{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7340-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7340-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7340-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7340-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7340-8, 3-pole D-curve miniature circuit breaker, 15 kA (EN 60898) / 20 kA (IEC 60947-2), 400 V AC, 3 MW units, IP20.","salesMarkdown":"The Siemens 5SY7340-8 is a SENTRON miniature circuit breaker with a D tripping characteristic, three poles, and a 15 kA rated breaking capacity per EN 60898-1 (20 kA per IEC 60947-2). The D-curve holds through those surges and clears a hard fault when it counts. Breaking capacity is the headline: 15 kA under EN 60898-1 and 20 kA under IEC 60947-2. That dual rating means it's accepted in panels destined for European (EN) and international (IEC) specs, and it also carries UL 1077 / CSA C22.2 No. 235 recognition at 5 kA — enough for North American supplementary protection. The 400 V AC rated voltage (440 V max multi-phase) covers standard three-phase distribution; The D-curve characteristic is the key selection parameter for motor and inductive loads. It allows short-duration inrush up to 10–20× rated current without tripping, so a pump or compressor starting under load won't drop the line. For the MRO planner: if you're replacing a C-curve that nuisance-tripped on a motor start, this is the swap. Three-pole construction (3 MW units wide, 54 mm) with a 76 mm depth and 90 mm height. ## Compliance and environmental notes Halogen-free and silicon-free construction. Sealable with a lockable cover for lockout/tagout compliance. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — survives the shake of a conveyor line or compressor skid.","metaTitle":"Siemens 5SY7340-8 SENTRON MCB, D-Curve 3-Pole, 15/20 kA","metaDescription":"Siemens 5SY7340-8 SENTRON miniature circuit breaker, D-curve, 3-pole, 15 kA per EN 60898 / 20 kA per IEC 60947-2. Active production, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"54 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","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":"D","according to EN 60898 rated value":"15 kA","according to IEC 60947-2 rated value":"20 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 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=465559&mlfb=5SY7340-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7340-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY7340-8 and get a price?","answer":"The 5SY7340-8 is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 5SY7340-8?","answer":"The 5SY7340-8 is certified to IEC / EN 60898-1 and IEC / EN 60947-2, with UL 1077 and CSA C22.2 No. 235 recognition. It is halogen-free and silicon-free. Standard RoHS and REACH declarations are available from Siemens."},{"question":"What is 5SY7340-8's depth and width for panel layout?","answer":"The 5SY7340-8 has a depth of 76 mm, width of 54 mm (3 modular width units), and height of 90 mm. Installation depth is 70 mm. It mounts on DIN rail via the quick-assembly system."},{"question":"Will 5SY7340-8 drop into a panel specified around 5SY4304-7CV?","answer":"Both are 3-pole SENTRON MCBs on the same DIN-rail footprint (3 MW units, 54 mm wide), so the mechanical fit is identical. The key difference is the tripping curve: 5SY7340-8 is D-curve for high-inrush loads, while 5SY4304-7CV is a different characteristic. Verify the curve matches your load before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7340-8","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/5SY7340-8 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}}