{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9356-7KK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9356-7KK40","canonicalUrl":"https://aoctrl.com/siemens/5SU9356-7KK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9356-7KK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9356-7KK40, RCBO, 1P+N, 40 A, 30 mA, Type C, 6 kA, 2 MW, IP20.","salesMarkdown":"The Siemens 5SU9356-7KK40 is an RCBO from the SENTRON family with a 40 A rated current (at 30 °C) and a 30 mA residual-current trip in a 2-module-wide (36 mm) DIN-rail housing. The 1P+N design switches the line conductor and disconnects the neutral, but does not protect the neutral against overcurrent — only the line pole is protected. This is standard for single-phase final circuits where the neutral is not overloaded. ## Temperature derating — the real-world current rating At 40 °C it drops 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. Panel builders should apply the derating curve from the datasheet when calculating fill factor and thermal load — a 40 A circuit in a 50 °C panel is actually a 34.8 A circuit. The IP20 rating applies only when the distribution board is installed with conductors connected — the front face is touch-safe, but the terminals are not sealed against dust ingress.","metaTitle":"Siemens 5SU9356-7KK40 SENTRON RCBO, 40 A, 30 mA, Type C","metaDescription":"Siemens 5SU9356-7KK40 SENTRON RCBO, 40 A rated, 30 mA residual current, Type C characteristic, 6 kA breaking capacity. Active production, available to order. Quoted on request.","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","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P+N","Number Of Poles":"2","lifecycle_stage":"current","Mounting Position":"any","at AC rated value":"40 A","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","Overvoltage Category":"III","Design Of The Product":"Instantaneous","Residual Current Type":"A","Weight With Packaging":"280 g","at 30 °C rated value":"40 A","at 40 °C rated value":"37.6 A","at 45 °C rated value":"36.4 A","at 50 °C rated value":"34.8 A","at 55 °C rated value":"32.4 A","Energy Limitation Class":"3","according to EN 61346-2":"F","according to IEC 81346-2":"F","For Testing Equipment Minimum":"195 V","Number Of Modular Width Units":"2","Position Of Power Supply Cord":"Either top or bottom","Tripping Characteristic Class":"C","Number Of Poles With Protection":"1","according to EN 60898 rated value":"6 kA","Tripping Fault Current Rated Value":"30 mA","insulation voltage (Ui) rated value":"264 V","Supply Voltage Frequency Rated Value":"50 Hz","Surge Voltage Resistance Rated Value":"4 000 V","according to IEC 60947-2 rated value":"10 kA","Surge Current Resistance At (8/20) μS":"1 kA","Influence Of The Surrounding Temperature":"Max. 95% humidity","Type Of Voltage Of The Operating Voltage":"AC","Mechanical Service Life (Switching Cycles) Typical":"10 000","for rated value of the current at AC in hot operating state per pole":"0.75 W"}},"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=629382&mlfb=5SU9356-7KK40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU9356-7KK40/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9356-7KK40","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/5SU9356-7KK40 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}}