{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY3020-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY3020-7","canonicalUrl":"https://aoctrl.com/siemens/5SY3020-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY3020-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY3020-7 miniature circuit breaker, 1+N pole, C-curve 20 A, 4.5 kA breaking capacity at 230 V AC, DIN rail mount, 1 MW width.","salesMarkdown":"The Siemens 5SY3020-7 is a SENTRON miniature circuit breaker (MCB) in a 1+N-pole compact form factor, rated 20 A with a C tripping characteristic and a 4.5 kA breaking capacity per EN 60898 at 230 V AC. This is the part you reach for when you need branch-circuit overcurrent protection in a residential or light-commercial distribution board — the C-curve handles moderate inrush from motorized loads like pumps or compressors without nuisance tripping, while the 4.5 kA SCCR covers typical utility-fault levels in most building installations. The 20 A rating at 30 °C is the headline number for sizing. At 40 °C ambient inside a crowded enclosure, the continuous rating derates to 18.8 A; at 45 °C it drops to 18.2 A. If your load pulls 19 A and the panel runs warm, step up to the next frame — the 5SY3025-7KL at 25 A gives you the thermal headroom without changing the DIN footprint. If your site has a transformer close to the board and the available fault current exceeds that, you need a higher-rated MCB — the SENTRON 5SY6 series (e.g. 5SY6020-7) offers 6 kA in the same 1 MW width. The C-curve trips magnetically between 5× and 10× In, so a 20 A C-curve holds through the 100–200 A inrush spike of a small motor or a bank of LED drivers. For purely resistive loads (heaters, incandescent lighting) a B-curve would be tighter; for heavy transformer or welding loads a D-curve is the better call. One modular width (18 mm,) means it occupies a single pole position in the distribution board. This is a dry-indoor-only part; keep it inside the enclosure, not on the panel door. Halogen-free and silicon-free construction means no corrosive off-gassing in a fire scenario — relevant for hospitals, data centers, or any space with sensitive electronics in the same air path.","metaTitle":"Siemens 5SY3020-7 SENTRON MCB, C-Curve 20 A 4.5 kA 1+N","metaDescription":"Siemens 5SY3020-7 SENTRON miniature circuit breaker, 20 A C-curve, 4.5 kA breaking capacity, 1+N pole, DIN rail mount. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"18 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","lifecycle_stage":"current","Fastening Method":"standard rail","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","Combined Terminal Top":"No","Design Of The Product":"Miniature circuit breaker compact","Energy Limitation Class":"3","at 30 °C / rated value":"20 A","at 40 °C / rated value":"18.8 A","at 45 °C / rated value":"18.2 A","Combined Terminal Bottom":"No","Suitability For Operation":"Residential buildings/infrastructure","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","acc. to EN 60898 / rated value":"4.5 kA","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","Type Of Voltage / Of The Operating Voltage":"AC","vibration resistance / acc. to IEC 60068-2-6":"Yes","insulation voltage (Ui) / at AC / rated value":"250 V","with single-phase operation / at AC / maximum":"250 V","Product Component / Neutral Conductor Switching":"Yes","Mechanical Service Life (Switching Cycles) / Typical":"4 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=466419&mlfb=5SY3020-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY3020-7/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for the 5SY3020-7?","answer":"Within the same SENTRON family, the 5SY3025-7KL is the next step up at 25 A C-curve, same 1+N pole, same 4.5 kA breaking capacity, same 1 MW DIN footprint. It drops into the same panel position without rewiring — the only difference is the higher continuous rating, which gives you thermal headroom if your load is near 20 A and the ambient runs warm."},{"question":"What compliance documentation does Siemens provide for the 5SY3020-7?","answer":"The MCB carries EN 60898 certification for breaking capacity, is rated for overvoltage category III and pollution degree 2, and is halogen-free and silicon-free. Standard Siemens declarations of conformity (CE, UKCA) and material compliance (RoHS, REACH) are available on request with the order documentation."},{"question":"Where can I buy the 5SY3020-7 and how is it quoted?","answer":"The 5SY3020-7 is sourced through independent distribution channels and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no automated stock figures or list prices are published for this channel. Submit an RFQ for a firm quote with lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY3020-7","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/5SY3020-7 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}