{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9406-0KK20","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9406-0KK20","canonicalUrl":"https://aoctrl.com/siemens/5SU9406-0KK20","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9406-0KK20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 series, RCD-operated circuit breaker (RCBO), 1P+N, 2-pole, 20 A rated current, B tripping characteristic, 6 kA breaking capacity per EN 60898 and IEC 60947-2, 18 mm width, IP20.","salesMarkdown":"The Siemens 5SU9406-0KK20 is a SENTRON-series RCD-operated circuit breaker (RCBO) that combines overcurrent protection and residual current protection in a single 18 mm wide module. The breaking capacity is 6 kA per both EN 60898 and IEC 60947-2, which certifies its ability to safely interrupt faults up to that level in a 230/400 V AC distribution panel. This is a 1P+N device — it switches the live conductor and monitors the neutral for residual current, but does not switch the neutral. The fault current type is AC (sinusoidal), and the design is instantaneous (no intentional time delay), so it responds immediately to earth leakage. The 20 A rating applies at 30 °C ambient. At 40 °C the continuous current must be derated to 18.8 A; at 45 °C to 18.2 A; at 50 °C to 17.4 A; and at 55 °C to 16.2 A. The operating ambient range is -25 to +45 °C, so the 45 °C derating figure is the relevant maximum for a panel running near its thermal limit. Storage temperature spans -40 to +75 °C. Power dissipation is 0.75 W at rated load, which is low enough that grouping multiple units in an enclosure does not require special ventilation beyond standard panel design. The energy limiting class is 3, indicating good let-through energy limitation for downstream equipment protection. Height is 125 mm. Supply can enter from either the top or bottom terminals, simplifying busbar routing in a crowded panel. Terminals accept solid conductors from 0.75 to 35 mm² and stranded conductors from 0.75 to 35 mm². Touch protection is provided per the product feature listing. The 5SU9406-0KK20 is designed to EN 60898 (for household and similar installations) and IEC 60947-2 (for low-voltage switchgear and controlgear), with a 6 kA rated short-circuit capacity under both standards.","metaTitle":"Siemens 5SU9406-0KK20 SENTRON RCD Circuit Breaker, 20 A, B C","metaDescription":"Siemens 5SU9406-0KK20 SENTRON RCD-operated circuit breaker, 20 A rated current, B tripping characteristic, 6 kA breaking capacity per EN 60898/IEC 60947-2. 1P+N, 2-pole, 18 mm wide","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":"5SU9406-0KK20","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, 6 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":"6 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":"6 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/f84cfaeac2010c4d9ac9383f2e03e230.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629421&mlfb=5SU9406-0KK20"},"ai":{"faq":[{"question":"What is the rated current and breaking capacity of 5SU9406-0KK20?","answer":"The rated current is 20 A at 30 °C ambient with a B tripping characteristic. The breaking capacity is 6 kA per both EN 60898 and IEC 60947-2."},{"question":"What conductor sizes does 5SU9406-0KK20 accept?","answer":"The terminals accept solid conductors from 0.75 to 35 mm² and stranded conductors from 0.75 to 35 mm²."},{"question":"What is the physical size of 5SU9406-0KK20?","answer":"Width is 18 mm (one width unit), height is 125 mm, overall depth is 77 mm, and installation depth on the DIN rail is 70 mm."},{"question":"Where can I buy 5SU9406-0KK20?","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 compliance documentation does Siemens provide for 5SU9406-0KK20?","answer":"The device is designed to EN 60898 and IEC 60947-2 standards. It is halogen-free and silicon-free. Overvoltage category is III, and IP20 protection applies when installed in a distribution board."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9406-0KK20","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/5SU9406-0KK20 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}}