{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8120-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8120-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8120-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8120-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8120-7, 1-pole miniature circuit breaker, C-curve, 30 kA breaking capacity per IEC 60947-2, 5 kA per UL 1077, width 18 mm, depth 76 mm.","salesMarkdown":"The 5 kA rating under UL 1077 is the North American supplementary-protector rating; for UL 489 branch-circuit listing you'd need a different part, but for OEM equipment panels this is the correct standard. The DC side matters if you're breaking battery or rectified supplies: 15 kA at 60 V DC per IEC 60947-2. That's a real advantage over many residential MCBs that have no DC rating at all. The 1-pole design means it switches only the line conductor — neutral is not switched, which is standard for single-phase AC branch circuits. The 10 000 mechanical operating cycles typical service life means it's built for the switching frequency you'd see in a machine tool or conveyor line, not a once-a-year disconnect. At 18 mm wide (1 modular unit), it takes minimal rail space. Depth is 76 mm overall, with 70 mm installation depth — enough clearance for the terminals and wiring behind the panel door. Sealable (padlockable) handle for lockout/tagout compliance. Halogen-free and silicon-free construction avoids corrosive off-gassing in sealed enclosures near sensitive electronics.","metaTitle":"Siemens 5SY8120-7 SENTRON MCB, C-Curve, 1-Pole, 30 kA IEC","metaDescription":"Siemens 5SY8120-7 SENTRON miniature circuit breaker, 1-pole, C-curve, 30 kA IEC 60947-2, 5 kA UL 1077. IP20, -40 to 75°C. Current production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SY8120-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2 / UL1077","description":"Circuit breaker 230/400 V D=70 mm 25 kA according to EN 60947-2, 1P, C20","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","at AC rated value":"400 V","at DC rated value":"60 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"C","according to IEC 60947-2 rated value":"30 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","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.7 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0236a2413e976235e8707b7175aa645b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=388491&mlfb=5SY8120-7"},"ai":{"faq":[{"question":"Will the 5SY8120-7 drop into a panel specified around a 5SY4116-7CV without rewiring?","answer":"Yes — both are 1-pole, 18 mm wide DIN-rail mount MCBs with C-curve trip. The 5SY8120-7 is a direct functional replacement; just verify that its 30 kA IEC breaking capacity meets or exceeds the panel's SCCR requirement."},{"question":"What compliance documentation does Siemens provide for the 5SY8120-7?","answer":"The breaker is certified to IEC/EN 60947-2 and UL 1077. It's halogen-free and silicon-free. Standard Siemens documentation includes the declaration of conformity and UL recognition file; request these with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8120-7","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/5SY8120-7 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}}