{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5105-7CC12","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5105-7CC12","canonicalUrl":"https://aoctrl.com/siemens/5SY5105-7CC12","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5105-7CC12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY5105-7CC12, 1-pole DC, 0.5A rated at 35°C, C tripping characteristic, 250V DC max, 18mm width, railway design.","salesMarkdown":"## DC rating and thermal derating Rated 0.5 A at 35 °C ambient, the 5SY5105-7CC12 derates to 0.46 A at 40 °C, 0.44 A at 45 °C, 0.42 A at 50 °C, 0.4 A at 55 °C, and 0.38 A at 60 °C. That thermal curve governs the real continuous load in a sealed enclosure — if the panel ambient sits at 50 °C, the breaker can only carry 0.42 A continuously without nuisance tripping. ## Railway certification and environmental tolerance Explicitly designed for railway operation, with a wide ambient range from -40 °C to 75 °C and humidity tolerance up to 95% at 55 °C, 55% at 70 °C, and 35% at 75 °C. IP20 with connected conductors — finger-safe on the front, but the terminals require enclosure protection. ## Mechanical fit and panel integration Depth is 76 mm (70 mm installation depth), height 90 mm. Sealable and halogen-free / silicon-free — no outgassing concerns in sealed enclosures. Combined top and bottom terminals simplify daisy-chaining; note the polarity requirement on the DC supply. Supplementary devices (auxiliary contacts, shunt trip, alarm switch) can be installed on the right side.","metaTitle":"Siemens SENTRON 5SY5105-7CC12 MCB, 0.5A, C-curve, 1P DC, 250","metaDescription":"Siemens SENTRON 5SY5105-7CC12 miniature circuit breaker, 0.5A rated at 35°C, C tripping curve, 1-pole DC 250V max. Railway-certified, IP20, 18mm wide. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at DC rated value":"220 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"For railway applications","at 35 °C rated value":"0.5 A","at 40 °C rated value":"0.46 A","at 45 °C rated value":"0.44 A","at 50 °C rated value":"0.42 A","at 55 °C rated value":"0.4 A","at 60 °C rated value":"0.38 A","according to EN 61346-2":"F","Combined Terminal Bottom":"Yes","Suitability For Operation":"Railway","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"Consider polarity","Tripping Characteristic Class":"C","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage Of The Operating Voltage":"DC","operating voltage at DC rated value maximum":"250 V","vibration resistance according to IEC 60068-2-6":"50 m/s² at 25 to 150 Hz","Product Extension Installable Supplementary Devices":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/515c613936035740ce35c4d7c2507001.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1265735&mlfb=5SY5105-7CC12","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY5105-7CC12/alternatives.json"},"ai":{"faq":[{"question":"Will 5SY5105-7CC12 fit a panel built for 5SY4116-7CV?","answer":"Yes — both are 1-pole, 18 mm wide, DIN-rail mounted MCBs with the same SENTRON footprint. The 5SY5105-7CC12 drops into the same rail slot without rewiring, provided the circuit is rated for 0.5 A DC."},{"question":"What compliance documentation is available for 5SY5105-7CC12?","answer":"The breaker is halogen-free and silicon-free, which supports RoHS and REACH compliance claims. It carries vibration resistance per IEC 60068-2-6 and is designed to EN 61346-2 for railway function coding. For specific UL/IEC certificates, request the manufacturer's declaration at quote time."},{"question":"Where can I buy 5SY5105-7CC12?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5105-7CC12","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/5SY5105-7CC12 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}}