{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4540-7CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4540-7CC","canonicalUrl":"https://aoctrl.com/siemens/5SY4540-7CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4540-7CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4540-7CC miniature circuit breaker, 40 A rated current, C tripping characteristic, 2-pole (1P+N), 10 kA breaking capacity per EN 60898, 2 MW units.","salesMarkdown":"## Siemens 5SY4540-7CC — 40 A C-Curve MCB, 2-Pole 1P+N The Siemens 5SY4540-7CC is a SENTRON miniature circuit breaker (MCB) rated for 40 A at AC with a C tripping characteristic. It's a 2-pole design switching both line and neutral (1P+N), occupying 2 modular width units (36 mm) on the DIN rail. Breaking capacity is 10 kA per EN 60898 — sufficient for most industrial and commercial sub-distribution boards where the prospective fault current stays under that threshold. The C-curve means it holds through moderate inrush (5–10× rated current), so it's the usual choice for motor-starter feeders, small transformers, and lighting banks with capacitive drivers. ## Temperature derating and panel fit At 35 °C ambient the full 40 A is available. Derate linearly: 37.6 A at 40 °C, 36.36 A at 45 °C, 35.04 A at 50 °C, and 33.68 A at 55 °C. If the panel runs hot — say a crowded enclosure with drives — the 40 A marking on the handle is not the continuous rating; size the upstream conductor for the derated value at your actual ambient. The 76 mm depth (70 mm installation depth) fits standard distribution boards; the quick-assembly system clips onto the DIN rail without tools. Mounting position is any, which simplifies layout in tight gland-plate zones.","metaTitle":"Siemens 5SY4540-7CC SENTRON MCB, 40A C-Curve 2-Pole 10kA","metaDescription":"Siemens 5SY4540-7CC SENTRON miniature circuit breaker, 40A rated current, C tripping characteristic, 10kA breaking capacity per EN 60898. 2-pole 1P+N design. Active production. Sou","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY4540-7CC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230 V 10kA, 1+N-pole, C, 40 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P+N","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"40 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Energy Limitation Class":"3","according to EN 61346-2":"F","at 35 °C / rated value":"40 A","at 40 °C / rated value":"37.6 A","at 45 °C / rated value":"36.36 A","at 50 °C / rated value":"35.04 A","at 55 °C / rated value":"33.68 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"10 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","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","Product Component / Neutral Conductor Switching":"Yes","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","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/e32ca9fd69ecfedc743c2f8374f5eff3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1096&mlfb=5SY4540-7CC"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4540-7CC","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/5SY4540-7CC 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}}