{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1646-7FP20","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1646-7FP20","canonicalUrl":"https://aoctrl.com/siemens/5SU1646-7FP20","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1646-7FP20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCBO, 4-pole, C-curve 20 A, 6 kA breaking capacity, 400 V AC, IP20, 4 MW.","salesMarkdown":"Current derating is published across the full ambient range: 20 A at 30 °C drops to 19.5 A at 40 °C, 19.2 A at 45 °C, 18.9 A at 50 °C, 18.7 A at 55 °C, 18.4 A at 60 °C, and 17.8 A at 70 °C. If the panel runs hot — say 50 °C inside — the usable continuous current is 18.9 A, not the 20 A label. The C-curve trips magnetically between 5× and 10× In, so motor-start or capacitor-switching inrush won't nuisance-trip on a properly sized circuit. Rated insulation voltage (Ui) is 500 V, surge voltage resistance 4 kV, overvoltage category III — standard for fixed-installation distribution boards. Depth is 72 mm, height 85 mm, installation depth 70 mm. For a BOM freeze or line-down replacement, this part is a direct drop-in for any panel designed around a 4-pole C-20 A SENTRON RCBO in a 4 MW footprint.","metaTitle":"Siemens 5SU1646-7FP20 SENTRON RCBO, 4P, C-20A, 6kA, 400V AC","metaDescription":"Siemens SENTRON 5SU1646-7FP20 RCBO, 4-pole, C-curve 20A, 6kA breaking capacity per EN 60898 & IEC 60947-2, 400V AC, IP20. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"72 mm","Width":"72 mm","Height":"85 mm","Maximum":"70 °C","Minimum":"-40 °C","Halogen-Free":"No","Design Of Pole":"4P","Number Of Poles":"4","lifecycle_stage":"current","Mounting Position":"any","at AC rated value":"400 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Operating Frequency":"50 Hz","Product Designation":"RCBO","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Instantaneous","Weight With Packaging":"496 g","at 30 °C rated value":"20 A","at 40 °C rated value":"19.5 A","at 45 °C rated value":"19.2 A","at 50 °C rated value":"18.9 A","at 55 °C rated value":"18.7 A","at 60 °C rated value":"18.4 A","at 70 °C rated value":"17.8 A","Energy Limitation Class":"1","For Testing Equipment Minimum":"195 V","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Either top or bottom","Tripping Characteristic Class":"C","Number Of Poles With Protection":"4","according to EN 60898 rated value":"6 kA","insulation voltage (Ui) rated value":"500 V","Supply Voltage Frequency Rated Value":"50 Hz","Surge Voltage Resistance Rated Value":"4 000 V","according to IEC 60947-2 rated value":"6 kA","Surge Current Resistance At (8/20) μS":"0.25 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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/bed74928c9539d6c50f1eb1e06da07d1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1438086&mlfb=5SU1646-7FP20","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1646-7FP20/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between the 5SU1646-7FP20 and the 5SY4304-7CV?","answer":"The 5SY4304-7CV is a Siemens SENTRON MCB (no RCD), while the 5SU1646-7FP20 is an RCBO combining overcurrent and residual current protection in one unit. They share the same 4 MW DIN-rail footprint and C-curve, but the 5SU1646-7FP20 adds earth leakage protection — you cannot swap them without rewiring the RCD function."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1646-7FP20","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/5SU1646-7FP20 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}}