{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9306-0KK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9306-0KK40","canonicalUrl":"https://aoctrl.com/siemens/5SU9306-0KK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9306-0KK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 series, RCD-operated circuit breaker (RCBO), 40 A, Type B, 6 kA, 1P+N, 18 mm width unit.","salesMarkdown":"The Siemens 5SU9306-0KK40 is a 1P+N RCD-operated circuit breaker (RCBO) from the SENTRON 5SU9 series, combining overcurrent protection and residual current detection in a single 18 mm wide module. The instantaneous design (no intentional delay) means it trips on the first half-cycle of a fault — suited for direct protection of final circuits where fast disconnection is required. Supply can enter from either top or bottom, which simplifies busbar routing in a crowded panel. The IP20 rating applies once the distribution board is installed with connected conductors — treat it as a panel-internal device, not a surface-mount standalone. ## Thermal behaviour and derating At 40 °C it derates to 37.6 A, at 45 °C to 36.4 A, at 50 °C to 34.8 A, and at 55 °C to 32.4 A — a roughly 19 % reduction from 30 °C to 55 °C that must be factored into the circuit design if the enclosure runs warm.","metaTitle":"Siemens 5SU9306-0KK40 SENTRON RCD/MCB, 40A Type B 6kA 1P+N","metaDescription":"Siemens 5SU9306-0KK40 SENTRON RCD-operated circuit breaker, 40A rated, 6kA breaking capacity, Type B tripping, 1P+N. Current lifecycle stage. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"0.75 ... 35 mm²","Width":"18 mm","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","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":"6 kA","For Testing Equipment / Minimum":"115 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":"30 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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/afd84d4cd92063d3fe7003ce39deab53.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629275&mlfb=5SU9306-0KK40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU9306-0KK40/alternatives.json"},"ai":{"faq":[{"question":"What conductor sizes does 5SU9306-0KK40 accept?","answer":"Solid or stranded conductors from 0.75 mm² up to 35 mm²."},{"question":"Does 5SU9306-0KK40 replace 5SY3132-6 in an existing panel?","answer":"No — 5SU9306-0KK40 is a combined RCD/MCB (RCBO) with residual current detection, while 5SY3132-6 is a standard MCB without RCD functionality. They are not drop-in substitutes; the circuit design must account for the RCD element."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9306-0KK40","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/5SU9306-0KK40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}