{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9404-0KK20","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9404-0KK20","canonicalUrl":"https://aoctrl.com/siemens/5SU9404-0KK20","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9404-0KK20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9404-0KK20, RCD-operated circuit breaker (RCBO), 20 A, B-curve, 10 kA, 1P+N, Type AC fault current, 18 mm width.","salesMarkdown":"The Siemens 5SU9404-0KK20 is a SENTRON RCBO — an RCD-operated circuit breaker combining overcurrent protection and residual current detection in a single 18 mm-wide module. It is rated 20 A with a B tripping characteristic and a 10 kA breaking capacity per EN 60898 (also 10 kA per IEC 60947-2). The 1P+N configuration switches the line and monitors the neutral, with Type AC fault current detection for sinusoidal AC residual currents. The 20 A rated current at AC and B-curve define the magnetic trip threshold: B-curve trips at 3–5× rated current, so 60–100 A for a short-circuit, making it suitable for resistive or general-purpose loads with modest inrush — lighting, small control transformers, or office socket circuits. The 1P+N poles with one protected pole mean the line is switched and protected, while the neutral is switched but not overcurrent-protected — typical for single-phase final circuits. Ambient temperature range of -25 to +45 °C covers most indoor panel environments, but derate the continuous current above 30 °C: the evidence shows 20 A at 30 °C, 18.8 A at 40 °C, 18.2 A at 45 °C (–). The 18 mm width occupies one modular unit on a DIN rail, matching the standard SENTRON footprint. IP20 protection applies only when the distribution board is installed with connected conductors — this is a panel-internal device, not for wet or washdown locations. ## Panel integration The 18 mm width and 77 mm depth fit a standard DIN-rail slot in any SENTRON distribution board. Installation depth is 70 mm. Mounting position is any orientation. Supply can enter from either top or bottom. Conductor cross-section accepts 0.75–35 mm² solid or stranded. The touch-protection feature is built in.","metaTitle":"Siemens 5SU9404-0KK20 SENTRON RCBO, 20 A, B-Curve, 10 kA, 1P","metaDescription":"Siemens 5SU9404-0KK20 SENTRON RCBO, 20 A rated, B tripping characteristic, 10 kA breaking capacity per EN 60898, 1P+N, Type AC. Current lifecycle stage. Available 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","Solid":"0.75 ... 35 mm²","Width":"18 mm","title":"5SU9404-0KK20","Height":"125 mm","Maximum":"0.75 W","Stranded":"0.75 ... 35 mm²","at 30 Cel":"20 A","at 40 Cel":"18.8 A","at 45 Cel":"18.2 A","at 50 Cel":"17.4 A","at 55 Cel":"16.2 A","description":"RCBO, 10 kA, 1P+N, Type AC, 100 mA, B char., In: 20 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":"20 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/56b422da2f73887fb53e97c6b678e6cd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629408&mlfb=5SU9404-0KK20"},"ai":{"faq":[{"question":"What conductor sizes does the 5SU9404-0KK20 accept?","answer":"It accepts 0.75 to 35 mm² solid or stranded conductors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9404-0KK20","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/5SU9404-0KK20 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}}