{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5203-7CC12","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5203-7CC12","canonicalUrl":"https://aoctrl.com/siemens/5SY5203-7CC12","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5203-7CC12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY5 series, MCB, 2-pole C3, 440V DC, 10kA breaking capacity, order code 5SY5203-7CC12.","salesMarkdown":"## DC-rated miniature circuit breaker for 440 VDC rail protection The Siemens 5SY5203-7CC12 is a 2-pole miniature circuit breaker from the 5SY5 series, rated for 440 V DC with a 10 kA breaking capacity and a C3 trip curve. This is a DC-specific breaker — the 440 V DC rating and 10 kA interrupting capacity are the headline numbers that govern fit for a DC distribution board or photovoltaic combiner box. The C3 curve (trips at 5–10× rated current) suits it for protecting motor circuits or transformer-fed loads where inrush is expected, rather than purely resistive DC loads where a C1 or B curve would be tighter. The 2-pole construction means both poles are switched and protected — common in DC systems where the positive and negative rails each need overcurrent protection, or where a single-pole breaker cannot handle the DC voltage rating alone (series-connected poles increase the DC voltage withstand). Snap-on DIN rail mounting per EN 60715 fits standard 35 mm rail in enclosures or sub-distribution boards.","metaTitle":"Siemens 5SY5203-7CC12 MCB, 2P C3, 440V DC, 10kA","metaDescription":"Siemens 5SY5203-7CC12 MCB, 2-pole C3 curve, 440V DC rated, 10kA breaking capacity. Current lifecycle stage: active. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"title":"5SY5203-7CC12","description":"MCB 5SY5 CRH 440V DC 10KA 2P C3","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/60aaa0172cbe74bd7b9706a0d32bc97a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1265763&mlfb=5SY5203-7CC12"},"ai":{"faq":[{"question":"Where can I buy 5SY5203-7CC12 and get a price?","answer":"The 5SY5203-7CC12 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quotation — submit an RFQ for a firm price and lead time."},{"question":"What is the 5SY5203-7CC12's rated DC voltage and breaking capacity?","answer":"The 5SY5203-7CC12 is rated for 440 V DC with a 10 kA breaking capacity, 2-pole, C3 curve. This means it can safely interrupt DC faults up to 10 kA at 440 VDC."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5203-7CC12","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/5SY5203-7CC12 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}}