{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9406-0KK25","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9406-0KK25","canonicalUrl":"https://aoctrl.com/siemens/5SU9406-0KK25","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9406-0KK25","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9406-0KK25 RCBO, RCD-operated circuit breaker, 1P+N, 25 A, 6 kA, Type B, 230/240 V AC, 1 MW unit, 18 mm wide.","salesMarkdown":"The Siemens SENTRON 5SU9406-0KK25 is a 1P+N RCD-operated circuit breaker — an RCBO — combining overcurrent and residual-current protection in a single 18 mm wide modular unit. Rated 25 A at 30 °C with a B tripping characteristic, it interrupts fault currents up to 6 kA per EN 60898 and IEC 60947-2. The 1P+N design switches the phase and monitors the neutral, protecting one live conductor while the neutral is switched but not protected. This makes it a direct fit for single-phase final circuits in DIN-rail distribution boards where space is tight — one module width per pole saves rail length. ## Ratings that govern the real application The 25 A rating at 30 °C is the headline number, but the derating curve matters more in a warm panel: at 40 °C it's 23.5 A, at 45 °C it's 22.75 A, at 50 °C it's 21.75 A, and at 55 °C it's 20.25 A. If your enclosure ambient runs above 40 °C, size the circuit for the derated current — not the 25 A sticker. The B curve (3–5 In instantaneous trip) suits resistive and general-purpose loads — lighting, small appliances, control transformers — where inrush is low. For motor or capacitor loads, a C or D curve would be the better call. One modular width (18 mm) per unit, 77 mm depth, 125 mm height. Installation depth is 70 mm — factor that into enclosure depth, especially with wiring ducts.","metaTitle":"Siemens 5SU9406-0KK25 SENTRON RCBO, 25A, 6kA, Type B, 1P+N","metaDescription":"Siemens SENTRON 5SU9406-0KK25 RCBO, 25 A rated, 6 kA breaking capacity, 1P+N, Type B, 230/240 V AC, 1 MW unit. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"18 mm","title":"5SU9406-0KK25","Height":"125 mm","Maximum":"75 °C","Minimum":"-40 °C","description":"RCBO, 6 kA, 1P+N, Type AC, 100 mA, B char., In: 25 A, Un AC: 230 V, pigtail 600 mm, solid N","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":"230/240 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Operating Frequency":"50/60 Hz","Product Designation":"RCD-operated circuit breaker","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Instantaneous","Weight With Packaging":"260 g","at 30 °C rated value":"25 A","at 40 °C rated value":"23.5 A","at 45 °C rated value":"22.75 A","at 50 °C rated value":"21.75 A","at 55 °C rated value":"20.25 A","Energy Limitation Class":"3","For Testing Equipment Minimum":"125 V","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"Either top or bottom","Tripping Characteristic Class":"B","Number Of Poles With Protection":"1","according to EN 60898 rated value":"6 kA","insulation voltage (Ui) rated value":"264 V","Supply Voltage Frequency Rated Value":"50 Hz","Surge Voltage Resistance Rated Value":"4 000 V","according to IEC 60947-2 rated value":"6 kA","Surge Current Resistance At (8/20) μS":"1 kA","Influence Of The Surrounding Temperature":"Max. 95% humidity","Type Of Voltage Of The Operating Voltage":"AC","Mechanical Service Life (Operating Cycles) Typical":"10 000","for rated value of the current at AC in hot operating state per pole":"0.75 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1c76d74a4e278fc08fd38d1f8d77a7dc.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629422&mlfb=5SU9406-0KK25"},"ai":{"faq":[{"question":"Who supplies 5SU9406-0KK25 and how is it quoted for volume purchases?","answer":"Sourced through independent distribution channels; quoted to order against an RFQ. Availability and current pricing confirmed at quote time."},{"question":"What is 5SU9406-0KK25's listed depth?","answer":"The listed depth is 77 mm, with an installation depth of 70 mm."},{"question":"What is 5SU9406-0KK25's listed width?","answer":"The listed width is 18 mm, corresponding to one modular unit on DIN rail."},{"question":"Will 5SU9406-0KK25 drop into a panel specified around 5SY6040-6 without rewiring?","answer":"Both are 1-module-wide RCBOs on DIN rail, so the mechanical fit is the same. However, verify the rating and tripping characteristic match your circuit — the 5SU9406-0KK25 is a 25 A Type B, 6 kA, 1P+N unit; the 5SY6040-6 is a different variant with its own ratings. Check the panel schedule before swapping."},{"question":"What compliance documentation does Siemens provide for 5SU9406-0KK25?","answer":"The product is certified to EN 60898 and IEC 60947-2 for breaking capacity. It is halogen-free and silicon-free. The degree of pollution is 2, overvoltage category III, and it carries an IP20 rating when installed in a distribution board. Standard Siemens documentation includes CE declaration and material compliance data (RoHS/REACH) — request these with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9406-0KK25","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/5SU9406-0KK25 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}}