{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1674-8AK81","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1674-8AK81","canonicalUrl":"https://aoctrl.com/siemens/5SU1674-8AK81","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1674-8AK81","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCBO, 5SU1674-8AK81, Super Resistant K design, 4-pole, 100 A rated, Type B, 300 mA residual, D tripping characteristic, 10 kA breaking capacity.","salesMarkdown":"Rated at 100 A (at 30 °C ambient) with a 300 mA residual fault current threshold, it provides both earth leakage and short-circuit/overload protection in a single modular device — a space-saving choice for distribution boards where separate RCCB and MCB would consume more width. ## Type B residual current and D-curve overcurrent — what they mean for the installation Type B residual current detection covers smooth DC, pulsating DC, and AC residual currents — essential where variable-frequency drives, UPS systems, or rectifier loads are downstream, since those can generate DC fault currents that Type A or AC devices cannot detect. Temperature derating is published: 100 A at 30 °C, 92.5 A at 40 °C, 89 A at 45 °C, 85 A at 50 °C, 81 A at 55 °C, and 77 A at 60 °C — the panel designer must apply these when the RCBO is enclosed or in a warm environment. Width is 198 mm (11 modular width units), depth 77 mm, height 90 mm, with an installation depth of 70 mm — it occupies a standard DIN-rail footprint but at 11 MW is wider than a typical 4-pole MCB (usually 4 MW), so verify available rail space before panel layout. Mounting position is any; supply can enter from top or bottom, which simplifies busbar and cable routing in crowded enclosures. IP20 rating applies when installed in a distribution board with connected conductors — the RCBO itself is not sealed for wet or dusty environments; it belongs inside a panel.","metaTitle":"Siemens 5SU1674-8AK81 SENTRON RCBO, Type B, 100 A, 300 mA, 1","metaDescription":"Siemens SENTRON 5SU1674-8AK81 RCBO, 4-pole, 100 A rated, 300 mA residual current, Type B, 10 kA breaking capacity (IEC/EN). Active production. Quoted 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","Number Of Poles":"4","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":"RCBO","acc. to IEC 81346-2":"F","at AC / rated value":"100 A","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Super resistant K","Residual Current Type":"B","Number Of Poles / Note":"4P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","Weight / With Packaging":"2 050 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","Number Of Modular Width Units":"11","Tripping Characteristic Class":"D","acc. to EN 60898 / rated value":"10 kA","For Testing Equipment / Minimum":"100 V","Position / Of Power Supply Cord":"Either top or bottom","Number Of Poles / With Protection":"4","acc. to IEC 60947-2 / rated value":"10 kA","Product Feature / Touch Protection":"Yes","Tripping Fault Current / Rated Value":"300 mA","Supply Voltage Frequency / Rated Value":"50 Hz","Influence Of The Surrounding Temperature":"Max. 95% humidity","Surge Current Resistance / At (8/20) μS":"3 kA","Product Function / Neutral Conductor Switching":"Yes","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1ce4d304a33a9455c78ba66f0fc63d0e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=302560&mlfb=5SU1674-8AK81","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1674-8AK81/alternatives.json"},"ai":{"faq":[{"question":"What does Type B residual current detection mean for my installation?","answer":"It detects smooth DC, pulsating DC, and AC residual currents — required when downstream loads include VFDs, UPS systems, or rectifiers that can generate DC fault currents."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1674-8AK81","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/5SU1674-8AK81 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}}