at 500 A. In a 400 V panel with a transformer kVA rating that could deliver a 20 kA bolted fault, this breaker clears it. The UL 1077 / CSA C22.2 No.235 rating is 5 kA — lower because the North American standard uses a different test circuit and assumes a higher source impedance. Rated operational voltage: 440 V AC for single-phase or multi-phase operation, maximum 72 V DC. The DC rating is low — this is primarily an AC breaker. For DC circuits above 72 V, look for a DC-rated MCB. Snap-on DIN rail mount, any orientation. The quick-assembly fastening system means it clips into place without tools and can be removed with a screwdriver push on the release tab. The combined terminal at top and bottom accepts both busbar and conductor — no separate feed-through lug needed. Touch protection is built into the terminal design — fingers cannot contact live parts when conductors are connected.","metaTitle":"Siemens 5SY8350-8BB08 SENTRON MCB, 3P, 50A, D Curve, 20kA","metaDescription":"Siemens 5SY8350-8BB08 SENTRON miniature circuit breaker, 3-pole, 50 A, D tripping characteristic, 20 kA at 400 V AC per IEC 60947-2. Current 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":"54 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","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","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"50 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"Only magnetic tripping operation","acc. to DIN EN 61346-2":"F","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"3","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"20 kA","Product Feature / Touch Protection":"Yes","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 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 Component / Neutral Conductor Switching":"No","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 (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/21a68aa71e76eeadea522b6c5c69e2e6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=247241&mlfb=5SY8350-8BB08","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY8350-8BB08/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 5SY8350-8BB08?","answer":"The 5SY4301-7CV is a 3-pole, D-curve MCB but at a lower current rating and breaking capacity. It does not drop into the same panel without re-evaluating the circuit's fault current and load requirements — the 5SY8350-8BB08 carries a higher 50 A rating and 20 kA breaking capacity that the 5SY4301-7CV cannot match."},{"question":"What compliance documentation does Siemens provide for 5SY8350-8BB08?","answer":"The breaker carries IEC 60947-2 certification (20 kA at 400 V) and UL 1077 / CSA C22.2 No.235 listing (5 kA). It is also rated for overvoltage category III and pollution degree 3. RoHS and REACH declarations are standard with Siemens SENTRON products."},{"question":"Where can I buy 5SY8350-8BB08 and how is it quoted?","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 price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8350-8BB08","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/5SY8350-8BB08 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}}