{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9304-0KK20","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9304-0KK20","canonicalUrl":"https://aoctrl.com/siemens/5SU9304-0KK20","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9304-0KK20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCBO, 1P+N, instantaneous design, tripping characteristic B, rated current 20 A, residual fault current 30 mA, breaking capacity 10 kA per EN 60898, 1 modular width (18 mm).","salesMarkdown":"## What it is and what it does The Siemens 5SU9304-0KK20 is a combined residual-current-operated circuit breaker (RCBO) from the SENTRON family — one device that handles both overcurrent protection and earth-leakage detection in a single 1-module-wide (18 mm) package. It protects a single-phase final subcircuit: pole 1 is switched and protected, neutral is switched only. The B tripping curve means the magnetic release trips at 3 to 5 times rated current, suited for resistive and general-purpose loads where inrush is modest. The residual-current element is type AC, detecting sinusoidal AC fault currents at the 30 mA threshold — the standard for personal protection in residential and light commercial panels. Rated 20 A at 30 °C ambient, the device derates to 18.8 A at 40 °C, 18.2 A at 45 °C, 17.4 A at 50 °C, and 16.2 A at 55 °C. In a hot control room or a panel near a kiln, that derating curve is the number that decides whether the circuit holds — not the 20 A nameplate. The 10 kA breaking capacity per EN 60898 means it can safely interrupt a bolted fault up to that level, which covers most domestic and light commercial service-entrance scenarios. ## Integration — DIN rail and panel fit Snaps onto standard 35 mm DIN rail, one modular width (18 mm). Depth is 77 mm (70 mm installation depth behind the rail). Height 125 mm. The supply can enter from top or bottom. With IP20 protection only when the distribution board is installed and conductors connected, this is strictly an enclosed-panel device — not for open mounting. The halogen-free and silicon-free construction matters for environments where outgassing contaminates sensitive electronics or process atmospheres. ## Environmental and compliance Rated for ambient storage from -40 °C to 75 °C, operating range is the same — the device lives where it works. Overvoltage category III, pollution degree 2, surge voltage resistance 4 kV. These ratings tell the specifying engineer it is suited for fixed-installation downstream of the main distribution board, not for outdoor or wet locations.","metaTitle":"Siemens 5SU9304-0KK20 SENTRON RCBO, 1P+N, B Curve, 20A, 30mA","metaDescription":"Siemens SENTRON 5SU9304-0KK20 RCBO, 1P+N, B-curve, 20A rated, 30mA residual current, 10kA breaking capacity, 1 MW wide. Active production, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"18 mm","Height":"125 mm","Maximum":"75 °C","Minimum":"-40 °C","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P+N","Number Of Poles":"2","lifecycle_stage":"current","Mounting Position":"any","at AC rated value":"20 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Operating Frequency":"50/60 Hz","Product Designation":"RCD-operated circuit breaker","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Instantaneous","Residual Current Type":"AC","Weight With Packaging":"260 g","at 30 °C rated value":"20 A","at 40 °C rated value":"18.8 A","at 45 °C rated value":"18.2 A","at 50 °C rated value":"17.4 A","at 55 °C rated value":"16.2 A","Energy Limitation Class":"3","according to EN 61346-2":"F","according to IEC 81346-2":"F","For Testing Equipment Minimum":"115 V","Number Of Modular Width Units":"1","Position Of Power Supply Cord":"Either top or bottom","Tripping Characteristic Class":"B","Number Of Poles With Protection":"1","according to EN 60898 rated value":"10 kA","Tripping Fault Current Rated Value":"30 mA","insulation voltage (Ui) rated value":"264 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","Surge Current Resistance At (8/20) μS":"1 kA","Influence Of The Surrounding Temperature":"Max. 95% humidity","Type Of Voltage Of The Operating Voltage":"AC","Mechanical Service Life (Switching Cycles) Typical":"10 000","for rated value of the current at AC in hot operating state per pole":"0.75 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/afd84d4cd92063d3fe7003ce39deab53.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629251&mlfb=5SU9304-0KK20","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU9304-0KK20/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 5SU9304-0KK20?","answer":"The 5SU9354-7KK16 is a peer from the same SENTRON RCBO family, but it carries a different tripping characteristic and residual-current type — verify the specific B-curve and AC-type requirements before substituting. The 5SU9304-1KK32 and 5SU9356-7KK06 are also related variants with different ratings."},{"question":"Will 5SU9304-0KK20 drop into a panel specified around 5SU9354-7KK16 without rewiring?","answer":"Both are 1-module-wide (18 mm) RCBOs on the same DIN-rail footprint, so mechanical fit is identical. However, the electrical ratings differ — confirm the current, curve, and residual-current type match the circuit design before swapping."},{"question":"Where can I buy 5SU9304-0KK20 and how is it quoted?","answer":"This part is sourced and quoted to order through independent industrial-automation distribution. Submit an RFQ for current pricing and availability — no stock figures or lead-time numbers are published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9304-0KK20","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/5SU9304-0KK20 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}}