{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM2643-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM2643-0","canonicalUrl":"https://aoctrl.com/siemens/5SM2643-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM2643-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM2643-0 RCD-unit, 4-pole, type AC, rated current 40 A, rated fault current 300 mA, instantaneous, 400 V AC.","salesMarkdown":"It's a type AC, instantaneous-trip device rated at 40 A with a 300 mA fault current threshold, intended for 400 V AC systems. The 40 A rating holds at 40 °C ambient (37.2 A), and derates progressively to 32 A at 70 °C. The operating range is -5 °C to 45 °C, with storage extremes of -40 °C to 75 °C. The 70 mm installation depth matches standard distribution board cutouts. Not sealable, so it's intended for indoor, enclosed panels — not washdown or outdoor exposure.","metaTitle":"Siemens 5SM2643-0 SENTRON RCD, 4-Pole, 40 A, 300 mA, Type AC","metaDescription":"Siemens 5SM2643-0 SENTRON RCD unit, 4-pole, 40 A rated current, 300 mA trip, type AC. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"70 mm","Width":"123 mm","title":"5SM2643-0","Height":"90 mm","Maximum":"45 °C","Minimum":"-5 °C","Sealable":"No","description":"RC unit for 5SL4, 4-pole, type AC, In: 40 A, 300 mA, Un AC: 400 V","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"REG","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","Product Designation":"RCD-unit","at AC / rated value":"40 A","Overvoltage Category":"III","Design Of The Product":"instantaneou","Residual Current Type":"AC","at 40 °C / rated value":"37.2 A","at 45 °C / rated value":"37.2 A","at 50 °C / rated value":"36 A","at 55 °C / rated value":"34.8 A","at 60 °C / rated value":"34 A","at 65 °C / rated value":"33.2 A","at 70 °C / rated value":"32 A","OFF-delay time adjustable":"No","Number Of Modular Width Units":"3","Rated Fault Current Adjustable":"No","Protection Function / False Tripping":"Yes","Tripping Fault Current / Rated Value":"300 mA","insulation voltage (Ui) / rated value":"460 V","Surge Voltage Resistance / Rated Value":"4 000 V","Supply Voltage / For Testing Equipment / Minimum":"195 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$21.59","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/da4e2ae434f2b945ce966b0b8968de2b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=456780&mlfb=5SM2643-0"},"ai":{"faq":[{"question":"What is the 5SM2643-0 used for?","answer":"It's a residual current device (RCD) for 400 V AC, 4-pole circuits, rated 40 A with a 300 mA trip threshold. Type AC means it detects sinusoidal AC fault currents only. It's designed as an RC unit paired with 5SL4 series MCBs for combined overcurrent and earth-fault protection in distribution boards."},{"question":"What are the key ratings of the 5SM2643-0?","answer":"Rated current 40 A AC, rated fault current 300 mA, insulation voltage 460 V, surge voltage resistance 4000 V. Thermal derating applies above 40 °C: 37.2 A at 45 °C, down to 32 A at 70 °C. Mechanical service life is 10,000 switching cycles typical."},{"question":"Where can I buy the 5SM2643-0?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the latest position."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM2643-0","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/5SM2643-0 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}}