{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7240-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7240-6","canonicalUrl":"https://aoctrl.com/siemens/5SY7240-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7240-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7240-6, 2-pole miniature circuit breaker, B-curve, 15 kA (EN 60898) / 20 kA (IEC 60947-2), 400 V AC, 60 V DC, 2 MW units.","salesMarkdown":"The Siemens 5SY7240-6 is a SENTRON miniature circuit breaker (MCB) in a 2-pole configuration, designed for branch-circuit protection in industrial control panels and distribution boards. Its B-curve tripping characteristic (instantaneous trip between 3 and 5 times rated current) makes it a standard choice for resistive and general-purpose loads where inrush is modest — think lighting circuits, control transformers, or small motor starters with separate overload protection. Breaking capacity is rated at 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 400 V AC (single- or multi-phase) and up to 440 V, this covers most low-voltage industrial supply points. The UL 1077 supplementary-protector listing at 5 kA means it qualifies as a recognized component for North American panels where a full branch-circuit rated breaker is not required. The 2-pole design switches both phase conductors simultaneously — no neutral switching. This suits single-phase line-to-line loads or two-phase subfeeds. Rated operational voltage is 400 V AC / 60 V DC, with a maximum DC operating voltage of 72 V. Frequency is 50/60 Hz. ## Mounting and integration Occupies 2 modular width units (36 mm) on a DIN rail, with a quick-assembly fastening system and any mounting position. Installation depth is 70 mm; overall depth is 76 mm. The IP20 rating (with connected conductors) is standard for enclosed panel mounting — not for wet or washdown environments. Combined terminals at top and bottom simplify daisy-chaining busbars. Sealable design allows lockout/tagout compliance. Halogen-free and silicon-free construction matters for sensitive environments like semiconductor fabs or clean rooms where outgassing can contaminate processes. ## Environmental and derating Ambient temperature range is -40 °C to 75 °C, with humidity derating: max 95% RH at 55 °C, tapering to 35% RH at 75 °C. Pollution degree 3 (conductive pollution or dry non-conductive that becomes conductive) and overvoltage category III are typical for fixed-installation distribution boards. Energy limitation class 3 indicates good current-limiting performance for downstream equipment protection.","metaTitle":"Siemens 5SY7240-6 SENTRON MCB, 2-Pole B-Curve, 15/20 kA","metaDescription":"Siemens 5SY7240-6 SENTRON miniature circuit breaker, 2-pole, B-curve, 15 kA (EN 60898) / 20 kA (IEC 60947-2). Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 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":"2P","Number Of Poles":"2","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":"2","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"B","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":"3.6 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/882dc3d73aed30ddcc92dc0b1120cec4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=195772&mlfb=5SY7240-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7240-6/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7240-6?","answer":"The 5SY7240-6 is rated at 15 kA per EN 60898-1, 20 kA per IEC 60947-2 at 400 V AC, and 15 kA at 60 V DC per IEC 60947-2. Under UL 1077 it is rated at 5 kA."},{"question":"What is the B-curve tripping characteristic?","answer":"The B-curve trips instantaneously between 3 and 5 times rated current, making it suitable for resistive and general-purpose loads with low inrush, such as lighting and control transformers."},{"question":"Where can I buy 5SY7240-6?","answer":"The 5SY7240-6 is sourced to order against an RFQ through independent and authorized distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7240-6","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/5SY7240-6 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}}