{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4120-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4120-6","canonicalUrl":"https://aoctrl.com/siemens/5SY4120-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4120-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4120-6, 1-pole B-curve miniature circuit breaker, 10 kA (EN 60898-1) / 20 kA (IEC 60947-2), 400 VAC, 18 mm wide, IP20.","salesMarkdown":"Rated breaking capacity is 10 kA per IEC/EN 60898-1 and 20 kA per IEC 60947-2, with a further 15 kA at DC (60 V per pole) per IEC 60947-2. That dual rating means it meets the higher fault-current demands of industrial panel coordination (60947-2) while also qualifying for residential and commercial final circuits under 60898-1. Depth is 76 mm (70 mm installation depth), so it sits flush with standard distribution board covers. The IP20 rating applies with conductors connected — expected for a panel-mount device. ## Certifications and compliance Certified to IEC/EN 60898-1 and IEC/EN 60947-2, with additional UL 1077 and CSA C22.2 No. 235 recognition (5 kA at AC). The housing is sealable — a feature for panel builders who need to lock out adjustment after commissioning. ## Environmental range Operates from -40 °C to 75 °C ambient, with humidity derating: 95% RH up to 55 °C, 55% RH to 70 °C, and 35% RH to 75 °C. That -40 °C floor is relevant for unheated enclosures in cold climates or refrigerated areas.","metaTitle":"Siemens 5SY4120-6 SENTRON MCB, 1P B-Curve, 10kA/20kA","metaDescription":"Siemens 5SY4120-6 SENTRON miniature circuit breaker, 1-pole B-curve, 10 kA per EN 60898-1 / 20 kA per IEC 60947-2. Active production, sourced to order. Request quote.","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":"5SY4120-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 230/400 V 10kA, 1-pole, B, 20 A, D=70 mm","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","Energy Limitation Class":"3","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":"B","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"20 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":"2.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$71.15","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/858e794944a2930dd911fe7123cbffe3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=7578&mlfb=5SY4120-6"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4120-6?","answer":"Rated 10 kA per IEC/EN 60898-1 and 20 kA per IEC 60947-2 at 400 VAC. At DC (60 V per pole) it is rated 15 kA per IEC 60947-2. For UL 1077 applications it carries a 5 kA rating."},{"question":"What certifications does the 5SY4120-6 carry?","answer":"Certified to IEC/EN 60898-1 and IEC/EN 60947-2, with UL 1077 and CSA C22.2 No. 235 recognition. The housing is halogen-free and silicon-free."},{"question":"What is the physical size of 5SY4120-6?","answer":"Width 18 mm (1 modular unit), depth 76 mm (70 mm installation depth), height 90 mm. It mounts on DIN rail in any position."},{"question":"Where can I buy 5SY4120-6 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit a request for a firm quotation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4120-6","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/5SY4120-6 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}}