{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1674-7FK81","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1674-7FK81","canonicalUrl":"https://aoctrl.com/siemens/5SU1674-7FK81","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1674-7FK81","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, RCBO, 5SU1674-7FK81, 4-pole, 100 A at 30 °C, 300 mA residual, Type B+, 10 kA breaking capacity, IP20.","salesMarkdown":"The Siemens SENTRON 5SU1674-7FK81 is a 4-pole RCBO — residual-current circuit breaker with integral overcurrent protection — rated 100 A at 30 °C, with a 300 mA residual trip and Type B+ sensitivity. It occupies 11 modular-width units on a DIN rail. The B+ characteristic means it detects smooth DC residual currents up to 1 kHz, pulsating DC, and AC waveforms — essential for VFD-fed loads, UPS-fed circuits, or PV inverters where standard Type A devices can blind to pure DC faults. That puts it squarely in standard distribution-board fault levels for commercial and light industrial panels. ## Thermal derating — the real-world current At 40 °C the device is rated 92.5 A; at 50 °C, 85 A; at 60 °C, 77 A. If your panel ambient runs at 45 °C, you have 89 A available. That derating curve matters in a crowded enclosure — the trip unit responds to actual thermal load, not the label. The mounting position is unrestricted, so vertical or horizontal DIN orientation doesn't change the rating. ## Halogen-free and silicone-free construction Marked as halogen-free and silicone-free. For installations with strict low-smoke, zero-halogen requirements (fire-safety zones, railway infrastructure, ventilation-constrained rooms), this avoids the corrosive byproducts of burning halogens.","metaTitle":"Siemens 5SU1674-7FK81 SENTRON RCBO, 4P, 100 A, 300 mA, B+, 1","metaDescription":"Siemens SENTRON 5SU1674-7FK81 RCBO, 4-pole, 100 A rated at 30 °C, 300 mA residual current, Type B+, 10 kA breaking capacity (IEC/EN). Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"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":"C","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=141323&mlfb=5SU1674-7FK81","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1674-7FK81/alternatives.json"},"ai":{"faq":[{"question":"What is 5SU1674-7FK81 listed depth and width?","answer":"Depth is 77 mm; width is 198 mm (11 modular units at 18 mm each); installation depth (projection behind the panel face) is 70 mm."},{"question":"Will 5SU1674-7FK81 drop into a panel specified around 5SL4363-7 without rewiring?","answer":"No — these are different device classes. The 5SL4363-7 is a 3-pole MCB with a C characteristic; the 5SU1674-7FK81 is a 4-pole RCBO with integral RCD protection. They share the same DIN-rail footprint and terminal pitch, but an RCBO requires both line and neutral connections plus the residual-current sense path. A panel designed for a bare MCB will need additional wiring for the RCD function."},{"question":"Where can I buy 5SU1674-7FK81 and what is the lead time?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1674-7FK81","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/5SU1674-7FK81 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}}