{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL1120-7MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL1120-7MB","canonicalUrl":"https://aoctrl.com/siemens/5SL1120-7MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL1120-7MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL1120-7MB, miniature circuit breaker, 1-pole, C-curve, 20 A, 230/400 V AC, 3 kA breaking capacity per IEC 60947-2, 1 MWU (18 mm).","salesMarkdown":"## 20 A, 1-pole, C-curve — what the ratings mean for your panel The Siemens 5SL1120-7MB is a SENTRON miniature circuit breaker rated 20 A, single-pole, with a C tripping characteristic. That C-curve means it trips at 5 to 10 times rated current — designed for moderate inrush loads like small motors, lighting banks, and control transformers where a B-curve would nuisance-trip. The 3 kA breaking capacity per IEC 60947-2 tells you it can safely interrupt a fault up to 3 kA at 230/400 V AC without welding contacts or cascading upstream. For residential and light commercial distribution boards this is the standard interrupting rating; if your fault current exceeds 3 kA, step up to the 6 kA or 10 kA variants in the same family. ## DIN-rail footprint and panel fit Occupies 1 modular width unit (18 mm) on a standard DIN rail — installs in any position. Depth is 76 mm, height 90 mm, installation depth 70 mm. The IP20 rating (with connected conductors) is typical for enclosed distribution boards; no special sealing needed. Sealable design allows locking the toggle in the OFF position for lockout/tagout. Halogen-free and silicon-free construction matters if the panel is in a clean room or oxygen-enriched environment.","metaTitle":"Siemens 5SL1120-7MB SENTRON MCB, 20A 1P C-Curve, 3kA","metaDescription":"Siemens 5SL1120-7MB SENTRON miniature circuit breaker, 20 A, 1-pole, C-curve, 3 kA breaking capacity per IEC 60947-2. Active production. Sourced 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":"5SL1120-7MB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400V 3kA, 1pole, C, 20A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","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":"III","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","supply voltage at AC rated value":"230 V","according to IEC 60947-2 rated value":"3 kA","Type Of Voltage Of The Operating Voltage":"AC","with multi-phase operation at AC maximum":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"253 V","Mechanical Service Life (Operating Cycles) Typical":"4 000","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3d9f96ab58b39a8de8cc88a68119cba0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1046704&mlfb=5SL1120-7MB"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SL1120-7MB?","answer":"3 kA per IEC 60947-2 at 230/400 V AC. That is the standard interrupting rating for residential and light commercial distribution boards."},{"question":"What is the width of 5SL1120-7MB?","answer":"18 mm, which is 1 modular width unit on a DIN rail."},{"question":"Where can I buy 5SL1120-7MB?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL1120-7MB","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/5SL1120-7MB 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}}