{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9156-7KK25","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9156-7KK25","canonicalUrl":"https://aoctrl.com/siemens/5SU9156-7KK25","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9156-7KK25","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 series, RCD-operated circuit breaker, 1P+N, 25 A, Type A, C characteristic, 6 kA (EN 60898) / 10 kA (IEC 60947-2), 2 width units.","salesMarkdown":"The Siemens 5SU9156-7KK25 is a SENTRON RCD-operated circuit breaker — an RCBO combining overcurrent protection and residual current detection in a single 36 mm wide (2 width units) package. The Type A fault-current detection catches pulsating DC residual currents, which standard AC-only RCDs miss — relevant for circuits feeding electronics, VFDs, or switching power supplies. The higher IEC rating applies when the device is used as a distribution circuit breaker per that standard; the EN rating governs domestic or similar installations. Overvoltage category III means it's rated for fixed-installation downstream of the utility meter, not for socket-outlet or equipment-level protection. ## Thermal derating and conductor sizing At 40 °C it derates to 23.5 A; at 45 °C to 22.75 A; at 50 °C to 21.75 A; at 55 °C to 20.25 A. If the panel internal ambient runs above 30 °C — common in a crowded enclosure — the load current must be reduced accordingly. The operating ambient range is -25 to +45 °C, so the 45 °C derating figure is the maximum continuous current at the top of the rated ambient band. That covers everything from a 1.5 mm² lighting circuit up to a 10 mm² feeder. The installation depth is 70 mm, with an overall depth of 77 mm including the front projection.","metaTitle":"Siemens 5SU9156-7KK25 SENTRON RCD Circuit Breaker, 25 A, Typ","metaDescription":"Siemens 5SU9156-7KK25 SENTRON RCD-operated circuit breaker, 25 A rated, Type A, 6 kA per EN 60898, 10 kA per IEC 60947-2. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","Height":"90 mm","Maximum":"1.5 W","Stranded":"0.75 ... 35 mm²","at 30 Cel":"25 A","at 40 Cel":"23.5 A","at 45 Cel":"22.75 A","at 50 Cel":"21.75 A","at 55 Cel":"20.25 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":"2","Type of fault current":"A","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":"25 A","Tripping characteristic class":"C","acc. to EN 60898 / rated value":"6 kA","For Testing Equipment / Minimum":"125 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":"10 mA","Influence of the surrounding temperature":"Max. 95% humidity","Surge current resistance / at (8/20) μs":"1 kA","Tightening torque / with screw-type terminals":"2.5 ... 3 N·m","Product function / neutral conductor switching":"Yes","Mechanical service life (switching 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=629235&mlfb=5SU9156-7KK25","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU9156-7KK25/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SU9156-7KK25?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the difference between 5SU9156-7KK25 and 5SL6563-7BB?","answer":"The 5SL6563-7BB is a standard MCB without residual current protection. The 5SU9156-7KK25 is an RCBO combining overcurrent and Type A RCD protection in one unit. They are not drop-in replacements; the 5SU9156-7KK25 requires the neutral connection for the RCD function."},{"question":"What compliance documentation does Siemens provide for 5SU9156-7KK25?","answer":"The device is designed per EN 60898 (6 kA) and IEC 60947-2 (10 kA). It carries overvoltage category III rating and touch protection. Specific RoHS, REACH, and UL documentation should be requested at quote time as the evidence does not list those certifications directly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9156-7KK25","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/5SU9156-7KK25 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}}