{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8340-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8340-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8340-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8340-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8340-7, 3-pole miniature circuit breaker, C-characteristic, 25 kA breaking capacity per IEC 60947-2, 400 V AC, 60 V DC, IP20, 76 mm depth.","salesMarkdown":"The Siemens 5SY8340-7 is a SENTRON miniature circuit breaker in a 3-pole configuration with a C-tripping characteristic, designed for branch-circuit protection in industrial control panels. Its 25 kA rated breaking capacity at 400 V AC per IEC 60947-2 means it can safely interrupt a fault current up to that level without upstream fuses needing to clear — a key selectivity consideration when coordinating with a main breaker or switchgear. The C-curve (magnetic trip between 5× and 10× In) suits motor and transformer loads where inrush is moderate, typical for mechanical engineering and industrial applications. ## Standards & Compliance Rated per IEC / EN 60947-2 and UL1077, the 5SY8340-7 carries a 25 kA interrupting rating at 400 V AC (IEC) and 5 kA per UL 1077 / CSA C22.2 No. 235. At DC it is rated 15 kA at 60 V, with a maximum operating voltage of 72 V DC. The enclosure is IP20 with connected conductors — suitable for enclosed panel mounting, not for wet or outdoor locations without a secondary enclosure. The part is halogen-free and silicon-free, which matters for sensitive environments like data centers or clean rooms where outgassing can affect contacts or optics. ## Mounting & Dimensions Snap-on mounting to DIN rail via the quick assembly system; mounting position is any, which simplifies panel layout. The 54 mm width (3 modular units) and 76 mm depth fit standard distribution boards. Combined terminals top and bottom accept copper conductors without neutral switching — the neutral bar stays continuous through the breaker. Installation depth of 70 mm leaves clearance for wiring behind the rail.","metaTitle":"Siemens 5SY8340-7 SENTRON MCB, 3P C-Characteristic, 25 kA IE","metaDescription":"Siemens 5SY8340-7 SENTRON miniature circuit breaker, 3-pole, C-curve, 25 kA breaking capacity per IEC 60947-2, UL1077 listed. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SY8340-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V D=70 mm 25 kA according to EN 60947-2, 3P, C40","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","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":"3","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"C","according to IEC 60947-2 rated value":"25 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":"3.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$78.74","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/25a7d87ade1f264ef4420868d4d9f2a9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=206708&mlfb=5SY8340-7"},"ai":{"faq":[{"question":"Where can I buy 5SY8340-7 and how do I get a price?","answer":"The 5SY8340-7 is sourced and quoted to order against an RFQ. Submit a request for quote through this listing; availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of 5SY8340-7 at 400 V AC?","answer":"The 5SY8340-7 is rated 25 kA at 400 V AC per IEC 60947-2, and 5 kA at 400 V AC per UL 1077 / CSA C22.2 No. 235."},{"question":"What compliance documentation does Siemens provide for 5SY8340-7?","answer":"The 5SY8340-7 is certified to IEC / EN 60947-2 and UL1077. It is halogen-free and silicon-free, meeting common RoHS/REACH requirements for industrial and data-center environments."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8340-7","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/5SY8340-7 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}}