{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL3120-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL3120-7","canonicalUrl":"https://aoctrl.com/siemens/5SL3120-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SL3120-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL3120-7, miniature circuit breaker (MCB), 1-pole, C-curve, 20 A, 4.5 kA per EN 60898, 5 kA per IEC 60947-2, 1-module-width (18 mm).","salesMarkdown":"## Siemens SENTRON 5SL3120-7 — 1-pole C-curve MCB, 20 A The Siemens SENTRON 5SL3120-7 is a 1-pole miniature circuit breaker rated 20 A at 230/400 V AC, with a C tripping characteristic. It breaks 4.5 kA per EN 60898 and 5 kA per IEC 60947-2, covering the standard fault-current range for residential and light-commercial distribution boards. Rated operational voltage is 230/400 V AC single/multi-phase, with a maximum of 440 V AC in multi-phase operation and a supply frequency of 50/60 Hz. Two breaking-capacity ratings are listed: 4.5 kA according to EN 60898 (the standard for household-type MCBs) and 5 kA according to IEC 60947-2 (the industrial standard). The IEC 60947-2 figure governs the part's use in industrial sub-distribution where higher prospective fault currents may be declared on the single-line diagram. Energy limitation class 3 means this MCB limits the let-through energy (I²t) on a downstream fault, which aids selective coordination with upstream devices. Width is 18 mm (1 modular unit), depth 76 mm, height 90 mm, with an installation depth of 70 mm. Sealable terminals (sealable: Yes) allow the installer to lock the cover after commissioning, preventing tamper. ## Thermal derating and ambient limits At 40 °C it derates to 18.79 A; at 45 °C to 18.4 A; at 55 °C to 16.8 A. This matters when the breaker is ganged in a multi-pole assembly or enclosed in a warm cabinet — the actual continuous current the circuit can carry is the derated figure, not the handle rating.","metaTitle":"Siemens SENTRON 5SL3120-7 MCB, 1P C 20A, 4.5kA","metaDescription":"Siemens SENTRON 5SL3120-7 miniature circuit breaker, 1-pole C-curve 20 A, 4.5 kA per EN 60898, 5 kA per IEC 60947-2. Current-production status. Sourced to order against 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":"5SL3120-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230/400 V 4.5 kA, 1-pole, C, 20 A","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","at AC / rated value":"20 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Energy Limitation Class":"3","according to EN 61346-2":"F","at 30 °C / rated value":"20 A","at 40 °C / rated value":"18.79 A","at 45 °C / rated value":"18.4 A","at 55 °C / rated value":"16.8 A","according to IEC 81346-2":"F","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","at DC / rated value / maximum":"72 V","according to EN 60898 / rated value":"4.5 kA","supply voltage / at AC / rated value":"400 V","according to IEC 60947-2 / rated value":"5 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":"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/5f776d91465b99dd2c80a714fc599658.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=470085&mlfb=5SL3120-7"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL3120-7","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/5SL3120-7 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}}