{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6140-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6140-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SY6140-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6140-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6 series miniature circuit breaker, order code 5SY6140-8CC, 1-pole 40 A D-characteristic, 400 V AC, 6 kA per EN 60898, 5 kA per UL 1077, 76 mm depth, wire range 0.75–35 mm² solid/stranded.","salesMarkdown":"## Siemens 5SY6140-8CC — 40 A D-Curve MCB for Motor and Transformer Circuits Breaking capacity is 6 kA per EN 60898 and 5 kA per UL 1077 / CSA C22.2 No.235, so it handles fault currents up to those levels without welding contacts or cascading upstream. That 6 kA IEC rating covers most industrial panelboards on a standard 400 V supply; the UL/CSA listing gives you the same part for North American job sites where the code asks for UL 1077 recognition. Sealable, halogen-free, silicon-free construction — important if this lives in a food plant or a clean room where outgassing matters. A D-curve MCB trips magnetically between 10× and 20× rated current. For this 40 A breaker, that magnetic trip kicks in somewhere above 400 A and below 800 A. That's the right window for motor circuits where the starting current hits 6–8× FLA for a few seconds, or for transformers that pull a magnetizing inrush. A C-curve (5–10×) would nuisance-trip on the same load; a B-curve (3–5×) would trip every time. The thermal element handles the sustained overload — it follows the standard inverse-time curve. So a 45 A overload on a 40 A breaker clears in minutes, not instantly. That's by design: lets a stalled motor heat up the bimetal and trip before the winding cooks, but doesn't react to the normal starting transient. Width is 18 mm — that's one modular unit (1 MW) on a standard DIN rail. Snaps onto the rail via the quick-assembly system, no tools needed. Mounting position any orientation, so it fits vertical or horizontal busbars. This lives inside an enclosure, not out in the weather. Ambient temperature range -25 to +55 °C operating, with a wider -40 to +75 °C storage range. Humidity derating above 55 °C: max 95% RH up to 55 °C, then 55% at 70 °C, 35% at 75 °C.","metaTitle":"Siemens 5SY6140-8CC SENTRON MCB, 1P 40A D-Curve, 6kA IEC","metaDescription":"Siemens 5SY6140-8CC SENTRON miniature circuit breaker, 1-pole 40A D-characteristic, 400V AC, 6kA per EN 60898, 5kA per UL 1077. Current lifecycle stage, available to order. Request","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"18 mm","title":"5SY6140-8CC","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 230/400 V 6kA, 1-pole, D, 40 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Wertebereich":"-25 ... +55 °C","Mounting type":"Quick assembly system","Number of poles":"1","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-40 ... +75 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"1","Number of poles / Note":"1P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY6CC","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"40 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","Product feature / Touch protection":"Yes","Influence of the surrounding temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","Tightening torque / with screw-type terminals":"2.5 ... 3.5 N·m","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000","Tightening torque [lbf·in] / with screw-type terminals":"22 ... 31 lbf·in"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1f2794c73ed8d8440f3848a86f031de7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=458067&mlfb=5SY6140-8CC"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6140-8CC","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/5SY6140-8CC 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}}