{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4550-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4550-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4550-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4550-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4 series miniature circuit breaker, 5SY4550-8, 2-pole (1P+N), 50 A, D tripping characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 230 V AC, IP20.","salesMarkdown":"The Siemens 5SY4550-8 is a 2-pole (1P+N) miniature circuit breaker from the SENTRON 5SY4 family, rated 50 A with a D tripping characteristic. The 76 mm depth leaves clearance in shallow enclosures. Rated voltage is 230 V AC; maximum DC voltage is 72 V, so it works in single-phase AC branch circuits and some DC control circuits. The 10 kA SCCR under EN 60898 is the standard for domestic/commercial distribution; the 15 kA rating under IEC 60947-2 gives you headroom for industrial installations with higher available fault current. Snap-on DIN rail mounting (quick assembly system). Sealable cover is standard — useful for lockout/tagout on the 1P+N pole. Touch protection is built in.","metaTitle":"Siemens 5SY4550-8 SENTRON MCB, 50 A, D Curve, 2-Pole, 10 kA","metaDescription":"Siemens 5SY4550-8 SENTRON miniature circuit breaker, 50 A, D tripping characteristic, 2-pole (1P+N), 10 kA (EN 60898) / 15 kA (IEC 60947-2). Current lifecycle. Sourced to order aga","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","During Storage":"-40 ... +75 °C","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-40 ... +70 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"230 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"2","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY4","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"50 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"15 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","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","Tightening torque / with screw-type terminals":"2.5 ... 3.5 N·m","Product function / neutral conductor switching":"Yes","with single-phase operation / at AC / rated value":"250 V","Mechanical service life (switching cycles) / typical":"10 000","Tightening torque [lbf·in] / with screw-type terminals":"22 ... 31 lbf·in","AWG number / as coded connectable conductor cross section":"18 ... 4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=457261&mlfb=5SY4550-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4550-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY4550-8 and how do I get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote (RFQ) and we will confirm availability and current pricing at that time."},{"question":"Will 5SY4550-8 drop into a panel specified around 5SY6613-8 without rewiring?","answer":"Both are SENTRON MCBs on the same DIN-rail footprint (2 width units, 36 mm), but the 5SY6613-8 is a different rating and characteristic — verify the required current and trip curve before substituting. The mechanical fit is the same; the electrical specification may not be."},{"question":"What compliance documentation does Siemens provide for 5SY4550-8?","answer":"The MCB carries approvals per EN 60898 and IEC 60947-2, plus UL 1077 and CSA C22.2 No.235 (5 kA rating). RoHS and REACH declarations are standard with Siemens industrial products; request them at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4550-8","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/5SY4550-8 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}}