{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1674-8BK81","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1674-8BK81","canonicalUrl":"https://aoctrl.com/siemens/5SU1674-8BK81","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1674-8BK81","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCBO, 4-pole, 100A at 30°C, D characteristic, 10kA, 11 MW, 5SU1674-8BK81.","salesMarkdown":"The Siemens 5SU1674-8BK81 is a 4-pole SENTRON RCBO (residual current circuit breaker with overcurrent protection) rated 100 A at 30 °C with a D tripping characteristic and a 10 kA breaking capacity certified to both EN 60898 and IEC 60947-2. The 11-module-width (198 mm) body and 77 mm depth fit standard DIN-rail enclosures, but the 11 MW footprint is wider than a typical 4-pole MCB — plan your rail space accordingly. ## Temperature derating — the real-world current you can count on The 100 A rating is only valid at 30 °C ambient. At 40 °C the continuous rating drops to 92.5 A, at 45 °C to 89 A, at 50 °C to 85 A, at 55 °C to 81 A, and at 60 °C to 77 A. If your panel runs warm — and most enclosed distribution boards do — size your load against the derated figure, not the headline 100 A. The surrounding temperature influence is listed as max 95% humidity, so condensation inside the enclosure is the bigger concern than dry heat. ## Approvals and compliance documentation The insulation voltage (Ui) is rated 440 V, overvoltage category III, pollution degree 2. IP20 protection applies when installed in a distribution board with connected conductors — the enclosure itself provides the environmental seal.","metaTitle":"Siemens 5SU1674-8BK81 SENTRON RCBO, 100A D-curve, 10kA","metaDescription":"Siemens 5SU1674-8BK81 SENTRON RCBO, 4-pole, 100A rated at 30°C, D tripping characteristic, 10kA breaking capacity per EN 60898 & IEC 60947-2. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"198 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"4P","Number Of Poles":"4","lifecycle_stage":"current","Mounting Position":"any","at AC rated value":"230/400 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Operating Frequency":"50/60 Hz","Product Designation":"RCBO","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"selective","Weight With Packaging":"2 081 g","at 30 °C rated value":"100 A","at 40 °C rated value":"92.5 A","at 45 °C rated value":"89 A","at 50 °C rated value":"85 A","at 55 °C rated value":"81 A","at 60 °C rated value":"77 A","Energy Limitation Class":"3","For Testing Equipment Minimum":"100 V","Number Of Modular Width Units":"11","Position Of Power Supply Cord":"Either top or bottom","Tripping Characteristic Class":"D","Number Of Poles With Protection":"4","according to EN 60898 rated value":"10 kA","insulation voltage (Ui) rated value":"440 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":"5 kA","Influence Of The Surrounding Temperature":"Max. 95% humidity","Type Of Voltage Of The Operating Voltage":"AC","Mechanical Service Life (Operating Cycles) Typical":"10 000","for rated value of the current at AC in hot operating state per pole":"14 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1441758f8f29d61d484a84627a8d715d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=449113&mlfb=5SU1674-8BK81","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1674-8BK81/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SU1674-8BK81?","answer":"It is rated 10 kA according to both EN 60898 and IEC 60947-2, covering the majority of commercial and light industrial fault-level requirements."},{"question":"Where can I buy the 5SU1674-8BK81 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at the time of quote."},{"question":"What is the D tripping characteristic used for?","answer":"The D-curve has a higher magnetic trip threshold than B or C curves, making it suitable for loads with high inrush currents such as motors, transformers, and welding machines — it reduces nuisance tripping on startup."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1674-8BK81","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/5SU1674-8BK81 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}}