{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9406-1KK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9406-1KK40","canonicalUrl":"https://aoctrl.com/siemens/5SU9406-1KK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9406-1KK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9 series, RCD-operated circuit breaker, 5SU9406-1KK40, 40 A rated, C characteristic, 6 kA breaking capacity, 1P+N, 2-pole, 18 mm width.","salesMarkdown":"## What this RCBO delivers for the panel schedule The Siemens 5SU9406-1KK40 is a 1P+N RCD-operated circuit breaker (RCBO) from the SENTRON 5SU9 family, combining overcurrent and residual-current protection in a single 18 mm wide module. The 1P+N configuration protects the phase conductor and switches the neutral — the neutral pole is not protected, only switched. ## Current derating and conductor sizing At 40 °C it derates to 37.6 A, at 45 °C to 36.4 A, at 50 °C to 34.8 A, and at 55 °C to 32.4 A. ## Integration into the DIN-rail panel Width is 18 mm (1 width unit), depth 77 mm, installation depth 70 mm, height 125 mm. Supply can enter from either top or bottom, which saves wiring time when the busbar is on the opposite side. Touch protection is built in (IP20 with connected conductors in a closed distribution board). Overvoltage category III suits fixed-installation mains connection.","metaTitle":"Siemens 5SU9406-1KK40 SENTRON RCD Circuit Breaker, 40 A C-Ch","metaDescription":"Siemens 5SU9406-1KK40 SENTRON RCD-operated circuit breaker, 40 A rated, C characteristic, 6 kA breaking capacity per EN 60898/IEC 60947-2. 1P+N, 2-pole, 18 mm wide. Active producti","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":"18 mm","title":"5SU9406-1KK40","Height":"125 mm","Maximum":"0.75 W","Stranded":"0.75 ... 35 mm²","at 30 Cel":"40 A","at 40 Cel":"37.6 A","at 45 Cel":"36.4 A","at 50 Cel":"34.8 A","at 55 Cel":"32.4 A","description":"RCBO, 6 kA, 1P+N, Type AC, 100 mA, C-Char, In: 40 A, Un AC: 230 V, pigtail 600 mm, solid N","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":"40 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":"6 kA","Product feature / Touch protection":"Yes","Supply voltage frequency / rated value":"50 Hz","Tripping residual current / rated value":"100 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/53d454ac59bed268d85f00fac43a728c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629431&mlfb=5SU9406-1KK40"},"ai":{"faq":[{"question":"What is 5SU9406-1KK40's listed depth?","answer":"Depth is 77 mm, with an installation depth of 70 mm."},{"question":"What conductor sizes does 5SU9406-1KK40 accept?","answer":"Solid and stranded copper from 0.75 mm² up to 35 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9406-1KK40","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/5SU9406-1KK40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}