{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7340-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7340-7","canonicalUrl":"https://aoctrl.com/siemens/5SY7340-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7340-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7340-7, 3-pole miniature circuit breaker, C-curve, 400 V AC, 15 kA (EN 60898-1) / 20 kA (IEC 60947-2), 50/60 Hz.","salesMarkdown":"## SENTRON 5SY7340-7 — 3-pole C-curve MCB for panel and machine builds The Siemens SENTRON 5SY7340-7 is a 3-pole miniature circuit breaker with C-curve tripping characteristic, designed for 400 V AC operation at 50/60 Hz. It carries a dual-rated breaking capacity: 15 kA per EN 60898-1 and 20 kA per IEC 60947-2, with a DC rating of 15 kA at 60 V per IEC 60947-2. At 3 modular width units (54 mm wide, 76 mm deep, 90 mm tall), it occupies the same footprint as a standard 3P MCB — no panel rework needed when replacing an existing unit. The IP20 rating applies with conductors connected, which is the normal installed state inside an enclosure. ## Breaking capacity and selectivity — what the dual rating means for coordination The 15 kA rating under EN 60898-1 is the value used for residential and light commercial coordination per IEC 60364. The 20 kA rating under IEC 60947-2 applies when the breaker is specified for industrial duty — the higher figure reflects the standard's more demanding test sequence (including O-CO at rated service short-circuit). The DC rating of 15 kA at 60 V covers DC auxiliary circuits fed from the same bus. ## Thermal derating and environmental limits The evidence specifies a derating curve: max 95 % humidity at 55 °C, dropping to max 55 % at 70 °C and max 35 % at 75 °C. In a sealed panel with multiple breakers ganged together, this derating matters — the C-curve's thermal trip element responds to ambient heat, so a tightly packed row near the top of the enclosure may nuisance-trip if the internal temperature exceeds 55 °C without applying the derating factor. Certified to IEC / EN 60898-1 and IEC / EN 60947-2, with UL 1077 recognition for the North American market (5 kA at AC per UL 1077 / CSA C22.2 No.235). Sealable terminals are standard — allows the panel builder to lock the cover after commissioning.","metaTitle":"Siemens 5SY7340-7 SENTRON MCB, 3P C-Curve, 15/20 kA","metaDescription":"Siemens SENTRON 5SY7340-7 miniature circuit breaker, 3-pole C-curve, rated 400 V AC, 15 kA per EN 60898-1 / 20 kA per IEC 60947-2. Current production. Quoted to order.","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","Energy Limitation Class":"3","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 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":"3.5 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=168604&mlfb=5SY7340-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7340-7/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of the 5SY7340-7?","answer":"It is a 3-pole C-curve MCB rated 400 V AC, 50/60 Hz, with breaking capacities of 15 kA per EN 60898-1 and 20 kA per IEC 60947-2. DC rating is 15 kA at 60 V per IEC 60947-2. Operating temperature range is -40 °C to +75 °C with derating above 55 °C."},{"question":"Where can I buy the 5SY7340-7 and get current pricing?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will the 5SY7340-7 drop into a panel specified for the 5SY4140-7?","answer":"Both are 3-pole SENTRON MCBs with the same DIN-rail footprint (3 MW, 54 mm wide). The 5SY7340-7 carries a higher breaking capacity (15/20 kA vs the 5SY4140-7's 10 kA typical for the 40 A variant). No rewiring is needed if the panel's SCCR rating accommodates the higher let-through of the 5SY7340-7 — verify the upstream coordination study."},{"question":"What compliance documentation does Siemens provide for the 5SY7340-7?","answer":"The breaker is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077 / CSA C22.2 No.235. It is halogen-free and silicon-free. Standard documentation includes the declaration of conformity and the UL recognition file."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7340-7","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/5SY7340-7 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}}