{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5125-6CC12","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5125-6CC12","canonicalUrl":"https://aoctrl.com/siemens/5SY5125-6CC12","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5125-6CC12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY5 series, miniature circuit breaker, 1-pole B-curve 25 A, 220 V DC, 10 kA breaking capacity.","salesMarkdown":"## DC-rated miniature circuit breaker, 1-pole B25 The Siemens 5SY5125-6CC12 is a 1-pole miniature circuit breaker from the 5SY5 series, rated 25 A with a B tripping curve. It is specifically rated for 220 V DC applications with a 10 kA breaking capacity — the DC rating is what distinguishes this unit from standard AC-only MCBs, making it suitable for DC distribution panels, UPS outputs, or photovoltaic combiner boxes where fault clearing under DC arc conditions requires a different contact geometry and arc chute design. ## DC arc extinction and coordination The 10 kA breaking capacity at 220 V DC is the headline figure — DC arcs do not self-extinguish at voltage zero crossings like AC, so the internal arc chute and contact material are engineered for sustained DC interruption. In a panel environment, this means the breaker can safely clear a bolted fault on a 220 V DC bus without welding contacts or cascading failure upstream. The B-curve (3-5× In magnetic trip) provides fast short-circuit response while tolerating moderate inrush from capacitive DC loads. ## Panel integration Snap-on mounting to standard 35 mm DIN rail per EN 60715. The 1-pole module occupies one 18 mm width unit. Wire terminals accept 0.75–25 mm² conductors (solid or stranded) with a box lug termination. Busbar comb slots are compatible with Siemens 5ST3 series pin busbars for grouped incoming supply.","metaTitle":"Siemens 5SY5125-6CC12 MCB, 1P B25, 220V DC, 10kA","metaDescription":"Siemens 5SY5125-6CC12 miniature circuit breaker, 1-pole B-curve 25A, rated 220V DC with 10kA breaking capacity. 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":"5SY5125-6CC12","description":"MCB 5SY5 CRH 220V DC 10KA 1P B25","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/88912fb3c86a01c824f1dbbe23b4c31e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1265748&mlfb=5SY5125-6CC12"},"ai":{"faq":[{"question":"What is 5SY5125-6CC12's DC rating and breaking capacity?","answer":"It is rated 25 A, B-curve, 220 V DC with a 10 kA breaking capacity, making it suitable for DC distribution boards and photovoltaic applications."},{"question":"Where can I buy 5SY5125-6CC12?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels, with 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/5SY5125-6CC12","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/5SY5125-6CC12 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}}