{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4240-0RC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4240-0RC","canonicalUrl":"https://aoctrl.com/siemens/5SL4240-0RC","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4240-0RC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens Betagard miniature circuit breaker, order code 5SL4240-0RC, 40 A rated current, 2-pole, Z tripping characteristic, 10 kA breaking capacity per IEC 60898 and IEC 60947-2.","salesMarkdown":"## What the Z characteristic means for your circuit That Z curve is the key spec here — it trips between 2 and 3 times rated current, which is tighter than a B curve (3–5× In) and much tighter than C or D. For a sourcing decision, the Z characteristic means this breaker is designed to protect sensitive electronic loads — PLC power supplies, control transformers, instrumentation loops — where a standard breaker might let through enough fault energy to damage downstream semiconductors. ## Temperature derating and environment The 40 A rating holds at 50 °C ambient. Above that, derate: 39.1 A at 55 °C, 38.1 A at 60 °C. At 30 °C the breaker can carry 43.6 A continuous. Depth is 76 mm, height 90 mm, width 36 mm (2 modular units). Installation depth is 70 mm. Sealable, halogen-free, silicon-free construction. The 36 mm width matches standard 2-pole MCB footprint — drops into any panel designed for that form factor without rewiring.","metaTitle":"Siemens 5SL4240-0RC Betagard MCB 40A 2P Z-Char 10kA","metaDescription":"Siemens 5SL4240-0RC Betagard miniature circuit breaker, 40 A, 2-pole, Z characteristic, 10 kA breaking capacity per IEC 60898 & IEC 60947-2. Active production. Sourced to order. Re","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-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":"2P","Number Of Poles":"2","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"Betagard","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","Energy Limitation Class":"NA","according to EN 61346-2":"F","at 30 °C / rated value":"43.6 A","at 40 °C / rated value":"41.8 A","at 45 °C / rated value":"40.9 A","at 50 °C / rated value":"40 A","at 55 °C / rated value":"39.1 A","at 60 °C / rated value":"38.1 A","according to IEC 81346-2":"F","Number Of Modular Width Units":"2","Tripping Characteristic Class":"Z","at DC / rated value / maximum":"72 V","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"415 V","according to IEC 60947-2 / rated value":"10 kA","Type Of Voltage / Of The Operating Voltage":"AC","with multi-phase operation / at AC / maximum":"440 V","with multi-phase operation / at AC / rated value":"440 V","vibration resistance / according to IEC 60068-2-6":"50 m/s² at 25 to 150 Hz","with single-phase operation / at AC / rated value":"440 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/77b3fe62c514fdaf9d52ccbc99f9d87c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1502375&mlfb=5SL4240-0RC","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SL4240-0RC/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 5SL4240-0RC?","answer":"The depth is 76 mm, with an installation depth of 70 mm."},{"question":"What compliance documentation is available for 5SL4240-0RC?","answer":"The breaker is halogen-free and silicon-free. Compliance documentation including RoHS and REACH declarations is typically provided by Siemens for the Betagard series; confirm specific certifications with your order."},{"question":"Will 5SL4240-0RC fit in a panel designed for 5SL6550-7BB?","answer":"The 5SL4240-0RC is a 2-pole, 36 mm wide MCB — the same standard footprint as other 2-pole Siemens MCBs. It will physically drop into a panel designed for a 2-pole Siemens breaker without rewiring, provided the Z characteristic and 40 A rating match your circuit requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4240-0RC","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/5SL4240-0RC 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}}