{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL3320-7MB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL3320-7MB","canonicalUrl":"https://aoctrl.com/siemens/5SL3320-7MB","factsUrl":"https://aoctrl.com/api/mcp/products/5SL3320-7MB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 3-pole, C-curve, 20 A, 400 V AC, 4.5 kA breaking capacity per EN 60898, order code 5SL3320-7MB.","salesMarkdown":"## What it is and what the ratings mean The Siemens 5SL3320-7MB is a 3-pole SENTRON miniature circuit breaker (MCB) with a C-curve trip characteristic, rated 20 A at 400 V AC. The C-curve means it trips between 5 and 10 times rated current — standard for general-purpose loads like lighting, socket outlets, and small motor circuits where moderate inrush is expected. The 4.5 kA breaking capacity per EN 60898 tells you it can safely interrupt a fault current up to that level at 400 V, which covers most residential and light commercial distribution boards. Overvoltage category III confirms it's rated for fixed-installation panels, not just downstream equipment. The IP20 rating (with connected conductors) means it's protected against finger contact but not against moisture — standard for dry indoor enclosures. It's sealable, halogen-free, and silicon-free, which matters if the panel goes into a clean environment or one with sensitive electronics nearby. ## Mounting and integration Occupies 3 modular width units (54 mm) on a DIN rail. Depth is 76 mm, installation depth 70 mm. Mounting position is any — no derating needed for horizontal or upside-down orientation. Accepts supplementary devices (auxiliary switches, shunt trips, alarm contacts) for remote status or emergency shutdown. Rated for pollution degree 2, so it's fine in a typical control cabinet with non-conductive dust. The mechanical service life is 10,000 operating cycles — not a wear item in normal distribution use.","metaTitle":"Siemens 5SL3320-7MB SENTRON MCB, 3P C 20A 4.5kA","metaDescription":"Siemens 5SL3320-7MB SENTRON 3-pole MCB, 20 A, C-curve, 4.5 kA per EN 60898, 400 V AC. Active production, sourced to order. Request a quote for current pricing and availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SL3320-7MB","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 4.5 kA, 3-pole, C, 20 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","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","Energy Limitation Class":"3","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"3","Tripping Characteristic Class":"C","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"4.5 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 (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.7 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/010ab69b4a33428400e25c9b73a78aac.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=311273&mlfb=5SL3320-7MB"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL3320-7MB?","answer":"Rated 4.5 kA according to EN 60898 at 400 V AC. That's the standard breaking capacity for this series — adequate for residential and light commercial distribution boards where the prospective fault current is under that threshold."},{"question":"Will the 5SL3320-7MB drop into a panel specified for the 5SL4363-7?","answer":"Physically yes — same 3-pole DIN-rail footprint, same 54 mm width, same 76 mm depth, same 70 mm installation depth. The difference is breaking capacity: the 5SL4363-7 is rated 10 kA per both EN 60898 and IEC 60947-2, while this unit is 4.5 kA per EN 60898. If the panel's fault-current study calls for 10 kA, this unit won't meet it."},{"question":"Where can I buy the 5SL3320-7MB and get current pricing?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote — availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL3320-7MB","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/5SL3320-7MB 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}}