{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6120-7BB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6120-7BB","canonicalUrl":"https://aoctrl.com/siemens/5SL6120-7BB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6120-7BB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL6120-7BB, 1-pole miniature circuit breaker, C characteristic, 20 A rated, 6 kA breaking capacity per EN 60898, 250/440 V AC.","salesMarkdown":"The Siemens 5SL6120-7BB is a SENTRON miniature circuit breaker (MCB) — a 1-pole, C-curve device rated 20 A at 30 °C, with a 6 kA breaking capacity certified to both EN 60898 and IEC 60947-2. Single-phase operation is rated 250 V AC; multi-phase (line-to-line) goes up to 440 V AC. That covers standard North American 120/240 V split-phase panels and European 230/400 V three-phase distribution boards. ## Where it fits — panel and environment Width is 18 mm — one modular unit on a standard DIN rail. Depth is 76 mm (70 mm installation depth), so it sits flush in a shallow enclosure without crowding the wiring gutter. Mounting position is unrestricted; you can lay the panel on its back for commissioning without worrying about orientation. Pollution degree 2 (normal, non-conductive) and overvoltage category III (distribution-level) are standard for residential and light commercial infrastructure. ## Thermal derating — the real-world current At 40 °C it derates to 18.48 A, at 45 °C to 17.6 A, and at 55 °C to 15.92 A.","metaTitle":"Siemens 5SL6120-7BB SENTRON MCB, 1P C-curve 20 A, 6 kA","metaDescription":"Siemens 5SL6120-7BB SENTRON miniature circuit breaker, 1-pole, C characteristic, 20 A rated, 6 kA breaking capacity per EN 60898. Current production. Quoted 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":"5SL6120-7BB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230/400 V 6kA, 1-pole C, 20 A Version Italy","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"1","Type Of Voltage":"AC","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"20 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Number Of Poles / Note":"1P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 30 °C / rated value":"20 A","at 40 °C / rated value":"18.48 A","at 45 °C / rated value":"17.6 A","at 55 °C / rated value":"15.92 A","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"6 kA","acc. to IEC 60947-2 / rated value":"6 kA","Product Feature / Touch Protection":"Yes","supply voltage / at AC / rated value":"400 V","Influence Of The Surrounding Temperature":"Periodically +55°C, max. 95% humidity","with multi-phase operation / at AC / maximum":"440 V","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"250 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e5562d13cec3f78d16b1ae750ea4f1d0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=302607&mlfb=5SL6120-7BB"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL6120-7BB?","answer":"Rated 6 kA per both EN 60898 and IEC 60947-2, which covers most residential and light commercial fault levels."},{"question":"Will the 5SL6120-7BB drop into a panel specified for a 5SL6132-6MB?","answer":"Both are 1-pole SENTRON MCBs on an 18 mm footprint, so the physical fit is the same. The difference is rating: the 5SL6120-7BB is a 20 A C-curve, while the 5SL6132-6MB is a 32 A B-curve. No rewiring needed if the load current and trip characteristic match the circuit design."},{"question":"Where can I buy the 5SL6120-7BB?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an inquiry for a firm quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6120-7BB","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/5SL6120-7BB 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}}