{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5240-7CC12","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5240-7CC12","canonicalUrl":"https://aoctrl.com/siemens/5SY5240-7CC12","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5240-7CC12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY5 series MCB, 2-pole C40 curve, 440V DC, 10kA breaking capacity, order code 5SY5240-7CC12.","salesMarkdown":"## What this MCB is and what it does The Siemens 5SY5240-7CC12 is a 2-pole miniature circuit breaker from the 5SY5 series, rated C40 (40 A trip curve C) for 440 V DC circuits with a 10 kA breaking capacity. That 10 kA interrupting rating at 440 V DC means it can safely clear a bolted fault on a DC bus or battery bank without welding its contacts or cascading failure upstream — a real concern on high-energy DC systems where arc extinction is harder than on AC. The C-curve (5–10× In) handles moderate inrush from DC motor drives or solenoid banks without nuisance tripping, while still protecting the branch wiring. ## Where it fits in a panel Snaps onto standard DIN rail inside a control cabinet or distribution board. The 2-pole form factor takes two module widths; plan your busbar and gland-plate fill accordingly. This is a DC-rated breaker, so don't swap it into an AC-only panel expecting the same arc-quenching performance — the DC rating is the one that governs here.","metaTitle":"Siemens 5SY5240-7CC12 MCB, 2P C40, 440V DC, 10kA","metaDescription":"Siemens 5SY5240-7CC12 MCB, 2-pole C40 curve, rated 440V DC with 10kA breaking capacity. Current production stage. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"title":"5SY5240-7CC12","description":"MCB 5SY5 CRH 440V DC 10KA 2P C40","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/87f21501dccddf7ca107dfe093e9adba.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1265784&mlfb=5SY5240-7CC12"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY5240-7CC12?","answer":"Rated 10 kA at 440 V DC, which is the interrupting rating for clearing a fault on the DC side."},{"question":"Where can I buy 5SY5240-7CC12?","answer":"Sourced and quoted to order against an RFQ through independent distribution. 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/5SY5240-7CC12","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/5SY5240-7CC12 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}}