{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4340-5","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4340-5","canonicalUrl":"https://aoctrl.com/siemens/5SY4340-5","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4340-5","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4340-5, 3-pole miniature circuit breaker, 40 A, tripping characteristic A, 10 kA breaking capacity per EN 60898-1, 15 kA per IEC 60947-2, 400 V AC rated voltage.","salesMarkdown":"## Active production, dual-standard breaking capacity The 5SY4340-5: Breaking capacity is specified under three standards: 10 kA per EN 60898-1, 15 kA per IEC 60947-2, and 15 kA at DC per IEC 60947-2. For UL 1077 applications the rating is 5 kA. The 15 kA figure under IEC 60947-2 gives headroom for industrial panel SCCR requirements where the fault current at the board exceeds the residential 10 kA ceiling. Rated operational voltage is 400 V AC (single-phase or multi-phase operation up to 440 V) and 60 V DC (maximum 72 V DC). The 3-pole design switches all three phases simultaneously; neutral conductor switching is not provided. ## Characteristic A tripping, physical fit, and environmental limits Tripping characteristic A provides a narrow magnetic trip window — typically 2 to 3 times rated current — suited for protecting semiconductor circuits or long cable runs where standard B or C curves would allow damaging overcurrents to persist. This is the defining selection parameter for this breaker: if the load is resistive or electronic with low inrush, characteristic A avoids nuisance trips that a C-curve would cause. ## Sourcing and compliance documentation The sealable design (padlockable toggle) supports lockout/tagout procedures required by safety audits. Combined top and bottom terminals simplify daisy-chaining in distribution boards. Sourced to order against RFQ through independent distribution channels. For volume or framework agreements, request a formal quotation specifying the BOM quantity and required delivery window.","metaTitle":"Siemens 5SY4340-5 SENTRON 3-Pole MCB, 40A, Characteristic A","metaDescription":"Siemens 5SY4340-5 SENTRON 3-pole MCB, 40A, characteristic A. Breaking capacity 10 kA per EN 60898-1, 15 kA per IEC 60947-2. 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":"5SY4340-5","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V 10kA, 3-pole, A, 40A, D=70 mm","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":"A","according to EN 60898 rated value":"10 kA","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","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":"3.9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$234.61","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a155e61dfee35baa7a9fe406393aee99.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=280616&mlfb=5SY4340-5"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4340-5","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/5SY4340-5 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}}