{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7550-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7550-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7550-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7550-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7 series, 5SY7550-8 miniature circuit breaker, 2-pole (1P+N), 50 A rated current, D tripping characteristic, 15 kA breaking capacity per IEC 60898 / IEC 60947-2, 230 V AC rated voltage, 36 mm width.","salesMarkdown":"## 50 A D-curve MCB for industrial branch circuits The Siemens 5SY7550-8 is a 2-pole (1P+N) miniature circuit breaker from the SENTRON 5SY7 series, rated at 50 A with a D tripping characteristic. ## DIN-rail footprint and terminal capacity The 5SY7550-8 occupies 36 mm width (2 width units) on the DIN rail, with a depth of 76 mm and height of 90 mm. Installation depth is 70 mm — account for this when planning gland-plate clearance and door swing in the enclosure. The terminals are sealable and touch-protected, meeting the requirements for panel builders who need to lock out unauthorized access after commissioning. ## Environmental range and compliance Ambient temperature range spans -40 °C to +75 °C, with humidity limits of 95% at 55 °C, derating to 35% at 75 °C. This covers unheated outdoor cabinets in cold climates as well as warm switchgear rooms. The part is classified per DIN EN 61346-2 and DIN EN 81346-2 as function F (protective device).","metaTitle":"Siemens 5SY7550-8 SENTRON MCB, 2-pole 50A D-curve, 15kA","metaDescription":"Siemens 5SY7550-8 SENTRON miniature circuit breaker, 2-pole 1P+N, 50A rated current, D tripping characteristic, 15kA breaking capacity per IEC 60898/60947-2. Active production, sou","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","Wertebereich":"-40 ... +70 °C","Mounting type":"Quick assembly system","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 ... +75 °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":"5SY7","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":"15 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":"https://cdn.aoctrl.com/6c2dbd24fd226856162fdc085d43c3f7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=83046&mlfb=5SY7550-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7550-8/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7550-8?","answer":"The 5SY7550-8 has a 15 kA breaking capacity per IEC 60898 and IEC 60947-2 at 230 V AC. For UL 1077 / CSA C22.2 No. 235 applications, the rating is 5 kA."},{"question":"What is the closest functional second-source to 5SY7550-8?","answer":"Within the same SENTRON family, the 5SY7140-8CC is a 2-pole 40 A D-curve MCB with the same 15 kA breaking capacity and identical DIN footprint. The 5SY7550-8 is the 50 A step up. Both share the same terminal range, mounting, and environmental specs, so a panel designed for one can accept the other without rewiring — only the overcurrent protection rating changes."},{"question":"Will 5SY7550-8 drop into a panel specified around 5SY7140-8CC without rewiring?","answer":"Yes. Both breakers share the same 36 mm width, 76 mm depth, 90 mm height, DIN-rail mounting, and combined terminal design accepting 0.75–35 mm² conductors. The swap is mechanical and electrical — only the 50 A vs 40 A rating changes."},{"question":"What compliance documentation does Siemens provide for 5SY7550-8?","answer":"The breaker carries ratings per IEC 60898, IEC 60947-2, UL 1077, and CSA C22.2 No. 235. It is halogen-free and silicon-free. Standard Siemens declarations of conformity (CE, UKCA) and RoHS/REACH documentation are available through the manufacturer."},{"question":"How do I get current pricing and availability for 5SY7550-8?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7550-8","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/5SY7550-8 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}}