{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9404-0KK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9404-0KK40","canonicalUrl":"https://aoctrl.com/siemens/5SU9404-0KK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9404-0KK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, RCD-operated circuit breaker, 5SU9404-0KK40, 40 A AC, B curve, 1P+N, 10 kA breaking capacity, 18 mm width.","salesMarkdown":"The Siemens 5SU9404-0KK40 is a SENTRON RCD-operated circuit breaker — an RCBO that combines overcurrent protection and residual current detection in one 18 mm-wide unit. At 40 °C it derates to 37.6 A; at 45 °C to 36.4 A; at 50 °C to 34.8 A; at 55 °C to 32.4 A. Overvoltage category III means it's rated for fixed-installation distribution boards, not plug-in portable gear. It's a 1P+N design — one protected pole plus a switched neutral. The neutral pole is not overcurrent-protected; it just breaks and makes with the phase. For pulsating DC or smooth DC faults you'd need a type A or B RCD module. The instantaneous design means no intentional time delay — it trips within the standard RCD response window. Wire range accepts 0.75 to 35 mm² both solid and stranded. That covers everything from 1.5 mm² lighting circuits up to 10 mm² feeder tails. Installation depth is 70 mm; the overall depth is 77 mm. At 18 mm wide (one width unit), it fits standard DIN-rail enclosures with standard busbar spacing. Touch protection is built in, so live terminals are shielded when the breaker is in place. ## Panel integration The 18 mm width (one modular unit) means it takes up one slot in a distribution board. Supply can come from either top or bottom — no mandatory orientation.","metaTitle":"Siemens 5SU9404-0KK40 SENTRON RCD Circuit Breaker, 40 A, B C","metaDescription":"Siemens 5SU9404-0KK40 SENTRON RCD-operated circuit breaker, 40 A rated, B tripping characteristic, 10 kA breaking capacity, 1P+N, 18 mm wide. Currently in production. Available to","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":"5SU9404-0KK40","Height":"125 mm","Maximum":"0.75 W","Stranded":"0.75 ... 35 mm²","at 30 Cel":"40 A","at 40 Cel":"37.6 A","at 45 Cel":"36.4 A","at 50 Cel":"34.8 A","at 55 Cel":"32.4 A","description":"RCBO, 10 kA, 1P+N, Type AC, 100 mA, B char., In: 40 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":"40 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/6ce3cdf75f5cfe80207bd764d5998380.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629411&mlfb=5SU9404-0KK40"},"ai":{"faq":[{"question":"Where can I buy the 5SU9404-0KK40 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of the 5SU9404-0KK40?","answer":"10 kA rated value per both EN 60898 and IEC 60947-2. That's the maximum short-circuit current it can safely interrupt."},{"question":"What wire sizes does the 5SU9404-0KK40 accept?","answer":"Solid and stranded conductors from 0.75 mm² up to 35 mm². That covers most final subcircuit sizes in a distribution board."},{"question":"What compliance documentation is available for this part?","answer":"The part carries approvals per EN 60898 and IEC 60947-2. It is halogen-free and silicon-free. Specific RoHS/REACH/UL declarations are available on request at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9404-0KK40","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/5SU9404-0KK40 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}}