{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4108-7CV","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4108-7CV","canonicalUrl":"https://aoctrl.com/siemens/5SY4108-7CV","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4108-7CV","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SY4108-7CV, 1-pole miniature circuit breaker, C-characteristic, 8 A rated current, 15 kA breaking capacity per IEC 60947-2, 18 mm width.","salesMarkdown":"The Siemens 5SY4108-7CV is a 1-pole miniature circuit breaker with a C tripping characteristic, rated 8 A at AC and a breaking capacity of 15 kA per IEC 60947-2. The 18 mm width (1 modular unit) and 76 mm depth fit standard DIN-rail enclosures. IP20 protection applies with conductors connected — the terminals are finger-safe only when wired; the front sealable cover allows a lockout tagout hasp for isolation verification. ## Thermal derating and ambient limits The 8 A rating holds at 35 °C ambient. At 40 °C it derates to 7.11 A, at 45 °C to 6.62 A, at 50 °C to 6.1 A, and at 55 °C to 5.53 A. The maximum ambient is 75 °C, minimum -40 °C, and the surrounding humidity limits are 95% RH up to 55 °C, 55% RH up to 70 °C, and 35% RH up to 75 °C. ## Integration notes The 5SY4108-7CV accepts combined terminals on both top and bottom, so busbar feed-through or daisy-chaining to adjacent breakers is straightforward. Neutral conductor switching is not provided — this is a 1-pole line-side only device. Rated for mechanical engineering and general industry use per the suitability field. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — adequate for machine-mounted enclosures on conveyors or pumps.","metaTitle":"Siemens 5SY4108-7CV MCB, 1P C-Char 8A 15kA IEC 60947-2","metaDescription":"Siemens 5SY4108-7CV miniature circuit breaker, 1-pole C-curve 8A, 15kA breaking capacity per IEC 60947-2. 18mm wide, IP20. Active production. Quoted 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","Standard":"IEC / EN 60947-2","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 AC rated value":"8 A","Installation Depth":"70 mm","Degree Of Pollution":"3","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","at 35 °C rated value":"8 A","at 40 °C rated value":"7.11 A","at 45 °C rated value":"6.62 A","at 50 °C rated value":"6.1 A","at 55 °C rated value":"5.53 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"C","Supply Voltage Frequency Rated Value":"50/60 Hz","according to IEC 60947-2 rated value":"15 kA","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":"AC","operating voltage at DC rated value maximum":"72 V","with single-phase operation at AC rated value":"250 V","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.1 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1531869&mlfb=5SY4108-7CV","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4108-7CV/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY4108-7CV?","answer":"This part is 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 price and lead-time estimate."},{"question":"Will 5SY4108-7CV drop into a panel specified around 5SY4106-7CV without rewiring?","answer":"Yes, the 5SY4108-7CV shares the same 18 mm width, 76 mm depth, 1-pole form factor, and C-curve as the 5SY4106-7CV. The difference is the rated current: 8 A versus 6 A. If the circuit load is under 6 A, the 5SY4106-7CV is the correct fit; above 6 A and up to 8 A, the 5SY4108-7CV drops in without any panel or wiring change."},{"question":"What compliance documentation does this brand provide for 5SY4108-7CV?","answer":"The breaker is certified to IEC / EN 60947-2. It is halogen-free and silicon-free. The manufacturer typically provides a declaration of conformity and CE marking; specific documentation (RoHS, REACH, UL) should be requested at quote time to confirm current status for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4108-7CV","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/5SY4108-7CV 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}}