{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL6120-6BB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL6120-6BB","canonicalUrl":"https://aoctrl.com/siemens/5SL6120-6BB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL6120-6BB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL6 series, miniature circuit breaker, 5SL6120-6BB, 1-pole, B-curve, 20 A rated, 6 kA breaking capacity per EN 60898, 400 V AC, 18 mm width.","salesMarkdown":"The Siemens SENTRON 5SL6120-6BB is a 1-pole miniature circuit breaker rated 20 A with a B-curve tripping characteristic, designed for protecting final circuits in residential buildings and infrastructure installations. It breaks fault currents up to 6 kA per EN 60898 and IEC 60947-2, which covers the typical prospective short-circuit current at the service entrance of most residential and light commercial panels. The 18 mm width (one modular unit) drops into any standard DIN-rail enclosure without needing to shuffle adjacent breakers — a straight swap for a failed or undersized 20 A B-curve unit. The B-curve means the magnetic trip activates at 3 to 5 times rated current (60–100 A for this 20 A unit), making it suitable for resistive and lighting loads with modest inrush — think general-purpose sockets, lighting circuits, and small appliances. The 6 kA breaking capacity is the maximum fault current the breaker can safely interrupt at its rated voltage; at 400 V AC this is adequate for most residential and light commercial service entrances, but verify against the available fault current at the point of installation — if your panel's SCCR exceeds 6 kA, you need a higher-rated upstream device or a current-limiting breaker. ## Panel Integration — DIN Rail and Wiring Notes The 18 mm width occupies one modular unit, and the 70 mm installation depth leaves clearance behind a standard 80 mm deep enclosure. Spring-cage terminals accept 0.2–2.5 mm² solid or ferruled stranded wire; strip length is 8 mm. The breaker is sealable for tamper-proof applications, and the halogen-free, silicon-free construction suits installations where outgassing during a fault must be minimized.","metaTitle":"Siemens 5SL6120-6BB SENTRON MCB, 20 A, B-Curve, 1P, 6 kA","metaDescription":"Siemens SENTRON 5SL6120-6BB miniature circuit breaker, 20 A rated, B-curve, 1-pole, 6 kA breaking capacity per EN 60898. Current lifecycle stage, sourced to order via RFQ.","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":"5SL6120-6BB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50 Hz","description":"Miniature circuit breaker 230/400 V 6kA, 1-pole B, 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","Protection class IP":"IP20, with connected conductors","Overvoltage category":"3","Design of the product":"5SL miniature circuit breakers","Energy limiting class":"3","Number of width units":"1","Number of poles / Note":"1P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SL6","Suitability for operation":"Residential buildings/infrastructure","Current / at AC / rated value":"20 A","Tripping characteristic class":"B","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 (switching 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=319810&mlfb=5SL6120-6BB"},"ai":{"faq":[{"question":"Where can I buy 5SL6120-6BB and how do I get a price?","answer":"The 5SL6120-6BB is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"What is 5SL6120-6BB's width and depth for panel planning?","answer":"The 5SL6120-6BB is 18 mm wide (one modular unit) and 76 mm deep, with a 70 mm installation depth behind the DIN rail."},{"question":"Will 5SL6120-6BB drop into a panel specified around 5SL6132-6MB?","answer":"The 5SL6120-6BB shares the same 18 mm width, DIN-rail mounting, and 5SL6-series footprint as the 5SL6132-6MB, so it fits the same panel layout without rewiring — but verify the rated current (20 A vs 32 A) and tripping curve (B vs C) match your circuit requirements."},{"question":"What compliance documentation does Siemens provide for 5SL6120-6BB?","answer":"The 5SL6120-6BB is designed to EN 60898 and IEC 60947-2, carries a 6 kA breaking capacity under both standards, and is halogen-free and silicon-free. For specific RoHS, REACH, or UL documentation, request the manufacturer's declaration of conformity with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL6120-6BB","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/5SL6120-6BB 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}}