{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4240-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4240-7","canonicalUrl":"https://aoctrl.com/siemens/5SY4240-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4240-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4240-7, 2-pole miniature circuit breaker, C-curve, 10 kA (EN 60898-1) / 15 kA (IEC 60947-2), 400 V AC, 60 V DC, 2 MW units wide, IP20.","salesMarkdown":"The 5SY4240-7 carries 10 kA per EN 60898-1, 15 kA per IEC 60947-2 at 400 V AC, and 15 kA per IEC 60947-2 at 60 V DC. For UL 1077 / CSA C22.2 No.235 installations it is rated 5 kA. That 15 kA IEC figure gives headroom for high-fault locations near transformers or large drives — a standard 10 kA MCB would be marginal there. The dual-standard rating means it is accepted in IEC panels (EN 60898-1 for residential/commercial, IEC 60947-2 for industrial) and UL-recognized component circuits (UL 1077) without needing a separate UL 489 listed breaker. Voltage rating: 400 V AC (single- or multi-phase operation up to 440 V AC), 60 V DC nominal with a maximum operating voltage of 72 V DC. The 2-pole design does not switch the neutral (neutral conductor switching: no), so it is intended for double-pole overcurrent protection on line and switched neutral in single-phase circuits, or as a two-pole device on a 2-wire DC circuit. The supply frequency is 50/60 Hz. ## Installation and environmental fit Mounts in any position via the quick assembly system (snap-on DIN rail). The temperature range is -40 °C to 75 °C, with humidity derating: max 95% RH up to 55 °C, 55% RH up to 70 °C, 35% RH up to 75 °C. Sealable terminals (sealable: yes) allow the panel builder to lock the cover after commissioning — common for utility metering or tenant sub-metering where tamper evidence is required. Combined terminal top and bottom (combined terminal top: yes, combined terminal bottom: yes) means each pole accepts both the incoming and outgoing conductor under the same screw, simplifying daisy-chaining.","metaTitle":"Siemens 5SY4240-7 SENTRON MCB, 2P C-Curve, 10kA/15kA","metaDescription":"Siemens 5SY4240-7 SENTRON miniature circuit breaker, 2-pole C-curve, 10 kA per EN 60898-1 / 15 kA per IEC 60947-2. Current 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","title":"5SY4240-7","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, 2-pole, C, 40A, D=70 mm","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":"C","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":"3.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$30.48","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/474a0490eada33d5d42ed681a17fe366.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=508961&mlfb=5SY4240-7"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4240-7 at 400 V AC?","answer":"10 kA per EN 60898-1 and 15 kA per IEC 60947-2 at 400 V AC. For UL 1077 installations it is rated 5 kA."},{"question":"Will 5SY4240-7 drop into a panel specified around 5SY4140-7 without rewiring?","answer":"Yes — both share the same 2-pole C-curve design, 2 MW width, DIN-rail mounting, and terminal layout. The only difference is the rated current (24 A vs 14 A), so the physical swap is direct as long as the load current matches the new breaker rating."},{"question":"What compliance documentation does Siemens provide for 5SY4240-7?","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, which supports RoHS/REACH compliance claims."},{"question":"Where can I buy 5SY4240-7 and get current pricing?","answer":"We source this current-production part through independent distribution. Availability and pricing are confirmed at quote time against an RFQ — submit your target quantity and delivery window for a firm quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4240-7","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/5SY4240-7 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}}