{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5120-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5120-6","canonicalUrl":"https://aoctrl.com/siemens/5SY5120-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5120-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY5120-6, 1-pole miniature circuit breaker, 20 A rated, B tripping characteristic, 10 kA breaking capacity per IEC/EN 60898-2 and UL1077, 18 mm width.","salesMarkdown":"That dual-standard listing (IEC + UL) is the authority signal: the part is accepted in both European and North American panels, so a BOM freeze across jurisdictions holds on one order code. Single-pole design (1P) with no neutral switching — it breaks only the line conductor, which is the normal arrangement for a 120/240 V branch circuit where the neutral is bonded elsewhere. ## Temperature derating — the real-world current The 20 A rating holds at 35 °C ambient. Above that, the MCB derates: 18.78 A at 40 °C, 18.14 A at 45 °C, 17.48 A at 50 °C, 16.8 A at 55 °C, and 16.08 A at 60 °C. Sealable terminals allow the installer to lock the cover after commissioning, meeting some site security requirements.","metaTitle":"Siemens 5SY5120-6 SENTRON MCB, 20A 1P B-Curve, 10kA","metaDescription":"Siemens 5SY5120-6 SENTRON miniature circuit breaker, 20A rated, 1-pole, B characteristic, 10kA breaking capacity per IEC/EN 60898-2 and UL1077. Current lifecycle stage. Sourced to","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":"5SY5120-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-2, UL1077","description":"Circuit breaker Universal current 220 V DC 230/400 V AC 10kA, 1-pole, B, 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","at DC / rated value":"220 V","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Energy Limitation Class":"3","according to EN 61346-2":"F","at 35 °C / rated value":"20 A","at 40 °C / rated value":"18.78 A","at 45 °C / rated value":"18.14 A","at 50 °C / rated value":"17.48 A","at 55 °C / rated value":"16.8 A","at 60 °C / rated value":"16.08 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"universal current","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Tripping Characteristic Class":"B","Position / Of Power Supply Cord":"AC as required, observe DC polarity","at DC / according to EN 60898-2":"10 kA","according to EN 60898 / rated value":"10 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/DC","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","at DC / according to IEC 60947-2 / rated value":"15 kA","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"250 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/4c100401adcbf2ea26d552bdf325a47f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=67823&mlfb=5SY5120-6"},"ai":{"faq":[{"question":"Where can I buy 5SY5120-6 and how do I get a price?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"Will 5SY5120-6 drop into a panel that was specified around 5SY4116-6CC without rewiring?","answer":"Yes — both are 1-pole, 18 mm wide MCBs on the same DIN-rail footprint. The 5SY5120-6 is 20 A B-curve versus the 5SY4116-6CC's 16 A C-curve, so the mechanical fit is identical; only the rating and trip characteristic differ."},{"question":"What compliance documentation does this brand provide for 5SY5120-6?","answer":"The part carries IEC/EN 60898-2 and UL1077 certifications. Housing materials are halogen-free and silicon-free. The manufacturer provides standard declaration of conformity and RoHS/REACH documentation upon request through the supply channel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5120-6","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/5SY5120-6 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}}