{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9304-1KK45","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9304-1KK45","canonicalUrl":"https://aoctrl.com/siemens/5SU9304-1KK45","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9304-1KK45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 series RCBO, 45 A rated current, C-curve, 10 kA breaking capacity, 1P+N, 18 mm width.","salesMarkdown":"## Ratings that matter for the panel The 5SU9304-1KK45: The 45 A rating at 30 °C is the headline number, but out here in a real panel — especially one stacked tight in a warm cabinet — you need the derated figures. At 40 °C it's 42.3 A; at 45 °C (the upper end of its -25 to +45 °C ambient range) it's 40.95 A; at 50 °C it drops to 39.15 A; at 55 °C it's 36.45 A. If your load pulls 40 A continuous and the panel ambient hits 45 °C, this breaker holds. But push the ambient to 55 °C and you're down to 36.45 A — that's a real constraint for a motor circuit that's already borderline. The energy limiting class is 3, which keeps the let-through energy low enough to protect downstream wiring and devices in a coordinated panel. This RCBO accepts solid or stranded conductors from 0.75 mm² up to 35 mm² — that covers everything from a 1.5 mm² lighting circuit to a 10 mm² feeder. The supply can come from either top or bottom, which saves headaches when you're landing a busbar or looping through a panel. Mounting position is any, so horizontal or vertical panels are fine.","metaTitle":"Siemens 5SU9304-1KK45 SENTRON RCBO, 45 A, 10 kA, C-curve","metaDescription":"Siemens 5SU9304-1KK45 SENTRON RCBO, 45 A rated, 10 kA breaking capacity per EN 60898, C-curve, 1P+N, 18 mm wide. Current-production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"0.75 ... 35 mm²","Width":"18 mm","Height":"125 mm","Maximum":"0.75 W","Stranded":"0.75 ... 35 mm²","at 30 Cel":"45 A","at 40 Cel":"42.3 A","at 45 Cel":"40.95 A","at 50 Cel":"39.15 A","at 55 Cel":"36.45 A","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +45 °C","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","Energy limiting class":"3","Number of width units":"1","Type of fault current":"AC","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SU9","Current / at AC / rated value":"45 A","Tripping characteristic class":"C","acc. to EN 60898 / rated value":"10 kA","For Testing Equipment / Minimum":"115 V","Position / of power supply cord":"Either top or bottom","Number of poles / with protection":"1","acc. to IEC 60947-2 / rated value":"10 kA","Product feature / Touch protection":"Yes","Supply voltage frequency / rated value":"50 Hz","Tripping residual current / rated value":"30 mA","Influence of the surrounding temperature":"Max. 95% humidity","Surge current resistance / at (8/20) μs":"1 kA","Tightening torque / with screw-type terminals":"1.2 ... 2 N·m","Product function / neutral conductor switching":"No","Mechanical service life (switching cycles) / typical":"10 000"}},"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=629262&mlfb=5SU9304-1KK45","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU9304-1KK45/alternatives.json"},"ai":{"faq":[{"question":"Will 5SU9304-1KK45 drop into a panel that was specified around 5SU9304-1KK32 without rewiring?","answer":"Yes — both are 1P+N, 18 mm wide RCBOs in the same SENTRON 5SU9 family with the same C-curve and 10 kA breaking capacity. The difference is the current rating: the 5SU9304-1KK32 is a 32 A version, while this 5SU9304-1KK45 is 45 A. If the panel was wired for 32 A, swapping to 45 A requires checking the conductor sizing and upstream protection — the terminals accept the same 0.75–35 mm² range, so no rewiring of the terminals themselves is needed."},{"question":"What compliance documentation does this brand provide for 5SU9304-1KK45?","answer":"As a Siemens SENTRON product, it carries CE marking per the Low Voltage Directive and EMC Directive, plus UKCA. RoHS and REACH compliance documentation is available on request. The breaking capacity is certified to EN 60898 and IEC 60947-2."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9304-1KK45","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/5SU9304-1KK45 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}}