{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4540-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4540-7","canonicalUrl":"https://aoctrl.com/siemens/5SL4540-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4540-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4540-7 miniature circuit breaker, 1P+N, 40 A, C-curve, 230 V AC, 10 kA breaking capacity, 2 MW units.","salesMarkdown":"The Siemens 5SL4540-7 is a SENTRON miniature circuit breaker (MCB) with a 1-pole-plus-neutral (1P+N) design, rated 40 A at 230 V AC with a C-curve tripping characteristic. ## Temperature derating — the real current rating changes with the panel environment At 40 °C that drops to 36.96 A; at 45 °C it's 35.2 A; at 55 °C it's 31.85 A. The panel designer should size the load to the derated value at the expected internal temperature, not the 30 °C reference. The 5SL4540-7 occupies 2 modular width units (36 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. It is sealable (e.g., with lead seals or adhesive labels) for tamper-evident installations. ## DC rating and single-phase use While primarily an AC breaker (230 V rated, 50/60 Hz), the 5SL4540-7 carries a DC rating up to 72 V maximum. That covers DC auxiliary circuits in a panel or small PV string combiner boxes, but the DC breaking capacity is not stated — the 10 kA figure applies to AC only. For single-phase AC operation the voltage limit rises to 250 V.","metaTitle":"Siemens 5SL4540-7 SENTRON MCB, C-40A, 1P+N, 10kA","metaDescription":"Siemens 5SL4540-7 SENTRON miniature circuit breaker, 1P+N, 40 A, C-curve, 10 kA breaking capacity per IEC 60898. Active production, sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P+N","Number Of Poles":"2","lifecycle_stage":"current","Mounting Position":"any","at AC rated value":"40 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","at 30 °C rated value":"40 A","at 40 °C rated value":"36.96 A","at 45 °C rated value":"35.2 A","at 55 °C rated value":"31.85 A","Energy Limitation Class":"3","according to EN 61346-2":"F","according to IEC 81346-2":"F","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","supply voltage at AC rated value":"230 V","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"10 kA","Type Of Voltage Of The Operating Voltage":"AC","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with single-phase operation at AC rated value":"250 V","Mechanical Service Life (Switching Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"3.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/04a3c0fc2da4fa3c9cc6f0f67b9ed442.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=399874&mlfb=5SL4540-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4540-7/alternatives.json"},"ai":{"faq":[{"question":"What is 5SL4540-7's listed depth (76 mm) on this component line?","answer":"The total depth is 76 mm; the installation depth (the dimension behind the panel face) is 70 mm. The width is 36 mm (2 modular units)."},{"question":"Will 5SL4540-7 drop into a panel that was specified around 5SL4363-7 without rewiring?","answer":"The 5SL4363-7 is a 63 A C-curve 1P+N MCB in the same SENTRON 5SL family, sharing the same 2 MW footprint (36 mm wide). The 5SL4540-7 (40 A) will physically fit the same DIN-rail position and busbar connection, but the circuit must be re-protected at 40 A — the breaker does not match the 63 A rating of the original specification. No rewiring of the busbar or neutral link is needed; the load-side cable must be sized for 40 A."},{"question":"What compliance documentation does this brand provide for 5SL4540-7 (RoHS, REACH, UL, IEC)?","answer":"The 5SL4540-7 is certified to IEC 60898 and IEC 60947-2. It is halogen-free and silicon-free, which implies RoHS compliance. For specific documentation (declaration of conformity, UL file number, REACH statement), request them with the RFQ — the manufacturer provides these on request for active SENTRON products."},{"question":"Where can I buy 5SL4540-7 and what is the price?","answer":"This part is sourced 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 figure. No stock count or price is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4540-7","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/5SL4540-7 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}}