{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7120-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7120-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SY7120-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7120-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7120-8CC, 1-pole miniature circuit breaker, D tripping characteristic, 20 A rated current at AC, 25 kA breaking capacity per IEC 60947-2, 18 mm width.","salesMarkdown":"The Siemens 5SY7120-8CC is a 1-pole SENTRON miniature circuit breaker with a D tripping characteristic, rated 20 A at AC and a breaking capacity of 25 kA per IEC 60947-2. The D-curve means it tolerates inrush currents typical of motor and transformer loads without nuisance tripping; the 20 A rating is the continuous thermal current at 35 °C, derating to 17.78 A at 40 °C and 15.26 A at 50 °C. The 18 mm width and 76 mm depth mean it occupies one module slot; installation depth is 70 mm. ## Thermal derating and environmental limits The 20 A rating holds at 35 °C. Above that, the continuous current must be reduced: 17.78 A at 40 °C, 16.56 A at 45 °C, 15.26 A at 50 °C, 13.82 A at 55 °C (–). Humidity limits apply: max 95% RH up to 55 °C, then 55% RH up to 70 °C, then 35% RH up to 75 °C. ## Selectivity and coordination The D-curve provides magnetic trip at 10–20× In, so it coordinates with upstream SENTRON selective main breakers. Rated frequency is 50/60 Hz. Sealable for lockout/tagout compliance.","metaTitle":"Siemens 5SY7120-8CC SENTRON MCB, 1P D 20A 25kA","metaDescription":"Siemens 5SY7120-8CC SENTRON miniature circuit breaker, 1-pole, D-curve, 20 A rated current, 25 kA breaking capacity per IEC 60947-2. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SY7120-8CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230/400 V 15kA, 1-pole, D, 20A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","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":"20 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","according to EN 61346-2":"F","at 35 °C / rated value":"20 A","at 40 °C / rated value":"17.78 A","at 45 °C / rated value":"16.56 A","at 50 °C / rated value":"15.26 A","at 55 °C / rated value":"13.82 A","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":"1","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","according to IEC 60947-2 / rated value":"25 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","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f505d5f8a1cb38ebdfa7327ea72ee825.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=103890&mlfb=5SY7120-8CC"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7120-8CC?","answer":"25 kA at 440 V AC per IEC 60947-2. This is the maximum fault current it can safely interrupt under standard test conditions."},{"question":"Where can I buy 5SY7120-8CC?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will 5SY7120-8CC fit in a panel designed for 5SY7210-7CC?","answer":"Both are 1-pole SENTRON MCBs in an 18 mm modular width, so the physical footprint is identical. The difference is the tripping characteristic: D-curve on the 5SY7120-8CC versus a different curve on the 5SY7210-7CC. Check the peer's characteristic before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7120-8CC","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/5SY7120-8CC 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}}