{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1374-8AK81","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1374-8AK81","canonicalUrl":"https://aoctrl.com/siemens/5SU1374-8AK81","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1374-8AK81","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCBO, Super Resistant K, 4P, 100 A, D-curve, 30 mA Type B, 10 kA, 11 MW, IP20.","salesMarkdown":"It combines a 100 A MCB with D tripping characteristic and a 30 mA Type B residual current device in one 11 modular-width unit. Type B residual current detection means it catches smooth DC fault currents, AC pulsating currents, and high-frequency AC — the full spectrum you get from variable-speed drives, UPS systems, and PV inverters. That 30 mA trip threshold protects personnel against direct-contact faults. The D-curve (10-20x In) handles high inrush loads like motor starters, welding transformers, and large capacitor banks without nuisance tripping on startup. At 30 °C ambient the device carries its full 100 A. That drops to 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. Mounting position is any, and supply can enter from top or bottom, which simplifies busbar layout in a crowded enclosure. The 77 mm depth plus 70 mm installation depth means it fits standard flush-mount consumer units and distribution boards without a deep can. ## Panel fit and compliance At 11 modular width units (198 mm) this is a wide device — plan for it in the DIN rail layout before you start wiring. Rated insulation voltage is 440 V, overvoltage category III, pollution degree 2.","metaTitle":"Siemens 5SU1374-8AK81 SENTRON RCBO, 100 A, 30 mA, Type B, D-","metaDescription":"Siemens SENTRON 5SU1374-8AK81 RCBO, 100 A rated, 30 mA residual current, Type B, D-curve, 10 kA breaking capacity, 4-pole, 11 MW. Current lifecycle. Sourced to order. Request RFQ.","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","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Operating Frequency":"50/60 Hz","Product Designation":"RCBO","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","Energy Limitation Class":"3","Weight / With Packaging":"2 082 g","according to EN 61346-2":"F","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","according to IEC 81346-2":"F","Number Of Modular Width Units":"11","Tripping Characteristic Class":"D","For Testing Equipment / Minimum":"195 V","Position / Of Power Supply Cord":"Either top or bottom","Number Of Poles / With Protection":"4","according to EN 60898 / rated value":"10 kA","Tripping Fault Current / Rated Value":"30 mA","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","Influence Of The Surrounding Temperature":"Max. 95% humidity","Surge Current Resistance / At (8/20) μS":"3 kA","Type Of Voltage / Of The Operating Voltage":"AC","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/51f78b18dc66ccd1b6950e8994ceec12.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=339920&mlfb=5SU1374-8AK81","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1374-8AK81/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between 5SU1374-8AK81 and a standard AC-type RCBO?","answer":"The 5SU1374-8AK81 uses Type B residual current detection, which covers smooth DC, pulsating DC, and AC fault currents. A standard AC-type RCD detects only sinusoidal AC faults and will not trip on pure DC fault current from a drive or inverter."},{"question":"Where can I buy 5SU1374-8AK81 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time — no stock figures are published here."},{"question":"What is the depth of 5SU1374-8AK81?","answer":"The device depth is 77 mm, with an installation depth of 70 mm. It fits standard flush-mount enclosures without a deep can."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1374-8AK81","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/5SU1374-8AK81 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}}