{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU9156-7KK40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU9156-7KK40","canonicalUrl":"https://aoctrl.com/siemens/5SU9156-7KK40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU9156-7KK40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU9156-7KK40, RCBO, 2-pole, 40 A, 10 mA, Type A, tripping characteristic C, 6 kA per EN 60898, 2 MW.","salesMarkdown":"It carries a 40 A rated current at 30 °C with a 10 mA residual-current trip threshold, Type A (pulsating DC and AC sensitive). This is the instantaneous version — no intentional time delay on the RCD side. The 10 mA trip threshold is the key differentiator here — this is not a standard 30 mA RCD. A 10 mA device is specified for circuits where even a small leakage current presents a shock hazard or equipment risk: medical locations, wet areas, or sensitive electronic loads. Type A sensitivity means it catches both sinusoidal AC faults and pulsating DC faults, which covers most modern single-phase rectified loads (switched-mode power supplies, LED drivers, variable-speed drives on single-phase). Temperature derating is published: 40 A at 30 °C, 37.6 A at 40 °C, 36.4 A at 45 °C, 34.8 A at 50 °C, 32.4 A at 55 °C. The ambient range is -40 to 75 °C, so it handles cold storage and hot panel environments alike. For industrial panels with higher fault current, verify coordination upstream.","metaTitle":"Siemens 5SU9156-7KK40 SENTRON RCBO, 40 A, 10 mA, Type A, 2-p","metaDescription":"Siemens 5SU9156-7KK40 SENTRON RCBO, 40 A rated, 10 mA residual current, Type A, 2-pole, 6 kA breaking capacity. Active production. 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","Width":"36 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Operating Frequency":"50/60 Hz","Product Designation":"RCD-operated circuit breaker","at AC / rated value":"40 A","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Instantaneous","Residual Current Type":"A","Energy Limitation Class":"3","Weight / With Packaging":"280 g","according to EN 61346-2":"F","at 30 °C / rated value":"40 A","at 40 °C / rated value":"37.6 A","at 45 °C / rated value":"36.4 A","at 50 °C / rated value":"34.8 A","at 55 °C / rated value":"32.4 A","according to IEC 81346-2":"F","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","For Testing Equipment / Minimum":"125 V","Position / Of Power Supply Cord":"Either top or bottom","Number Of Poles / With Protection":"1","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"6 kA","Tripping Fault Current / Rated Value":"10 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","Influence Of The Surrounding Temperature":"Max. 95% humidity","Surge Current Resistance / At (8/20) μS":"1 kA","Type Of Voltage / Of The Operating Voltage":"AC","Product Component / 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=629237&mlfb=5SU9156-7KK40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU9156-7KK40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SU9156-7KK40 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time, no stock figures listed here."},{"question":"What is the 10 mA trip threshold used for?","answer":"A 10 mA RCD is specified for circuits requiring enhanced shock protection — medical locations, wet areas, or sensitive electronic loads where even small leakage is unacceptable. Type A detects both AC and pulsating DC faults."},{"question":"What compliance documentation is available for 5SU9156-7KK40?","answer":"The part is designed to EN 60898 (breaking capacity 6 kA) and carries overvoltage category III, pollution degree 2 ratings. As a Siemens SENTRON product, standard RoHS and CE declarations apply — request specific documentation with your RFQ."},{"question":"Will 5SU9156-7KK40 drop into a panel specified around 5SL6550-7BB?","answer":"Not directly — the 5SL6550-7BB is a different class (MCB only, no RCD). The 5SU9156-7KK40 is an RCBO combining overcurrent and residual-current protection in one unit. It occupies the same 2-module width but serves a different protection function. If the panel was designed for a separate MCB and RCD, this combined unit changes the wiring topology."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU9156-7KK40","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/5SU9156-7KK40 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}}