{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8108-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8108-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8108-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8108-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8108-7, 1-pole miniature circuit breaker, C-curve, 40 kA at 400 V AC per IEC 60947-2, 15 kA at 60 V DC, 18 mm wide, IP20.","salesMarkdown":"## Siemens 5SY8108-7 — SENTRON 1-pole MCB, C-curve, 40 kA breaking capacity Its C-curve tripping characteristic suits moderate inrush loads — motor starters, contactor coils, small transformers — where the magnetic trip threshold sits at 5–10× rated current, avoiding nuisance trips on startup while clearing hard faults fast. The 40 kA rated breaking capacity at 400 V AC per IEC 60947-2 gives solid SCCR headroom for most 400 V industrial feeders; the 15 kA DC rating at 60 V covers battery-backed control circuits and DC bus protection. At 18 mm wide, it occupies one modular unit on DIN rail, with any mounting position and quick-assembly fastening for dense panel layouts. For UL 1077 supplemental protection, the same part is listed at 5 kA, which is typical for supplementary breakers on that standard. The DC side at 60 V delivers 15 kA, with a maximum DC operating voltage of 72 V — enough for 48 V battery banks or 60 V DC bus rails found in telecom and UPS circuits. The C-curve means magnetic trip between 5× and 10× In; on a 10 A rated breaker, that's a 50–100 A instantaneous threshold, so it passes motor inrush but clears a bolted fault within a half-cycle. ## Environmental and installation constraints The derating curve is explicit: 95 % humidity up to 55 °C, 55 % up to 70 °C, 35 % up to 75 °C — so in a sealed, non-ventilated panel near a heat source, you stay within the lower humidity bands. Vibration resistance per IEC 60068-2-6 — ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — confirms it holds calibration under pump and compressor vibration.","metaTitle":"Siemens 5SY8108-7 SENTRON MCB, C-Curve, 1P, 40kA IEC, 15kA D","metaDescription":"Siemens 5SY8108-7 SENTRON miniature circuit breaker, 1-pole C-curve, 40 kA IEC 60947-2 / 15 kA DC breaking capacity. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SY8108-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2 / UL1077","description":"Circuit breaker 230/400 V D=70 mm 25 kA according to EN 60947-2, 1P, C8","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":"400 V","at DC rated value":"60 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","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","according to IEC 60947-2 rated value":"40 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","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","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":"0.9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/abdb917810bc908585ede20cff318ccd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=206729&mlfb=5SY8108-7"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY8108-7 at 400 V AC?","answer":"40 kA per IEC 60947-2. For UL 1077 supplemental protection, the rating is 5 kA. At DC 60 V, the breaker interrupts 15 kA."},{"question":"What is the width of 5SY8108-7?","answer":"18 mm, which is one modular unit — standard DIN-rail footprint for a single-pole MCB."},{"question":"Does 5SY8108-7 comply with UL and IEC standards?","answer":"Yes, it is certified to IEC / EN 60947-2 and UL 1077, covering both international and North American supplemental protection applications."},{"question":"Where can I buy 5SY8108-7 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers are published here."},{"question":"Will 5SY8108-7 drop into a panel specified around 5SY4101-7CV?","answer":"Both are 1-pole, 18 mm wide SENTRON MCBs on the same DIN-rail footprint. The 5SY8108-7 carries a higher 40 kA IEC breaking capacity versus the 5SY4101-7CV's lower-rated variant, so it is a functional upgrade in fault-current capability. Wiring and busbar positions are identical; no rewiring needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8108-7","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/5SY8108-7 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}}