{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9354-8KK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9354-8KK40","canonicalUrl":"https://aoctrl.com/siemens/5SU9354-8KK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9354-8KK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 series, RCD-operated circuit breaker, 2-pole (1P+N), Type A, D tripping curve, 40 A at 30 °C, 10 kA breaking capacity, 230/240 V AC, 50/60 Hz, 2 MW wide.","salesMarkdown":"The Siemens 5SU9354-8KK40 is a SENTRON RCD-operated circuit breaker — an RCBO that combines overcurrent protection and residual-current detection in one 2-MW (36 mm wide) module. The Type A fault-current detection catches pulsating DC as well as sinusoidal AC earth faults, which matters on single-phase drives or switched-mode supplies that generate DC ripple on the line. Energy limiting class 3 means it lets through less let-through energy than a lower-class breaker, which helps protect the wiring and the load side. ## Thermal derating — read the real current In a warm panel — say 45 °C — the continuous current drops to 36.4 A; at 55 °C it's 32.4 A. If the load is a 3.7 kW motor drawing about 7 A per phase, you have headroom. But if you're pushing a 36 A continuous resistive load in a hot cabinet, the D-curve won't nuisance-trip on inrush, but the thermal element will eventually open at the derated value. ## Integration notes Two width units (36 mm) on standard DIN rail. The neutral pole is switched (not just solid), so it isolates both conductors on a fault. Touch protection is built in; pollution degree 2 covers normal industrial environments with non-conductive dust.","metaTitle":"Siemens 5SU9354-8KK40 SENTRON RCD Circuit Breaker, D Curve,","metaDescription":"Siemens 5SU9354-8KK40 SENTRON RCD-operated circuit breaker. 40 A rated, D tripping curve, 10 kA breaking capacity, Type A fault current. 2-pole 1P+N, 230/240 V AC. Active productio","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"36 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","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","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Degree of pollution":"2","Operating frequency":"50/60 Hz","Product designation":"RCD-operated circuit breaker","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","at AC / rated value":"230/240 V","Overvoltage category":"III","Design of the product":"Instantaneous","Energy limiting class":"3","Number of width units":"2","Type of fault current":"A","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SU9","Tripping characteristic class":"D","acc. to EN 60898 / rated value":"10 kA","For Testing Equipment / Minimum":"195 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","Operating current / at AC / rated value":"40 A","Tripping residual current / rated value":"30 mA","Influence of the surrounding temperature":"Max. 95% humidity","Surge current resistance / at (8/20) μs":"1 kA","Product function / neutral conductor switching":"Yes","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/79f6610cfebb3bc98ed563eb1e55c601.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629335&mlfb=5SU9354-8KK40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU9354-8KK40/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between 5SU9354-8KK40 and 5SU9354-8KK63?","answer":"The 5SU9354-8KK63 is the 63 A variant of the same SENTRON RCBO family, same D curve, same Type A fault detection, same 10 kA breaking capacity. The only difference is the continuous current rating — 40 A versus 63 A. Panel footprint and wiring are identical, so a swap is a direct mechanical fit but requires verifying the load current and upstream protection."},{"question":"Where can I buy 5SU9354-8KK40 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 — no stock count or lead-time number is published here, but a quote request will return real-time supply posture."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9354-8KK40","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/5SU9354-8KK40 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}}