{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1646-6FP16","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1646-6FP16","canonicalUrl":"https://aoctrl.com/siemens/5SU1646-6FP16","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1646-6FP16","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCBO, 4-pole, type B, 16 A at 30 °C, 6 kA per EN 60898, 400 V AC, IP20.","salesMarkdown":"## Siemens SENTRON 5SU1646-6FP16 RCBO — 4-pole, Type B, 16 A The Siemens 5SU1646-6FP16 is a 4-pole RCBO (residual current circuit breaker with overcurrent protection) from the SENTRON family, combining earth leakage and overcurrent protection in a single 4-module-width unit. It carries a type B tripping characteristic — the magnetic release operates between 3 and 5 times In, so it handles moderate inrush from resistive and lightly inductive loads without nuisance trips, while still clearing a hard short fast. Rated 16 A at 30 °C ambient, 400 V AC, with a 6 kA breaking capacity per EN 60898 (also rated 6 kA per IEC 60947-2). That 6 kA covers most domestic and light commercial distribution boards; if your fault level upstream is higher, you need a current-limiting upstream MCB or fuse to keep the let-through within the 6 kA rating. ## Thermal derating and ambient limits The 16 A rating holds at 30 °C. At 40 °C it derates to 15.2 A; at 50 °C to 14.3 A; at 60 °C to 13.4 A; at 70 °C to 12.5 A. If the panel ambient runs warm — say a crowded enclosure near a drive or transformer — use the 40 °C or 50 °C column for your continuous load calculation. The device itself is rated for ambient from -40 °C to 70 °C, so it can sit in an unheated enclosure in cold climates, but the current must be backed off as temperature rises. Humidity up to 95% is within spec, though the IP20 rating (with distribution board installed and conductors connected) means it is not for wet washdown areas. ## Mounting and integration Snaps onto DIN rail in any orientation — mounting position is unrestricted. The 72 mm width (4 modular units) and 70 mm installation depth fit standard distribution board cutouts. Supply can enter from top or bottom; the spring-cage terminals accept solid or ferruled stranded conductors. Pollution degree 3 and overvoltage category III mean it is rated for the fixed-installation environment inside a panel, not for clean-room or surge-suppressed locations. The 4-pole design switches all three phases plus neutral; the neutral pole is switched and protected, so this unit works in TN-S or TN-C-S systems where the neutral must be broken with the phases.","metaTitle":"Siemens 5SU1646-6FP16 SENTRON RCBO, 4P, 16 A, Type B, 6 kA","metaDescription":"Siemens SENTRON 5SU1646-6FP16 RCBO, 4-pole, 16 A rated at 30 °C, type B tripping curve, 6 kA breaking capacity per EN 60898. Current lifecycle stage. Quoted 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":"488 g","at 30 °C rated value":"16 A","at 40 °C rated value":"15.2 A","at 45 °C rated value":"14.8 A","at 50 °C rated value":"14.3 A","at 55 °C rated value":"13.9 A","at 60 °C rated value":"13.4 A","at 70 °C rated value":"12.5 A","Energy Limitation Class":"3","For Testing Equipment Minimum":"195 V","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Either top or bottom","Tripping Characteristic Class":"B","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=1438079&mlfb=5SU1646-6FP16","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1646-6FP16/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SU1646-6FP16?","answer":"6 kA per EN 60898 and also 6 kA per IEC 60947-2, at 400 V AC."},{"question":"What is the difference between the 5SU1646-6FP16 and the 5SY4304-7CV?","answer":"The 5SU1646-6FP16 is a 4-pole RCBO (combined RCD/MCB) with type B characteristic, 16 A, 6 kA. The 5SY4304-7CV is a Siemens SENTRON MCB only — no residual current protection — with a different tripping characteristic and current rating. They are not direct drop-in substitutes; the 5SU1646-6FP16 replaces both an MCB and an RCD in one unit, while the 5SY4304-7CV covers only overcurrent protection."},{"question":"Where can I buy the 5SU1646-6FP16?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1646-6FP16","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/5SU1646-6FP16 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}}