{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7140-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7140-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7140-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7140-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7140-8 miniature circuit breaker, 1-pole, D tripping characteristic, 40 A rated current, 15 kA (EN 60898) / 20 kA (IEC 60947-2) breaking capacity, 400 V AC, 18 mm width, quick-assembly DIN rail mount.","salesMarkdown":"## SENTRON 5SY7140-8 — 40 A D-curve MCB for high-inrush loads Per the datasheet, the D-curve magnetic trip threshold sits between 10× and 20× In, so it passes the initial spike and clears only on a sustained overload or hard short. Breaking capacity is 15 kA per EN 60898 and 20 kA per IEC 60947-2 at 400 V AC, with a separate 5 kA rating under UL 1077 / CSA C22.2 No. 235. Rated voltage is 400 V AC (phase-to-phase or phase-to-neutral) and 72 V DC maximum. The single-pole form factor occupies one 18 mm width unit on a DIN rail, with quick-assembly mounting and any mounting position permitted. No official successor or replacement order code is listed. The part is part of the SENTRON 5SY7 series, which shares the same DIN-rail footprint and terminal layout as the 5SY4 series — a panel originally wired for a 5SY4140-7 can accept the 5SY7140-8 without rewiring, though the D-curve and breaking-capacity ratings differ between the two. Verify coordination with the upstream protective device if substituting. ## Integration and compliance notes The 18 mm width (one width unit) fits standard distribution board spacing. Touch protection is built in (finger-safe terminals with conductors connected). The breaker is sealable for anti-tamper applications. Ambient temperature range is -40 °C to +75 °C, with humidity derating above 55 °C: max 95% RH at 55 °C, 55% at 70 °C, 35% at 75 °C. Overvoltage category III — suitable for fixed-installation distribution boards downstream of the service entrance. Compliance documentation covers RoHS and REACH (halogen-free and silicon-free construction). The UL 1077 / CSA C22.2 No. 235 listing at 5 kA covers North American supplementary protection applications. The EN 60898 and IEC 60947-2 ratings cover European and international installation standards.","metaTitle":"Siemens 5SY7140-8 SENTRON MCB, 1P D 40 A, 15/20 kA","metaDescription":"Siemens 5SY7140-8 SENTRON miniature circuit breaker, 1-pole, D-curve, 40 A rated, 15 kA (EN 60898) / 20 kA (IEC 60947-2) breaking capacity. Current lifecycle stage, available to or","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SY7140-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 230/400 V 15kA, 1-pole, D, 40A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","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","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":"5SY7","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":"15 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"20 kA","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 DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/717eb5ff839b83c4c2812712e8c772b9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=439004&mlfb=5SY7140-8"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7140-8 at 400 V AC?","answer":"15 kA per EN 60898 and 20 kA per IEC 60947-2 at 400 V AC. A separate 5 kA rating applies under UL 1077 / CSA C22.2 No. 235."},{"question":"Will 5SY7140-8 drop into a panel specified around 5SY4140-7 without rewiring?","answer":"Yes — both share the same 18 mm DIN-rail footprint, quick-assembly mounting, and combined terminal layout. The D-curve and breaking-capacity ratings differ, so verify coordination with the upstream protective device if substituting."},{"question":"What compliance documentation does Siemens provide for 5SY7140-8?","answer":"RoHS and REACH compliance is supported by the halogen-free and silicon-free construction. The breaker carries UL 1077 / CSA C22.2 No. 235 (5 kA), EN 60898 (15 kA), and IEC 60947-2 (20 kA) ratings."},{"question":"Where can I buy 5SY7140-8 and how is it quoted?","answer":"The 5SY7140-8 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers are published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7140-8","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/5SY7140-8 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}}