{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5120-7CC12","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5120-7CC12","canonicalUrl":"https://aoctrl.com/siemens/5SY5120-7CC12","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5120-7CC12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY5 series, MCB, 220V DC, 10kA, 1-pole, C20 characteristic, order code 5SY5120-7CC12.","salesMarkdown":"The Siemens 5SY5120-7CC12 is a 1-pole miniature circuit breaker (MCB) from the 5SY5 series, rated for 220V DC with a 10kA breaking capacity and a C20 tripping characteristic. This is the part you spec into a DC distribution panel where you need a 20A rated branch protection on a 220V DC bus — common in telecom rectifiers, UPS output cabinets, or battery-backed control circuits. The C-curve means it handles moderate inrush without nuisance trips, so it's a fit for mixed resistive and light inductive DC loads. The 220V DC rating is the key differentiator here — most panel-mount MCBs are AC-only or have a derated DC voltage. This one is purpose-built for DC circuits at the full 220V, so it's safe to interrupt a fault on a 220V battery string or a DC-DC converter output without arc-extinction issues. DC-rated MCBs like this one go into the DC side of industrial power systems: battery chargers, solar combiner boxes, DC motor drives, and control power supplies. The 5SY5 series is Siemens' high-performance DC range, so you'll find it in switchgear that needs a compact, high-interrupting DC branch protector.","metaTitle":"Siemens 5SY5120-7CC12 MCB, 220V DC, 10kA, 1P C20","metaDescription":"Siemens 5SY5120-7CC12 miniature circuit breaker, 220V DC, 10kA breaking capacity, 1-pole C20 curve. Current lifecycle stage. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"title":"5SY5120-7CC12","description":"MCB 5SY5 CRH 220V DC 10KA 1P C20","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b8e18847896543feed7732a4a752dfdb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1265747&mlfb=5SY5120-7CC12"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY5120-7CC12?","answer":"The breaking capacity is 10kA at 220V DC, which means it can safely interrupt a fault current up to 10,000 amps on a 220V DC circuit."},{"question":"Where can I buy 5SY5120-7CC12?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the tripping curve for this MCB?","answer":"It has a C20 characteristic — the C-curve trips between 5 and 10 times rated current, so it handles moderate inrush from small transformers or capacitive loads without nuisance tripping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5120-7CC12","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/5SY5120-7CC12 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}}