{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9404-0KK25","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9404-0KK25","canonicalUrl":"https://aoctrl.com/siemens/5SU9404-0KK25","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9404-0KK25","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 series, RCD-operated circuit breaker (RCBO), 25 A rated, B tripping characteristic, 10 kA breaking capacity, 1P+N, 2-pole, 18 mm width.","salesMarkdown":"The Siemens 5SU9404-0KK25 is a 1P+N RCD-operated circuit breaker (RCBO) from the SENTRON 5SU9 family, combining overcurrent and residual-current protection in a single 18 mm-wide module. It's rated 25 A at 30 °C with a B tripping curve — meaning it trips between 3 and 5 times rated current, which is the standard choice for general-purpose residential and commercial final circuits where no high inrush from motors or transformers is expected. The breaking capacity is 10 kA per both EN 60898 and IEC 60947-2, so it can safely interrupt fault currents up to that level without upstream cascading. That's the figure that governs coordination with the upstream breaker. ## Thermal derating — the real-world rating At 40 °C it's 23.5 A; at 45 °C it's 22.75 A; at 50 °C it's 21.75 A; at 55 °C it's 20.25 A. The ambient operating range is -25 to +45 °C, so the 45 °C derated figure is the one that applies at the top of the spec window. Storage range is wider: -40 to +75 °C. The 5SU9404-0KK25 occupies one width unit (18 mm) on a DIN rail, with an installation depth of 70 mm and overall depth of 77 mm. It accepts solid or stranded conductors from 0.75 mm² up to 35 mm², which covers everything from lighting final circuits up to submain feeds within its rating. Supply can land on either top or bottom terminals — no orientation restriction. The IP20 rating applies once the distribution board is installed with conductors connected; it's a panel-interior device, not a standalone enclosure. Touch protection is built in.","metaTitle":"Siemens 5SU9404-0KK25 SENTRON RCD Circuit Breaker, 25 A B-cu","metaDescription":"Siemens 5SU9404-0KK25 SENTRON RCD-operated circuit breaker, 25 A rated, B tripping curve, 10 kA breaking capacity per EN 60898. 1P+N, 2-pole, 18 mm wide. Active production. Availab","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"0.75 ... 35 mm²","Width":"18 mm","title":"5SU9404-0KK25","Height":"125 mm","Maximum":"0.75 W","Stranded":"0.75 ... 35 mm²","at 30 Cel":"25 A","at 40 Cel":"23.5 A","at 45 Cel":"22.75 A","at 50 Cel":"21.75 A","at 55 Cel":"20.25 A","description":"RCBO, 10 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","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":"-25 ... +45 °C","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","Energy limiting class":"3","Number of width units":"1","Type of fault current":"AC","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SU9","Current / at AC / rated value":"25 A","Tripping characteristic class":"B","acc. to EN 60898 / rated value":"10 kA","For Testing Equipment / Minimum":"125 V","Position / of power supply cord":"Either top or bottom","Number of poles / with protection":"1","acc. to IEC 60947-2 / rated value":"10 kA","Product feature / Touch protection":"Yes","Supply voltage frequency / rated value":"50 Hz","Tripping residual current / rated value":"100 mA","Influence of the surrounding temperature":"Max. 95% humidity","Surge current resistance / at (8/20) μs":"1 kA","Tightening torque / with screw-type terminals":"1.2 ... 2 N·m","Product function / neutral conductor switching":"No","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/2bd16b5a92efd379bd99caddaaab0903.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629409&mlfb=5SU9404-0KK25"},"ai":{"faq":[{"question":"Where can I buy 5SU9404-0KK25 and get a price?","answer":"We source this part through independent distribution channels. Submit an RFQ against your BOM line; availability and current pricing are confirmed at quote time. No stock count or price is published here."},{"question":"Will 5SU9404-0KK25 drop into a panel specified around 5SU9156-7VK06?","answer":"Both are 1P+N RCBOs in the SENTRON 5SU9 family with the same 18 mm width and 70 mm installation depth, so the mechanical fit is identical. The 5SU9156-7VK06 carries a different current rating and tripping characteristic — check the nameplate rating against your circuit before swapping. The wiring range (0.75 to 35 mm² solid/stranded) and terminal positions are the same."},{"question":"What compliance documentation does Siemens provide for 5SU9404-0KK25?","answer":"The breaker is designed to EN 60898 and IEC 60947-2, with a 10 kA breaking capacity certified under both standards. It carries overvoltage category III rating. The product is halogen-free and silicon-free. For specific RoHS/REACH declarations, refer to the manufacturer's declaration of conformity for the 5SU9 series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9404-0KK25","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/5SU9404-0KK25 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}}