{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8114-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8114-8","canonicalUrl":"https://aoctrl.com/siemens/5SY8114-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8114-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8114-8, miniature circuit breaker, 1-pole, D characteristic, 70 kA (IEC 60947-2) / 15 kA DC / 5 kA UL1077, 400 V AC, 50/60 Hz, 1 MW, IP20.","salesMarkdown":"## Siemens 5SY8114-8 — D-Curve MCB for High-Inrush Loads The Siemens 5SY8114-8 is a 1-pole SENTRON miniature circuit breaker with a D tripping characteristic, rated for 400 V AC at 50/60 Hz. It delivers a 70 kA breaking capacity per IEC 60947-2 — the figure that governs fault clearance in industrial panels — and 15 kA DC for DC-side protection. Under UL 1077 it's listed at 5 kA, so it's accepted in North American supplementary protection roles as well. ## What the Ratings Mean for Your Panel The D curve means this breaker is built for loads with high inrush — motor starters, transformers, welding equipment, and DC power supplies. It tolerates a short-duration surge well above its rated current without nuisance tripping, then clears a hard fault at the full 70 kA. That 70 kA interrupting rating per IEC 60947-2 is the key number for panel coordination: it tells you this MCB can safely interrupt a fault up to that level without upstream devices needing to clear it first. Pollution degree 3 (conductive pollution or dry non-conductive with condensation) and overvoltage category III (fixed installation) confirm it's meant for the industrial distribution board, not a residential load center. Rated for ambient operation from -40 °C to 75 °C, with a derating curve above 55 °C (95 % RH at 55 °C, 55 % at 70 °C, 35 % at 75 °C). That matters if you're mounting it near a heat source or in a warm enclosure — the breaker's thermal trip element responds to ambient temperature, so you'll need to account for the reduced continuous current at the higher end of the range. ## Panel Fit and Mounting Occupies 1 modular width unit (18 mm) on a DIN rail. Installation depth is 70 mm; overall depth 76 mm, which includes the terminal projection. Mounting position any, fastening via the quick-assembly system — snaps onto the rail, no tools needed. Combined terminals top and bottom accept the supply from either side, so you can feed the busbar from the top or bottom without extra hardware. Sealable with a lead seal or adhesive label for tamper-proofing in metering or critical circuits. ## Compliance and Documentation Certified to IEC / EN 60947-2 and UL 1077 / CSA C22.2 No. 235. Halogen-free and silicon-free construction — relevant for clean-room or semiconductor-adjacent installations where outgassing must be controlled. Vibration tested per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. Mechanical service life 10 000 operating cycles typical. Supplementary devices (auxiliary switches, shunt trips, alarm contacts) can be installed on the side.","metaTitle":"Siemens 5SY8114-8 SENTRON MCB, D Curve, 1P, 70 kA IEC","metaDescription":"Siemens 5SY8114-8 SENTRON miniature circuit breaker, 1-pole, D tripping characteristic, 70 kA breaking capacity per IEC 60947-2, 400 V AC, 15 kA DC. Active production. Quoted to or","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":"5SY8114-8","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, D0.3","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","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":"D","according to IEC 60947-2 rated value":"70 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","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/751581a6b5c0e42517e90d696adcb4e1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=468653&mlfb=5SY8114-8"},"ai":{"faq":[{"question":"Where can I buy 5SY8114-8 and get a price?","answer":"This part is sourced and quoted to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"Will 5SY8114-8 drop into a panel specified for 5SY4140-7 without rewiring?","answer":"Both are 1-pole, 1-MW (18 mm) SENTRON MCBs on the same DIN-rail footprint with combined terminals. The 5SY8114-8 carries a D curve and 70 kA breaking capacity; the 5SY4140-7 is a different variant. Panel fit is identical — no rewiring needed — but verify the tripping characteristic and interrupting rating match your circuit requirements."},{"question":"What is the depth of 5SY8114-8?","answer":"Overall depth is 76 mm; installation depth (behind the panel face) is 70 mm."},{"question":"What compliance documentation does Siemens provide for 5SY8114-8?","answer":"The MCB is certified to IEC/EN 60947-2 and UL 1077/CSA C22.2 No. 235. It is halogen-free and silicon-free. Standard Siemens documentation includes the declaration of conformity, UL recognition file, and material compliance data (RoHS/REACH) on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8114-8","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/5SY8114-8 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}}