{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4540-5","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4540-5","canonicalUrl":"https://aoctrl.com/siemens/5SY4540-5","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4540-5","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4, miniature circuit breaker, 2-pole (1P+N), 40 A, tripping characteristic A, 10 kA (EN 60898) / 15 kA (IEC 60947-2), 230 V AC, 72 V DC max, 5 kA (UL 1077).","salesMarkdown":"The Siemens 5SY4540-5 is a 2-pole (1P+N) miniature circuit breaker from the SENTRON 5SY4 family, rated 40 A with a Type A tripping characteristic. Type A trips on short-circuit and overload, with a defined sensitivity to pulsating DC fault currents — useful where downstream electronics or rectified loads could produce half-wave faults that a Type B or C might miss. Rated 230 V AC with a maximum DC voltage of 72 V, it handles single-phase AC branch circuits and low-voltage DC loads like control transformers or solenoids. The 5 kA interrupting rating per UL 1077 / CSA C22.2 No. 235 means it is recognised as a supplementary protector for North American panels — not a branch-circuit rated breaker under UL 489, so verify the application's code requirements if you are specifying for a UL-listed panel. Occupies 2 width units (36 mm) with a depth of 76 mm and an installation depth of 70 mm — standard 36 mm wide MCB footprint, no surprises for panel layout. Sealable (yes) for applications requiring tamper-evident covers. Halogen-free and silicon-free construction suits clean-room or sensitive electronics areas where outgassing could contaminate contacts or optics. Approvals include EN 60898 (household-type MCB), IEC 60947-2 (industrial circuit-breaker), and UL 1077 / CSA C22.2 No. 235 (supplementary protector). The product designation (miniature circuit breaker) and design (5SY4) align with the SENTRON portfolio for panel-building and industrial switchgear.","metaTitle":"Siemens 5SY4540-5 SENTRON MCB, 2-Pole 40A Type A, 10kA","metaDescription":"Siemens 5SY4540-5 SENTRON miniature circuit breaker, 2-pole (1P+N), 40 A rated, tripping characteristic A, 10 kA (EN 60898) / 15 kA (IEC 60947-2). Current lifecycle stage. Availabl","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","title":"5SY4540-5","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 230 V 10kA, 1+N-pole, A, 40A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","During Storage":"-40 ... +75 °C","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-40 ... +70 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"230 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"2","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY4","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"40 A","Tripping characteristic class":"A","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"15 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","Tightening torque / with screw-type terminals":"2.5 ... 3.5 N·m","Product function / neutral conductor switching":"Yes","with single-phase operation / at AC / rated value":"250 V","Mechanical service life (switching cycles) / typical":"10 000","Tightening torque [lbf·in] / with screw-type terminals":"22 ... 31 lbf·in","AWG number / as coded connectable conductor cross section":"18 ... 4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7505bc8cf63f0dbdad47a0932e843e15.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=445931&mlfb=5SY4540-5"},"ai":{"faq":[{"question":"Where can I buy 5SY4540-5 and how do I get a price?","answer":"The 5SY4540-5 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is 5SY4540-5's listed depth?","answer":"The depth is 76 mm, with an installation depth of 70 mm. Width is 36 mm (2 width units), height is 90 mm."},{"question":"What conductor sizes does 5SY4540-5 accept?","answer":"The terminals accept solid or stranded conductors from 0.75 to 35 mm²."},{"question":"What compliance documentation does Siemens provide for 5SY4540-5?","answer":"The breaker carries approvals to EN 60898 (10 kA), IEC 60947-2 (15 kA), and UL 1077 / CSA C22.2 No. 235 (5 kA). It is halogen-free and silicon-free. Standard Siemens documentation includes a CE declaration and RoHS/REACH compliance data sheets."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4540-5","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/5SY4540-5 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}}